LED Drivers for LCD Backlights
White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type)
BD6150MUV
No.11040EBT06
●Description BD6150MUV is white LED driver IC with PWM step-up DC/DC converter that can boost max 40V and current driver that can drive max 30mA. The wide and precision brightness can be controlled by external PWM pulse. BD6150MUV has very accurate current drivers, and it has few current errors between each strings. So, it will be helpful to reduce brightness spots on the LCD. Small package type is suited for saving space. ●Features 1) High efficiency PWM step-up DC/DC converter (fsw=1.25MHz / 0.75MHz) 2) High accuracy & good matching current drivers (MAX30mA/ch) 3) Integrated 50V power Nch MOSFET 4) Soft start 5) Drive up to 10 in series 6strings in parallel 6) Wide input voltage range (4.2V ~ 26V) 7) Rich safety functions ・Over-voltage protection ・Over current limit ・LED terminal open/short protect ・External SBD open detect / Output short protection ・UVLO ・Thermal shutdown 8) Small & thin package (VQFN024V4040) 4.0 × 4.0 × 1.0mm ●Applications All middle size LCD equipments backlight of Notebook PC, portable DVD player, car navigation systems, etc. ●Absolute maximum ratings (Ta=25℃) Parameter Maximum applied voltage 1 Maximum applied voltage 2 Maximum applied voltage 3 Maximum applied voltage 4 Power dissipation 1 Power dissipation 2 Power dissipation 3 Operating temperature range Storage temperature range
*1 *2 *3
Symbol VMAX1 VMAX2 VMAX3 VMAX4 Pd1 Pd2 Pd3 Topr Tstg
Ratings 7 25 30.5 41 500 *1 780 *2 1510 *3 -40 ~ +85 -55 ~ +150
Unit V V V V mW mW mW ℃ ℃
Condition VREG, ISET, PWMDRV, FSEL, OCPSET, VDET, TEST LED1, LED2, LED3, LED4, LED5, LED6 VBAT, FAILFLAG, PWMPOW SW
Reduced 4.0mW/℃ With Ta>25℃ when not mounted on a heat radiation Board. 1 layer (ROHM Standard board) has been mounted. Copper foil area 0mm2, When it’s used by more than Ta=25℃, it’s reduced by 6.2mW/℃. 4 layer (JEDEC Compliant board) has been mounted. Copper foil area 1layer 6.28mm2, Copper foil area 2~4layers 5655.04mm2, When it’s used by more than Ta=25℃, it’s reduced by 12.1mW/℃.
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1/28
2011.06 - Rev.B
BD6150MUV
●Recommended operating range (Ta=-40℃ ~ +85℃) Parameter Power supply voltage Symbol VBAT Limits Min. 4.2 Typ. 12.0 Max. 26.0 Unit V
Technical Note
Condition
●Electrical characteristic (Unless otherwise specified, VBAT=12V, Ta = +25℃) Limits Parameter Symbol Min. Typ. Max. Quiescent current Current consumption [PWMPOW Terminal] Low input voltage range1 High input voltage range1 Pull down resistor1 [PWMDRV Terminal] Low input voltage range2 High input voltage range2 Pull down resistor2 [FSEL Terminal] Low input voltage range3 High input voltage range3 Pull down resistor3 [FAILFLAG] Input resistor Off current [Regulator] VREG voltage Under voltage lock out [Switching Regulator] LED control voltage Switching frequency Duty cycle limit SW Nch FET RON [Protection] Over current limit OCPSET open protect Over voltage limit Input SBD open protect VDET leak current [Current driver] LED maximum current LED current accuracy LED current matching LED current limiter ILMAX ILACCU ILMAT ILOCP 10.0 0.5 0 11.5 0.6 30 ±3.0 ±1.5 0.1 13.0 0.7 Ocp OOP Ovl Sop OVIL 1.4 0.96 0.02 2.0 0.0 1.00 0.05 0.1 2.6 0.1 1.04 0.08 1.0 VLED fsw Duty RON 0.56 1.00 91 0.70 1.25 95.0 0.48 0.84 1.50 99.0 0.58 VREG UVLO 4.2 3.3 5.0 3.7 6.0 4.1 FFIR FFIST 1.0 2.0 0.1 3.0 2.0 FSL FSH FSR 0 2.1 100 300 0.9 6.0 500 PDRVL PDRVH DRVR 0 2.1 100 300 0.9 5.5 500 POWL POWH POWR 0 2.1 100 300 0.9 VBAT 500 Iq Idd 1.6 3.2 4.4 4.8
Unit µA mA V V kΩ V V kΩ V V kΩ kΩ µA V V V MHz % Ω A A V V µA mA % % mA V V FSEL=1V
Condition PWMPOW=0V VDET=0V,ISET=22kΩ
PWMPOW=3V
FAILFLAG=2.5V PWMPOW=0V No load VBAT falling edge
FSEL=L (GND short) LED1-6=0.3V ISW=80mA
*1
OCPSET=68kΩ
OCPSET=2MΩ Detect voltage of VDET pin Detect voltage of VDET pin
ILED=16~20mA Each LED current/Average (LED1-6) ILED=16~20mA Current limit value at ISET resistor 1kΩ setting PWMDRV=2.5V
LED terminal Over voltage protect LEDOVP ISET voltage
*1
Iset
This parameter is tested with DC measurement.
