BD6590MUV

LED Drivers for LCD Backlights White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type) BD6590MUV No.11040EBT14 ●Description BD6590MUV 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. BD6590MUV 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) 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) Input voltage range (4.5V ~ 5.5V) 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, NetPC,portable DVD player, DPF, etc. ●Absolute Maximum Ratings (Ta=25℃) Parameter Maximum applied voltage 1 Maximum applied voltage 2 Maximum applied voltage 3 Power dissipation 1 Power dissipation 2 Power dissipation 3 Operating temperature range Storage temperature range Symbol VMAX1 VMAX2 VMAX3 Pd1 Pd2 Pd3 Topr Tstg Ratings 7 25 41 500 780 1510 -40 ~ +85 -55 ~ +150 Unit V V V mW mW mW ℃ ℃ Condition VBAT, ISET, TEST, RSTB, PWMDRV PWMPOW, VDET, FAILFLAG, OCPSET LED1, LED2, LED3, LED4, LED5, LED6 SW *1 *2 *3 - *1 Reduced 4.0mW/℃ With Ta>25℃ when not mounted on a heat radiation Board. *2 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/℃. *3 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/℃. ●Recommended Operating Range (Ta=-40℃ ~ +85℃) Parameter Power supply voltage Symbol VBAT Limits Min. 4.5 Typ. 5.0 Max. 5.5 Unit V Condition www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/26 2011.07 - Rev.B BD6590MUV ●Electrical characteristic(Unless otherwise specified, VBAT=5V, 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] 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 LED terminal over voltage protect ISET voltage ILMAX ILACCU ILMAT ILOCP LEDOVP Iset 10.0 0.5 0 11.5 0.6 30 ±3.0 ±1.5 0.1 13.0 0.7 mA % % mA V V 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 A A V V µA OCPSET=68kΩ OCPSET=2MΩ 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 V MHz % Ω UVLO 2.9 3.3 3.7 V VBAT falling edge FFIR FFIST 1.0 2.0 0.1 3.0 2.0 kΩ µA FAILFLAG=2.5V PWMPOW=0V FSL FSH FSR 0 2.1 100 300 0.9 5.5 500 V V kΩ PDRVL PDRVH DRVR 0 2.1 100 300 0.9 5.5 500 V V kΩ POWL POWH POWR 0 2.1 100 300 0.9 VBAT 500 V V kΩ PWMPOW=3V Iq Idd 0.1 3.2 4.4 4.8 Technical Note Unit µA mA Condition PWMPOW=PWMDRV=RSTB=0V VDET=0V,ISET=27kΩ FSEL=L (GND short) LED1-6=0.3V ISW=80mA *1 Detect voltage of VDET pin Detect voltage of VDET pin ILED=16mA Each LED current/Average (LED1-6) ILED=16~20mA Current limit value at ISET resistor 1kΩ setting PWMDRV=2.5V *1 This parameter is tested with DC measurement. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/26 2011.07 - Rev.B BD6590MUV ●Block Diagram VBAT VBAT FAILFLAG Technical Note SBD OPEN/ Output short PROTECT VDET UVLO RSTB Internal Power Supply Internal Reset Output Over Voltage PROTECT TSD FAULT DETECTOR LED TERMINAL OPEN/SHORT DETECTOR ERRAMP PWM COMP + LED1 LED2 PWMPOW Internal Power Control 5.5V Clamp Soft start SW SW Control SENCE LED RETURN LED3 LED4 LED5 LED6 OSC Current SENCE Over Current Protect + SELECT 8ch PGND + - ISET Resistor driver Current Driver N.C. N.C. N.C. OCPSET TEST GND PWMDRV ISET GND Fig.1 BD6590MUV block diagram ●Application Example Adapter 4.5V to 30V Battery 4.5V to 5.5V 10µF 4.7µH 10S × 6P 2.2µF/50V 1µF FAILFLAG SW SW VBAT VBAT 10kΩ 1MΩ VDET 26.7kΩ PWMDRV 10KΩ PWM PWMPOW fPWM=100Hz~1kHz RESET RSTB BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA TEST OCPSET 68kΩ PGND GND GND ISET 27kΩ Fig.2 Application example (10LED × 6parallel) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/26 2011.07 - Rev.B BD6590MUV ●Pin Assignment Table PIN No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 5 16 17 18 19 20 21 22 23 24 VBAT Technical Note PIN Name SW SW N.C. PGND FAILFLAG OCPSET VDET TEST RSTB ISET GND N.C. LED1 LED2 LED3 LED4 LED5 LED6 N.C. GND PWMDRV VBAT PWMPOW VBAT In/Out Out Out Out In In In In In In In In In In In In In 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 Reset 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 Switching Tr drive terminal Terminal diagram H H F D C A A J J A B F C C C C C C F B G I E I VBAT VBAT P IN P IN P IN PIN G ND P GND GND G ND A VBAT B VBAT C D P IN 5.5V Clump G ND P IN P IN PIN GND P GND E VBAT F G H P IN P IN G ND PGND G ND I J www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 4/26 2011.07 - Rev.B BD6590MUV Technical Note ●Description of Functions 1) PWM current mode DC/DC converter While BD6590MUV 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. BD6590MUV has many safety functions, and their detection signals stop switching operation at once. 2) Soft start BD6590MUV 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, RSTB 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.3 Soft start Fig.4 Soft start reset and set 3) 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.5 FAILFLAG operating description www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/26 2011.07 - Rev.B BD6590MUV 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.6 VDET operating description open normal return off return ・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 BD6590MUV has thermal shut down function. The thermal shut down works at 175℃ or higher, and the IC changes from activation into non-activation. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/26 2011.07 - Rev.B BD6590MUV Technical Note ●How to set over voltage limit This section is especially mentioned here because the spec shown electrical characteristic is necessary to explain this section. Over voltage limit min 0.96V typ 1.00V max 1.04V LED control voltage min 0.56V typ 0.70V max 0.84V LED terminal over voltage protect min 10.0V typ 11.5 V max 13.0V 1. 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 2.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 3.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 4. The below shows how to control resistor setting over voltage Please fix resistor high 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 = 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 VOUT = 1.0 × (2.2MΩ + 69.8kΩ)/ 69.8kΩ = 32.52 (Example 3) VF=3.6V max, serial = 9 LED OVP = 1.0V, R1 = 2.2MΩ, R2 = 62kΩ 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 VOUT R1 VDET R2 Fig. 7 Control resistor setting www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 7/26 2011.07 - Rev.B BD6590MUV Technical Note ・Over Current Limit Over current flows the current detection resistor that is connected to internal switching transistor source and between PGND, Current sense voltage turns more than detection voltage decided with OCPSET, over current protection is operating and it is prevented from flowing more than detection current by reducing ON duty of switching Tr without stopping boost.As over current detector of BD6590MUV is detected peak current, current more than over current setting value does not flow. And, over current value can decide freely by changing OCPSET voltage. The range of over current setting is from 0.5A to 2.5A. R (OCPSET)=34kΩ×Over current setting OCPSET R(OCPSET) Current Sence + - detect Fig. 8 Architecture TYP value of over current is 2A, MIN = 1.4A and MAX = 2.6A and after the current value which was necessary for the normal operation was decided, detection resistor is derived by using MIN value of over current detection value. For example, detection resistor when typ value was set at 2A is given as shown below. Detection resistor =34kΩ×2A=68kΩ MAX current dispersion of this detection resistor value is MAX current = 2A×1.3=2.6A For example, 34kΩ → 1A, 68kΩ → 2A As over current detector of BD6590MUV is detected the peak current, it have to estimate peak current to flow to the coil by operating condition. In case of, ○ Supply voltage of coil = VIN ○ Inductance value of coil = L ○ Switching frequency = fsw MIN=1.0MHz, Typ=1.25MHz, MAX=1.5MHz ○ Output voltage = VOUT ○ Total LED current = IOUT ○ Average current of coil = Iave ○ Peak current of coil = Ipeak ○ Efficiency = eff ○ ON time of switching transistor = Ton Ipeak = (VIN / L) × (1 / fsw) × (1-(VIN / VOUT)) Iave = (VOUT × IOUT / VIN) / eff 1/2 Ton = (Iave × (1-VIN/VOUT) × (1/fsw) × (L/VIN) × 2) Each current is calculated. As peak current varies according to whether there is the direct current superposed, the next is decided. (1-VIN/VOUT) × (1/fsw) < Ton→ peak current = Ipeak /2 + Iave (1-VIN/VOUT) × (1/fsw) > 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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/26 2011.07 - Rev.B BD6590MUV ・Soft start of over current limit for application Technical Note 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 OCPSET 36ms Current Sence + - Detect 1.5A Coil current Zoom OCPSET R(OCPSET) Fig.9 VBAT=5V, 6parallel 10serial 20mA/ch, OCPSET=68kΩ,330pF www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 9/26 2011.07 - Rev.B BD6590MUV 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.10 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 terminal voltage 40 35 30 25 20 15 10 5 0 10 LED short-circuited LED short LED1 12.7V 0.7V LED2 Vout LED 1 LED 2 Voltage range of LED short-circuited I LED1 I LED2 20mA 20mA normal 0mA 20 30 40 LED Vf (Vout) LED 1 FeedBack cut Fig.11 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. 4) When the resistor of over current detection comes off All the LEDs do not turn on due to open protect of the OCP resistor, which stops boost operation and consequently prevents passing LED current. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10/26 2011.07 - Rev.B BD6590MUV ●Control signal input timing Technical Note 0V 4.1V 1 VBAT VBAT 2 Min. 100µs 10k Ω 5V PWMPOW PWMDRV VREG DC/DC VOUT P IN Rin GND Fig.12 Control signal timing Fig.13 Voltage with a control sign higher than VBAT