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2/28
2011.06 - Rev.B
BD6150MUV
●Reference Data
30 25 20 ICC [uA] 15 10 5 4 3.5 5.3 5.2
Technical Note
85℃ 25℃
ICC [mA]
3 2.5 2 1.5 1
85℃ 25℃ -40℃
VREG [V] 5.1 5 4.9 4.8 -40
22V 6V
12V
-40℃
0 0 5 10 15 20 25 30 VBAT [V]
0.5 0 0 5 10 15 VBAT [V] 20 25 30 -20 0 20 40 60 80 100
TEMP [℃]
Fig 1. Quiescent Current
Fig 2. Current Consumption
Fig 3. VREG Voltage
3.9
620
1500 1400
RISING
3.8 3.7
6V
FREQ [kHz] 610 ISET [mV]
5V
1300 1200
6V
UVLO (V)
3.6 3.5
600
FALLING
3.4 -40 -20 0 20 40 60 80 100
4.2V
590 -40
5V
4.2V
1100 1000 -40
-20
0
20
40
60
80
100
-20
0
TEMP (°C)
TEMP [°C]
20 40 TEMP [℃]
60
80
100
Fig 4. Under Voltage Lock Out
Fig 5. ISET Voltage
Fig 6. Switching Frequency
98 97 96 RON [m Ω] 95 94 93 92 -40
900
2.6
4.2V
5V
800 700 600 500 400 300 200 100
85℃
SW_ICOIL [A]
2.4 2.2 2 1.8 1.6 1.4 -40
6V
Max Duty [%]
6V
4.2V 5V
-40℃
25℃
-20
0
20
40
60
80
100
0 2.4
3
3.6 4.2 4.8 5.4 VREG [V]
6
6.6 7.2
-20
0
20
40
60
80
100
TEMP [℃]
TEMP [°C]
Fig 7. Max Duty
Fig 8. LX NcH RON
Fig 9. Over Current Limit
1.2
70
1
4.2V, 5V, 6V
1.1 VDET [V]
0.9 0.8 0.7 VDET [ µ A] 0.6 0.5 0.4 0.3 0.2 0.1 0 -40
5V, 6V
VDET[mV]
60
1
50
0.9
4.2V
40
VBAT=VREG=5V
0.8 -40
-20
0
20
40
60
80
100
30 -40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
TEMP [°C]
TEMP [℃ ]
TEMP [°C]
Fig 10. Over Voltage Protect
Fig 11. SBD Open Protect
Fig 12. VDET Leak Current
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3/28
2011.06 - Rev.B
BD6150MUV
Technical Note
50
20 18
-40℃ 85℃ 25℃
Matching [%]
3 2 1 0 -1 -2 -3
45 ILED Max [mA]
-40℃
ILED [mA]
16 14 12 10 8 6 4
-40℃
25℃
40
35
85℃
25℃
30 3 4 5
85℃
6 7
2 0 0 0.2 0.4 0.6 0.8 1
0
20
40
60
80
100
VBAT [V]
VLED [V]
Duty [%]
Fig 13. LED Max Current
Fig 14. LED Current vs LED Voltage
Fig 15. LED Current Matching
100
100
-40℃
90 Efficiency [%] 80 70 60 50 40 0 10 VBAT [V] 20 30
0.1 1 10 Duty [%] 100 10
6V
ILED [mA]
25℃
85℃
12V, 26V
1
Fig 16. Efficiency 10LEDx6CH
Fig 17. LED Current vs PWM Duty PWM Freq=200Hz LED 10x6CH
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4/28
2011.06 - Rev.B
BD6150MUV
●Block diagram
VBAT VREG FAILFLAG
Technical Note
SBD OPEN/ Output short PROTECT
VDET
REG TSD
PWMPOW
UVLO
Internal Reset
Output Over Voltage PROTECT
5.5V Clamp
Internal Power Supply
FAULT DETECTOR LED TERMINAL OPEN/SHORT DETECTOR
ERRAMP PWM COMP + LED1
SW SW
Internal Power Control
Soft start
Control SENCE
LED RETURN
LED2 LED3 LED4 LED5 LED6
OSC
Current SENCE Over Current Protect
+
SELECT
6ch PGND + -
ISET Resistor driver
Current Driver
N.C. N.C. N.C.
OCPSET
TEST
FSEL
GND
PWMDRV
ISET
GND
Fig.18 BD6150MUV block diagram
●Application example
Battery or adapter 4.2V to 26V
4.7µH 2.2µF / 50V
FAILFLAG VREG VBAT SW SW
10LED× 6 parallel
1µF VDET 10kΩ
2.2µF
PGND
1MΩ
Vin=2.1V to 5.5V f PWM =100Hz~ 1kHz
26.7kΩ
PWM
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET
PGND
68kΩ
N.C. LED1
BD6150MUV
LED2 LED3 LED4 LED5
ISET
GND
GND
LED6 N.C.
22kΩ
19.6mA
Fig.19 Application example (10LED × 6parallel, Switching frequency 750kHz)
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5/28
2011.06 - Rev.B
BD6150MUV
●Pin assignment table PIN PIN Name No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 SW SW N.C. PGND FAILFLAG OCPSET VDET TEST FSEL ISET GND N.C. LED1 LED2 LED3 LED4 LED5 LED6 N.C. GND PWMDRV VREG PWMPOW VBAT
Technical Note
In/ Out Out Out Out In In In In In In In In In In In In In In Out In In
Function Switching Tr drive terminal Switching Tr drive terminal No connect pin PGND for switching Tr Fail Flag Current Limiter setting Detect input for SBD open and OVP TEST signal Selection of Frequency, ‘L’: 1.25MHz, ‘H’: 0.75MHz Resister connection for LED current setting GND for Switching Regulator No connect pin Current sink for LED Current sink for LED Current sink for LED Current sink for LED Current sink for LED Current sink for LED No connect pin GND for Current driver PWM input pin for power ON/OFF only driver Regulator output / Internal power-supply PWM input pin for power ON/OFF Battery input
Terminal diagram H H F D C A A J J A B F C C C C C C F B G D E I
VBAT
VREG
VBAT
VBAT
PIN
PIN
PIN
PIN
GND
PGND
GND
GND
A
B
C
D
VBAT
VBAT
PIN 5.5V Clump GND
PIN
PIN
PIN
GND
PGND
E
F
G
H
VBAT
VREG
PIN
PIN
GND
PGND
GND
I
J
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6/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●Description of Functions 1) PWM current mode DC/DC converter While this IC is power ON, the lowest voltage of LED terms is detected, PWM duty is decided to be 0.7V and output voltage is kept invariably. As for the inputs of the PWM comparator as the feature of the PWM current mode, one is overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal that controls the inductor current into Slope waveform to prevent sub harmonic oscillation. This output controls internal Nch Tr via the RS latch. In the period where internal Nch Tr gate is ON, energy is accumulated in the external inductor, and in the period where internal Nch Tr gate is OFF, energy is transferred to the output capacitor via external SBD. This IC has many safety functions, and their detection signals stop switching operation at once. 2) Soft start This IC has soft start function. The soft start function prevents large coil current. Rush current at turning on is prevented by the soft start function. After PWMPOW, PWMDRV is changed L H, soft start becomes effective for within 4ms and soft start doesn't become effective even if PWMPOW is changed L H after that. And, when the H section of PWMPOW is within 4ms, soft start becomes invalid when PWMPOW is input to H more than three times. The invalid of the soft start can be canceled by making PWMPOW, PWMDRV L.
PWMDRV PWMPOW
PWMPOW VREG Soft start
OFF ON OFF OFF
VREG
Max 1ms Max 3ms
Soft start Soft start reset
OFF
ON
OFF
ON
OFF
OFF
ON
OFF Reset Reset
OFF
Fig.20 Soft start 3)
Fig.21 Soft start reset and set
FAILFLAG When the error condition occurs, boost operating is stopped by the protection function, and the error condition is outputted from FAILFLAG. After power ON, when the protection function is operating under about 1ms have passed. Object of protect function is as shown below. ・Over-voltage protection ・External SBD open detect/ Output Short protection ・LED terminal open/short protection ・Over current limit
PWMPOW FAILFLAG Protection function Boost operating
about 1ms
un-detection off normal
detect boost stop normal
un-detection off normal
Fig.22 FAILFLAG operating description
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7/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●Protection ・Over voltage protection At such an error of output open as the output DC/DC and the LED is not connected to IC, the DC/DC will boost too much and the VDET terminal exceed the absolute maximum ratings, and may destruct the IC. Therefore, when VDET becomes sensing voltage or higher, the over voltage limit works, and turns off the output Tr, and the pressure up made stop. At this moment, the IC changes from activation into non-activation, and the output voltage goes down slowly. And, when the Feedback of LED1 isn’t returned, so that Vout will return normal voltage.
Vout LED1 voltage LED1 connection normal LED2 connection LED1 FeedBack PWMPOW, PWMDRV
Fig.23 VDET operating description ・External SBD open detect / Output short protection In the case of external SBD is not connected to IC, or VOUT is shorted to GND, the coil or internal Tr may be destructed. Therefore, at such an error as VDET becoming 0.05V or below, and turns off the output Tr, and prevents the coil and the IC from being destructed. And the IC changes from activation into non-activation, and current does not flow to the coil (0mA). ・Thermal shut down This IC has thermal shut down function. The thermal shut down works at 175℃ or higher, and the IC changes from activation into non-activation.
open normal
return
off
return
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8/28
2011.06 - Rev.B
BD6150MUV
●How to set over voltage limit
Technical Note
This section is especially mentioned here because the spec shown electrical characteristic is necessary to explain this section. Over voltage limit LED control voltage LED terminal over voltage protect 1. 2. min 0.96V typ 1.00V max 1.04V min 0.56V typ 0.70V max 0.84V min 10.0V typ 11.5 V max 13.0V
Calculate the conditions that the total value of LED VF is MAX. Example) In the case of serial 8 LEDs with VF=2.9V(min), 3.2V(typ), 3.5V(max) => 3.5V x 8=28V Then calculate the biggest value of output with the following formula. The biggest value of output = the biggest value calculated for 1 + the biggest value of LED terminal voltage. (0.84V) Example) The biggest value of output = 28V + 0.84V =28.84V Set the smallest value of over voltage larger than the biggest value of output. If over voltage is closer to the total value of VF, it could be occurred to detect over voltage by ripple, noise, and so on. It is recommended that some margins should be left on the difference between over voltage and the total value of VF. This time around 6% margin is placed. Example) Against the biggest value of output = 28.84V, the smallest value of over voltage = 28.84V x 1.06 = 30.57V Ic over voltage limit min=0.96V,typ=1.00V, max=1.04V typ = 30.57V×(1.00V/0.96V) = 31.8V max = 31.8V×(1.04V/1.00V) = 33.1V The below shows how to control resistor setting over voltage Please fix resistor 2.2MΩ between VDET and output and then set over voltage after changing resistor between VDET and GND. While PWM is off, output voltage decreases by minimizing this resistor. Due to the decrease of output voltage, ripple of output voltage increases, and singing of output condenser also becomes bigger. Example) Selecting OVP resistor. (Example 1) VF=3.6V max, serial = 7 LED OVP = 1.0V, R1 = 2.2MΩ, R2 = 78.7kΩ VOUT VOUT = 1.0 × (2.2MΩ + 78.7kΩ)/ 78.7kΩ = 28.95V (Example 2) VF=3.6V max, serial = 8 LED OVP = 1.0V, R1 = 2.2MΩ, R2 = 69.8kΩ R1 VOUT = 1.0 × (2.2MΩ + 69.8kΩ)/ 69.8kΩ = 32.52 (Example 3) VF=3.6V max, serial = 9 LED VDET OVP = 1.0V, R1 = 2.2MΩ, R2 = 62kΩ R2 VOUT = 1.0 × (2.2MΩ + 62kΩ)/ 62kΩ = 36.48V (Example 4) VF=3.6V max, serial = 10 LED OVP = 1.0V, R1 = 1.0MΩ, R2 = 26.7kΩ VOUT = 1.0 × (1.0MΩ + 26.7kΩ)/ 26.7kΩ = 38.45V The following shows how to confirm if LEDs are not turned on while selecting terminals. If the difference between the VF’s total value of LED and over voltage is less than min.10V of LED terminal over voltage protect, LEDs should be turned on. LEDs are turned on, as the following formula shows; 33.1V-2.9V x 8 serial = 9.9V Ton peak current = (VIN / L) ×Ton (Example 1) In case of, VIN=6.0V, L=4.7µH, fsw=1.25MHz, VOUT=39V, IOUT=80mA, Efficiency=85% Ipeak = (6.0V / 4.7µH) × (1 / 1.25MHz) × (1-(6.0V / 39V)) =0.86A Iave = (39V × 80mA / 6.0V) / 85% = 0.61A 1/2 Ton = (0.61A × (1-6.0V / 39V) × (1 / 1.25MHz) × (4.7µH /6.0V) × 2) = 0.81µs (1-VIN/VOUT) × (1/fsw)=0.68µs < Ton Peak current = 0.68A/2+0.61A = 1.04A (Example 2) In case of, VIN=12.0V, L=4.7µH, fsw=1.25MHz, VOUT=39V, IOUT=80mA, Efficiency=85% Ipeak = (12.0V / 4.7µH) × (1 / 1.25MHz) × (1-(12V / 39V)) =1.41A Iave = (39V × 80mA / 12.0V) / 85% = 0.31A Ton = (0.31A × (1-12 V / 39V) × (1 / 1.25MHz) × (4.7µH /12V) × 2)1/2 = 0.36µs (1-VIN/VOUT) × (1/fsw)=0.55µs > Ton Peak current = 12V/4.7µH × 0.36µs = 0.92A * When too large current is set, output overshoot is caused, be careful enough because it is led to break down of the IC in case of the worst.
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10/28
2011.06 - Rev.B
BD6150MUV
Technical Note
・soft start of Over current limit for application When the capacitor of OCPSET is set as figure, over current limit can become setting value slowly. This effect is same as internal soft start. When you want to reduce peak current than internal soft start on start up, this way is effective. But, this action repeat when the timing that PWMPOW change L to H, so to do PWM control with PWMPOW terminal, rise time of over current limit must be set into Hi time of PWM control, and please don’t connect the capacitor. Show example of rising wave form with OCPSET 330pF.
PWMPOW VOUT
Current Sence
+ -
Detect
OCPSET
OCPSET
R(OCPSET)
36m Coil current 1.5A
Fig.25
Rising wave form with VBAT=5V, 6parallel 10serial 20mA/ch, OCPSET=68kΩ,330pF
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11/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●Operating of the application deficiency 1) When 1 LED or 1string OPEN during the operating The LED string that became OPEN isn't lighting, but other LED strings are lighting. Then LED terminal is 0V, output boosts up to the over voltage protection voltage. When over voltage is detected, the feedback of open string isn’t returned, so that VOUT will return normal voltage. In the case that the voltage of 2 LED terminals becomes more than 25V(Absolute maximum ratings) as VOUT boosts up to the over voltage protection voltage, please pay attention carefully that 2 LED terminals could be broken up in setting over voltage protection.
OVP setting when selecting terminals
Over voltage protection voltage 40 35 30 25 20 15 10 5 0 10 20 30 40 LED Vf (Vout) Setting range of over voltage protection
Vout LED1 voltage LED2 voltage LED 1 connection normal open normal return off return
LED1 LED2
LED connection LED 1 feedback PWMPOW, PWMDRV LED 1current LED 2 current 20mA
0mA 20mA
Fig.26 LED OPEN detect Moreover, excessively high level of over voltage limit in terminal setting makes it happen that LED terminal voltage exceeds LED terminal over voltage protect, which accordingly turn off LED lights. In order to prevent this problem, please see “How to set the external resistor of over voltage limit (p.7)” and then set over voltage referring to application. 2) When LED short-circuited in the plural All LED strings is turned on unless LED1~6 terminal voltage is more than 11.5V. When it was more than 11.5V only the strings which short-circuited is turned off normally and LED current of other lines continue to turn on.
LED short-circuited
LED short
LED terminal voltage 40 35 30 25 20 15 10 5 0 10
LED1 12.7V
0.7V
Voltage range of LED short-circuited
LED2 Vout
LED 1 LED 2
20 30 40 LED Vf (Vout)
I LED1 I LED2 LED 1 FeedBack
20mA 20mA normal
0mA
cut
Fig.27 LED short detect 3) When Schottky diode comes off IC and a switching transistor aren't destroyed because boost operating stops by the Schottky diode coming off protected function. When the resistor of over current detection comes off All the LEDs do not turn on due to open protect of the OVP resistor, which stops boost operation and consequently prevents passing LED current.
4)
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12/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●How to activate Please pay attention to the following when activating. 1. The lights are turned off by LED terminal over voltage protection in the case that LED terminal voltage is more than 11.5V(typ) at PWMDRV=H. LED terminal becomes more than 11.5V depending on OVP setting. In that case, please refer to how to set on P7. 2. In the case that capacitors are placed between anode and casode, LED terminal might become more than 11.5V depending on power supply activating time. Please make t12 in Fig.28 long enough until LED terminal becomes less than 11.5V. or use application. 3. If PWMPOW and PWMDRV terminal voltage become more than VBAT voltage in the case that activation of power supply voltage (VBAT) is not completely finished, error might be occurred by supplying power supply into VBAT via ESD protection diode on the VBAT side of each terminal. Fig.28 shows input timing of VBAT, PWMPOW, and PWMDRV. Please input signal paying attention to the above. In the case that conditions are not good enough, it happens that lights are turned off at activation. Terminal select circuit inside IC operates using VREG as power supply. In the case that VREG does not activate (less than UVLO), please set PWMDRV=H t12 hours after setting PWMPOW=H. Terminal select circuit is reset by PWMDRV=L signal while VREG rises after PWMPOW=L->H. Lights might be turned off unless PWMDRV=L is input until VREG becomes stable at activation. After activation, VREG voltage is more than UVLO, reset is not needed since terminal information is saved. At light dimming of PWMDRV terminal
t1
VBAT
L[V]
H[V] t2 t3 t4 t5 t3
H[V]
PWMPOW
t6
VREG
t7 t14 t8 t9 t16 t10 t14
PWMDRV
t11 t15
At light dimming of PWMPOW terminal
t1
VBAT
L[V]
H[V] t2 t3
H[V] t4 t5 t3 t13
PWMPOW
t6 t12 t7 t14 UVLO t15 t14 t16
VREG
PWMDRV
t9 t10
Fig.28 input timing
Name Power supply activating time Power supply-PWMPOW time PWMPOW rising time PWMPOW falling time PWMPOW low time Power supply-PWMDRV time PWMDRV rising time PWMDRV high time PWMDRV falling time PWMDRV low time PWMDRV cycle PWMPOW cycle PWMPOW high time PWMPOW(H)->PWMDRV(H) time PWMPOW(L)->PWMDRV(L) time PWMDRV(L)->PWMPOW(L) time Operation Voltage Non operation voltage Unit µs µs µs µs µs µs µs µs µs µs µs µs µs µs µs µs V V Min. 100 0 0 0 50 1600 0 5 0 5 40 1000 50 1500 0 0 4.2 Typ. 5000 5000 12 Max. 100 100 100 100 10000 10000 26 4.2
t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 H L
0V
VBAT
10kΩ 5V
PIN
Rin
GND
Fig.29 Example of application at control signal voltage > VBAT voltage
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13/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●Start control (PWMPOW) and select LED current driver (PWMDRV) This IC can control the IC system by PWMPOW, and IC can power off compulsory by setting 0.9V or below. Also, It powers on PWMPOW is at more than 2.1V. After it’s selected to PWMPOW=H, When it is selected at PWMDRV=H, LED current decided with ISET resistance flow. Next, When it is selected at PWMDRV=L, LED current stop to flow. PWMPOW L H L H PWMDRV L L H H IC Off On Off On OFF OFF OFF Current decided with ISET LED current
●How to select the number of LED lines of the current driver When the number of LED lines of the current driver is reduced, the un-select can be available by setting the unnecessary LED1~6 terminals OPEN. In the case of using 4 lines and so on, please connect the unnecessary 2 lines OPEN. Then please set PWMPOW and PWMDRV “H” and finish selecting the lines within the process of softstart. If the level of over voltage limit is set too high, the connected LED lines exceed LED terminal over voltage protect and are judged as unnecessary lines. Please make it sure referring “How to set over voltage limit (p.7)”. Additionally, once the terminals are judged as unnecessary, this information never can be reset without setting PWMPOW and PWMDRV “L”. ●LED current setting range LED current can set up Normal current by resistance value (RISET) connecting to ISET voltage. Setting of each LED current is given as shown below. Normal current = 16mA(27kΩ/RISET) Also, Normal current setting range is 10mA~30mA. LED current becomes a leak current MAX 2µA at OFF setting. When using beyond current setting range, please be careful that the error in LED current setting could be large. ISET Normal current setting example RISET LED current 18kΩ (E24) 22kΩ (E24) 24kΩ (E24) 27kΩ (E24) 30kΩ (E24) 33kΩ (E24) 24.0mA 19.6mA 18.0mA 16.0mA 14.4mA 13.1mA
●Brightness control There are two dimming method is available, first method is analog dimming that apply analog voltage to ISET terminal, and second method is PWM control via digital dimming of PWMPOW or PWMDRV. Because each method has the different merit, please choose a suitable method for the application of use. Two techniques can be used as digital dimming by the PWM control One is PWM control of current driver, the other is PWM control of power control. As these two characteristics are shown in the below, selects to PWM control process comply with application. ・Efficiency emphasis in the low brightness which has an influence with the battery life 2) Power control PWM control ・LED current dispersion emphasis in the PWM brightness control 1) Current driver PWM control (Reference) Efficiency of LED current 0.5mA PWM frequency 200Hz PWM regulation process (PWM Duty=2.5%) Limit dispersion capability of low duty Current driver Power control 74.8% 91% 0.04% 0.40%
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14/28
2011.06 - Rev.B
BD6150MUV
1)
Technical Note
Current driver PWM control is controlled by providing PWM signal to PWMDRV, as it is shown Fig.30. The current set up with ISET is chosen as the H section of PWMDRV and the current is off as the L section. Therefore, the average LED current is increasing in proportion to duty cycle of PWMDRV signal. This method that it lets internal circuit and DC/DC to work, because it becomes to switch the driver, the current tolerance is a few when the PWM brightness is adjusted, so it makes it possible to brightness control until 5µs (MIN0.1% at 200Hz). And, don't use for the brightness control, because effect of ISET changeover is big under 1µs ON time and under 1µs OFF time. Typical PWM frequency is 100Hz~25kHz.
PWMDRV LED current Coil current IC’s active current ON ON ON OFF OFF OFF ON
Fig.30 PWMDRV sequence 2) Power control PWM control is controlled by providing PWM signal to PWMPOW, as it is shown Fig.31. The current setting set up with PWMDRV logic is chosen as the H section and the current is off as the L section. Therefore, the average LED current is increasing in proportion to duty cycle of PWMPOW signal. This method is, because IC can be power-off at off-time, the consumption current can be suppress, and the high efficiency can be available, so it makes it possible to brightness control until 50µs (MIN1% at 200Hz). And, don't use for the brightness control, because effect of power ON/OFF time changeover is big under 50µs ON time and under 50µs OFF time. Typical PWM frequency is 100Hz~1kHz.
PWMPOW LED current Coil current IC’s active current ON ON ON ON OFF OFF OFF OFF
Fig.31 PWMPOW sequence ●Output voltage ripple for PWM dimming Conditio： 8serial 6parallel, LED current=20mA/ch, VBAT=7V, Ta=25℃, output capacitor=2.2μF(50V/B3) PWMDRV Lower ripple Voltage (under 200mV) Output Voltage (AC) 780mA Input Current 1ms/div.
Fig.32 Output voltage ripple for PWM dimming
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15/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●LED current rise and fall for PWM dimming Conditions： 8serial 6parallel, LED current=20mA/ch, VBAT=7V, Ta=25℃, output capacitor=2.2μF(50V/B3)
PWMDRV Output Voltage 624ns
PWMDRV Output Voltage 114ns
LED Current
400ns/div.
LED Current
40ns/div.
100 10 L E D c urre nt[m A ] 1 0.1 0.01 0.001 0.1
PWMDRV(ta 25, Frequency 200Hz, LED 10x6ch) LED current vs Duty
100 10 LED current[mA]
PWMPOW (ta 25, Frequency 200Hz LED 10x6ch) LED current vs Duty
1 0.1 12V 6V 26V 0.1 1 Duty[%] 10 100
12V 6V 26V 1 duty[%] 10 100
0.01 0.001
Fig.33 PWM characteristics of current driver PWM
Fig.34 PWM characteristics of power control PWM
●Main characteristics of efficiency Conditions： 10serial 6parallel, LED current=20mA/ch, output capacitor=2.2μF(50V/B3)
100
-40℃
90 Efficiency [%] 80
85℃ 25℃
70 60
50 5 10 15 VBAT [V] Efficiency vs duty (10serial x 6strings) 100% 90% 80% 70% Efficiency Efficiency 60% 50% 40% 30% 20% 10% 0%
0 10 20 30 40 50 60 70 80 90 100
20
25
30
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%
efficiency for PWMPOW Control VBAT=12V Ta=25 ℃
0
10 20 30
40
50 60 70 80
90 100
PW M Duty[%]
PWM Duty(%)
Fig.35 Efficiency of current driver PWM
Fig.36 Efficiency of power control PWM
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16/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●The coil selection The DC/DC is designed by more than 4.7µH. When L value sets to a lower value, it is possibility that the specific sub-harmonic oscillation of current mode DC / DC will be happened. Please do not let L value to 3.3µH or below. And, L value increases, the phase margin of DC / DC becomes to zero. Please enlarge the output capacitor value when you increase L value. Example) 4.7µH = output capacitor 2.2µF/50V 1pcs 6.8µH = output capacitor 2.2µF/50V 2pcs 10µH = output capacitor 2.2µF/50V 3pcs This value is just examples, please made sure the final judgment is under an enough evaluation. ●The separation of the IC power supply and coil power supply This IC can work in separating the power source in both IC power supply and coil power supply. With this application, it can obtain that decrease of IC power consumption, and the applied voltage exceeds IC rating 26V. That application is shown in below Fig.14. The higher voltage source is applied to the power source of coil that is connected from 4.2V to 5.5V into IC VBAT, please follow the recommend design in Fig.14. It connects VBAT terminal and VREG terminal together at IC outside. When the coil power supply is applied, it is no any problem even though IC power supply is the state of 0V. Although IC power supply is set to 0V, pull-down resistance is arranged for the power off which cuts off the leak route from coil power supply in IC inside, the leak route is cut off. And, there is no power on-off sequence of coil power supply and IC power supply.
Battery or adapter
4.2V to 30V
Battery or adapter
4.2V to 26V
Battery or adapter
4.2V to 30V 10µF
Battery
4.2V to 5.5V
10µF
4.7µH 2.2µF / 50V FAILFLAG VREG VBAT SW SW
9LED × 6parallel
1µF 10kΩ VDET 2.2µF
PGND
4.7µH 2.2µF / 50V FAILFLAG VREG VBAT SW SW
9LED × 6parallel
1µF 10kΩ VDET
1µF
PGND
2.2MΩ 69.8k Ω
2.2MΩ 69.8k Ω
Vin=2.1V to 5.5V fPWM=100Hz~1kHz
Vin=2.1V to 5.5V fPWM=100Hz~1kHz
PWM
10k Ω
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
PWM
10k Ω
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 68k Ω
BD6150MUV
LED1 LED2 LED3 LED4 LED5
68k Ω
GND
GND
GND
GND
ISET
ISET
LED6 N.C. 27kΩ
LED6 N.C. 27kΩ
16mA
16mA
Fig.37 Application at the time of power supply isolation (6parallel)
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17/28
2011.06 - Rev.B
BD6150MUV
●Selection of external parts Recommended external parts are as shown below. When to use other parts than these, select the following equivalent parts. ・Coil Value 4.7μH 4.7μH 4.7μH 10μH 10μH ・Capacitor Value Pressure Manufacturer Product number Vertical 1.6 3.2 2.0 3.2 2.0 1.6 2.0 3.2 2.0 3.2 3.2 2.0 Size Horizontal 0.8 1.6 1.25 1.6 1.25 0.8 1.25 1.6 1.25 2.5 1.6 1.25 Size Horizontal 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 Size Horizontal 1.6 Height 0.8±0.1 0.85±0.1 1.25±0.1 1.6±0.2 0.85±0.15 0.8±0.1 0.85±0.1 1.15±0.1 1.25±0.1 2.0±0.2 1.6±0.2 0.85±0.1 Manufacturer TOKO TOKO TDK TOKO TDK Product number A915AY-4R7M B1015AS-4R7M LTF5022T-4R7N2R0-LC A915AY-100M LTF5022T-100M1R4-LC Vertical 5.2 8.4 5.0 5.2 5.0 Size Horizontal 5.2 8.3 5.2 5.2 5.2 Height (MAX) 3.0 4.0 2.2 3.0 2.2
Technical Note
DC current (mA) 1870 3300 2000 1870 1400 TC
DCR (Ω) 0.045 0.038 0.073 0.090 0.140 Capa Tolerance +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10%
[ Supply voltage capacitor ] 2.2μF 4.7μF 4.7μF 10μF 10μF 1μF 4.7μF 1μF 1μF 2.2μF 2.2μF 0.33μF ・Resistor Value 10kΩ 15kΩ 18kΩ 22kΩ 24kΩ 27kΩ 30kΩ 33kΩ 56kΩ 62kΩ 68kΩ 75kΩ 2.2MΩ ・SBD Pressure 60V Manufacturer ROHM Product number RB160M-60 Vertical 3.5 Height 0.8 Tolerance Manufacturer ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ±0.5% ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Product number MCR03EZPD1002 MCR03EZPD1502 MCR03EZPD1802 MCR03EZPD2202 MCR03EZPD2402 MCR03EZPD2702 MCR03EZPD3002 MCR03EZPD3302 MCR03EZPD5602 MCR03EZPD6202 MCR03EZPD6802 MCR03EZPD7502 MCR03EZPD2204 Vertical 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 Height 0.45 0.45 0.45 0.45 0.45 0.45 0.45 0.45 0.45 0.45 0.45 0.45 0.45 10V 25V 25V 25V 10V 10V 10V 50V 50V 50V 50V 50V MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA TDK MURATA MURATA GRM188B31A225K GRM319R61E475K GRM21BR61E475K GRM31CB31E106K GRM219R61A106K GRM188B10J105K GRM219B31A475K GRM31MB31H105K GRM21BB31H105K C3225JB1H225K GRM31CB31H225K GRM219B31H334K B X5R X5R B X5R B B B B B B B
[ Smoothing capacitor for built-in regulator ]
[ Output capacitor ]
The coil is the part that is most influential to efficiency. Select the coil whose direct current resistor (DCR) and current inductance characteristic is excellent. BD6xxx is designed for the inductance value of 4.7µH. Don’t use the inductance value. less than 3.3μH. Select a capacitor of ceramic type with excellent frequency and temperature characteristics. Further, select Capacitor to be used with small direct current resistance, and pay sufficient attention to the PCB layout.
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18/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●PCB Layout In order to make the most of the performance of this IC, its PCB layout is very important. Characteristics such as efficiency and ripple and the likes change greatly with layout patterns, which please note carefully.
Battery or adapter
4.2V to 26V CVL1 10µF 4.7µH 2.2µF / 50V CO1 VREG FAILFLAG SW SW VBAT
10LED × 6parallel
1µF CVB1 10kΩ RVT 1MΩ
2.2µF CVR3
PGND
Vin=2.1V to 5.5V fPWM=100Hz~1kHz
VDET
26.7k Ω
PWM
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND GND GND
RVD N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5
ISET
68kΩ ROC
LED6 N.C. 22kΩ RISET
19.6mA
Fig. 38 PCB Layout
Connect input capacitor CVL1 (10μF) as close as possible between coil L1 and PGND. Put input bypath capacitor CVB1 (1μF) as close as possible between VBAT and PGND pin. Connect smoothing capacitor CVR3(2.2μF) as close as possible between VREG pin and PGND. Connect schottky barrier diode SBD as close as possible between coil1and SW pin. Connect output capacitor CO1 between cathode of SBD and PGND. Make both PGND sides of CVL1 and CO1 as close as possible. > Connect LED current setting resistor RISET(22kΩ) as close as possible between ISET pin and GND. There is possibility to oscillate when capacity is added to ISET terminal, so pay attention that capacity isn't added. Connect Over current limit setting resistor ROC(68kΩ) as close as possible between OCPSET pin and GND. < Over current limit setting resistor RVT(2.2MΩ) & RVD(56kΩ)> Put over current limit setting resistor RVT(2.2MΩ) & RVD(56kΩ) as close as possible VDET pin so as not to make the wire longer, which possibly causes the noise and also detects over voltage protection by mistake. GND is analog ground, and PGND is power ground. PGND might cause a lot of noise due to the coil current of PGND. Try to connect with analog ground, after smoothing with input capacitor CVL1 and output capacitor CO1. PAD is used for improving the efficiency of IC heat radiation. Solder PAD to GND pin (analog ground). Moreover, connect ground plane of board using via as shown in the patterns of next page. The efficiency of heat radiation improves according to the area of ground plane. When those pins are not connected directly near the chip, influence is give to the performance of BD6150, and may limit the current drive performance. As for the wire to the inductor, make its resistance component small so as to reduce electric power consumption and increase the entire efficiency. The layout pattern in consideration of these is shown in the next page.
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19/28
2011.06 - Rev.B
BD6150MUV
●Recommended PCB layout pattern L1 4.7µH C_VL1 10µF/25V SBD 60V C_VR3 2.2µF/10V C_VB1 2.2µF/25V
Technical Note
U1 BD6150MUV
76
4R7
D6150
CO1 2.2µF/50V
R_OC 56kΩ R_VT 1 MΩ
R_VD 26.7kΩ R_ISET 22kΩ
Top Layer
Mid layer 1
Mid layer 2
Bottom layer Fig. 39 PCB layout patterns ●About heat loss In heat design, operate the DC/DC converter in the following condition. (The following temperature is a guarantee temperature, so consider the margin.) 1. Ambient temperature Ta must be less than 85℃. 2. The loss of IC must be less than dissipation Pd.
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20/28
2011.06 - Rev.B
BD6150MUV
●Application example ・LED current setting controlled ISETH resistor. 21.5kΩ : 20.1mA 27.0kΩ : 16.0mA 14.7kΩ : 29.59mA ・Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristics p.3 and function (p.12).
Technical Note
15inch panel
Battery or adapter
Battery or adapter
10µF
4.7µH 2.2µF / 50V VBAT SW SW VREG FAILFLAG
10LED × 6parallel
1µF 10kΩ 2.2µF
PGND
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
10LED × 6parallel
1µF 10kΩ
2.2µF
PGND
1MΩ
1MΩ
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
fPWM=100Hz~1kHz
VDET
26.7k Ω
26.7k Ω
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 68kΩ
BD6150MUV
LED1 LED2 LED3 LED4 LED5
68kΩ
GND
GND
GND
GND
ISET
N.C. 27kΩ
ISET
LED6
LED6 N.C. 27kΩ
16mA
16mA
Fig.40 10 series×6parallel, LED current 16mA setting Switching frequency 750kHz setting example Power control PWM application
Fig.41 10 series×6 parallel, LED current16mA, Switching frequency 1250kHz example Power control PWM application
Battery or adapter
Battery or adapter
10µF
4.7µH 2.2µF / 50V VBAT SW SW VREG FAILFLAG
10LED × 6parallel
1µF 10kΩ 2.2µF
PGND
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
10LED × 6parallel
1µF 10kΩ
2.2µF
PGND
1MΩ
1MΩ
VDET
VDET
26.7k Ω
26.7k Ω
LED ON/OFF （Enable）
10kΩ 10kΩ
LED ON/OFF （Enable）
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
10kΩ 10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
PWM
fPWM=100Hz~25kHz
N.C.
PWM
fPWM=100Hz~25kHz
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 330pF 68kΩ
BD6150MUV
LED1 LED2 LED3 LED4 LED5
330pF
68kΩ
GND
GND
GND
GND
ISET
N.C. 27kΩ
ISET
LED6
LED6 N.C. 27kΩ
16mA
16mA
Fig.42 10 series×6parallel, LED current 16mA setting Switching frequency 750kHz setting example Current driver PWM application
Fig.43 10 series×6parallel, LED current 16mA setting Switching frequency 1250kHz setting example Current driver PWM application
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21/28
2011.06 - Rev.B
BD6150MUV
Technical Note
13~14inch panel
Battery or adapter
Battery or adapter
10µF
4.7µH 2.2µF / 50V VBAT SW SW VREG FAILFLAG
8LED × 6parallel
1µF 10kΩ 2.2µF
PGND
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
8LED × 6parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 69.8k Ω
2.2MΩ 69.8k Ω
fPWM=100Hz~1kHz
VDET
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
LED ON/OFF （Enable）
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
10kΩ 10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
PWM
fPWM=100Hz~25kHz
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 330pF 56kΩ
BD6150MUV
LED1 LED2 LED3 LED4 LED5
56kΩ
GND
GND
GND
GND
ISET
N.C. 27kΩ
ISET
LED6
LED6 N.C. 27kΩ
16mA
16mA
Fig.44 8series× 6paralell LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application
Fig.45 8series×6paralell, LED current 16mA setting, Switching frequency 1250kHz setting example Current driver PWM application
10~12inch panel
Battery or adapter
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
7LED × 6parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 78.7k Ω
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5
47kΩ
GND
GND
ISET
LED6 N.C. 27kΩ
16mA
Fig.46 7series×6parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application
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22/28
2011.06 - Rev.B
BD6150MUV
Technical Note
7inch panel
Battery or adapter Battery or adapter
10µF
4.7µH 2.2µF / 50V VBAT SW SW VREG FAILFLAG
8LED × 3parallel
1µF 10kΩ 2.2µF
PGND
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
6LED × 4parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 69.8k Ω
2.2MΩ 69.8k Ω
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
fPWM=100Hz~1kHz
VDET
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 39kΩ
BD6150MUV
LED1 LED2 LED3 LED4 LED5
39kΩ
GND
GND
GND
GND
ISET
N.C. 27kΩ
ISET
LED6
LED6 N.C. 27kΩ
16mA
16mA
Fig.47 8series×3parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application
Fig.48 6series×4parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application
Battery or adapter
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
8LED × 3parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 69.8k Ω
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5
56kΩ
GND
GND
ISET
LED6 N.C.
21.5kΩ
40.2mA
Fig.49 8series×3parallel, LED current 40.2mA setting, Switching frequency 1250kHz setting example Power control PWM application
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23/28
2011.06 - Rev.B
BD6150MUV
Technical Note
5inch panel
Battery or adapter Battery or adapter
10µF
4.7µH 2.2µF / 50V VBAT SW SW VREG FAILFLAG
8LED × 2parallel
1µF 10kΩ 2.2µF
PGND
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
8LED × 2parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 69.8k Ω
2.2MΩ 69.8k Ω
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
fPWM=100Hz~1kHz
VDET
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 47kΩ
BD6150MUV
LED1 LED2 LED3 LED4 LED5
33kΩ
GND
GND
GND
GND
ISET
N.C. 27kΩ
ISET
LED6
LED6 N.C.
16mA
21.5kΩ
40.2mA
Fig.50 8series×2parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application
Fig.51 8series×2parallel, LED current 40.2mA setting, Switching frequency 1250kHz setting example Power control PWM application
Battery or adapter
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
8LED × 2parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 69.8k Ω
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5
68kΩ
GND
GND
ISET
LED6 N.C.
14.7kΩ
88.8mA
Fig.52 8series×2parallel, LED current 88.8mA setting, Switching frequency 1250kHz setting example Power control PWM application
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24/28
2011.06 - Rev.B
BD6150MUV
Technical Note
Battery or adapter
Battery or adapter
10µF
4.7µH 2.2µF / 50V VBAT SW SW VREG FAILFLAG
3LED × 5parallel
1µF 10kΩ 2.2µF
PGND
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
3LED × 6parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 187k Ω
2.2MΩ 187k Ω
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
fPWM=100Hz~1kHz
VDET
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 47kΩ
BD6150MUV
LED1 LED2 LED3 LED4 LED5
33kΩ
GND
GND
GND
GND
ISET
N.C. 27kΩ
ISET
LED6
LED6 N.C.
16mA
14.7kΩ
29.6mA
Fig.53 3series×5parallel, LED current 16mA setting, Switching frequency 1250kHz setting example Power control PWM application
Fig.54 3series×6parallel, LED current 29.6mA setting, Switching frequency 1250kHz setting example Power control PWM application
Battery or adapter
Battery or adapter
10µF
4.7µH 2.2µF / 50V VBAT SW SW VREG FAILFLAG
3LED × 6parallel
1µF 10kΩ 2.2µF
PGND
10µF
4.7µH 2.2µF / 50V VREG FAILFLAG VBAT SW SW
10LED × 1parallel
1µF 10kΩ
2.2µF
PGND
2.2MΩ 187k Ω
1MΩ
fPWM=100Hz~1kHz
VDET
PWM
LED ON/OFF （like Enable）
10kΩ
fPWM=100Hz~1kHz
VDET
26.7k Ω
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
PWM
LED ON/OFF （like Enable）
10kΩ
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND
N.C.
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5 68kΩ
BD6150MUV
LED1 LED2 LED3 LED4 LED5
47kΩ
GND
GND
GND
GND
ISET
N.C.
ISET
LED6
LED6 N.C.
14.7kΩ
177.6mA
14.7kΩ
177.6mA
Fig.55 3series×6parallel, LED current 177.6mA setting, Switching frequency 1250kHz setting example Power control PWM application
Fig.56 10series×1parallel, LED current 177.6mA setting, Switching frequency 1250kHz setting example Power control PWM application
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25/28
2011.06 - Rev.B
BD6150MUV
●Application example of Analog dimming Control LED current to charged D/A voltage. Show application example and typ control. Please decide final value after you evaluated application, characteristic.
Battery or adapter
4.2V to 26V
Technical Note
LEDcurrent = typ LEDcurrent =
432 470kΩ 432 470kΩ
+ +
432 DAC 122kΩ ISETvoltage 432 122kΩ DAC 0.6V
10µF
4.7µH 2.2µF / 50V SW SW FAILFLAG VREG VBAT
10LED × 6parallel
1µF 10kΩ
1µF
1µF
GND
2.2MΩ
PGND
VDET
56k Ω
Vin=2.1V to 5.5V
Power ON/OFF
10kΩ
PWMPOW PWMDRV N.C. TEST FSEL OCPSET PGND GND GND
N.C.
BD6150MUV
LED1 LED2 LED3 LED4 LED5
GND
ISET
330pF
68kΩ
LED6 N.C.
20mA
470kΩ 22kΩ D/A
Fig. 57 BD6150 Analog style optical application
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26/28
2011.06 - Rev.B
BD6150MUV
Technical Note
●Notes for use (1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) Operating conditions These conditions represent a range within which characteristics can be provided approximately as expected. The electrical characteristics are guaranteed under the conditions of each parameter. (3) Reverse connection of power supply connector The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the IC’s power supply terminal. (4) Power supply line Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for the analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. For the GND line, give consideration to design the patterns in a similar manner. Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. (5) GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient. (6) Short circuit between terminals and erroneous mounting In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the ICs can break down. (7) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. (8) Inspection with set PCB On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress. Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB. (9) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) Ground wiring pattern If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well. (11) External capacitor In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc. (12) Thermal shutdown circuit (TSD) When junction temperatures become 175℃ (typ) or higher, the thermal shutdown circuit operates and turns a switch OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as much as possible, is not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the LSI with this circuit operating or use the LSI assuming its operation. (13) Thermal design Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (Pd) in actual states of use. (14) Selection of coil Select the low DCR inductors to decrease power loss for DC/DC converter.
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27/28
2011.06 - Rev.B
BD6150MUV
●Ordering part number
Technical Note
B
D
6
Part No. 6150
1
5
0
M
U
V
-
E
2
Part No. BD
Package MUV: VQFN024V4040
Packaging and forming specification E2: Embossed tape and reel
VQFN024V4040
4.0±0.1
4.0±0.1
Tape Quantity Embossed carrier tape 2500pcs E2
The direction is the 1pin of product is at the upper left when you hold
1.0MAX
1PIN MARK S
+0.03 0.02 -0.02 (0.22)
Direction of feed
( reel on the left hand and you pull out the tape on the right hand
)
0.08 S C0.2
1 24
2.4±0.1
6
0.4±0.1
19 18 13
12
0.75
0.5
2.4±0.1
7
+0.05 0.25 -0.04
1pin
Direction of feed
(Unit : mm)
Reel
∗ Order quantity needs to be multiple of the minimum quantity.
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28/28
2011.06 - Rev.B
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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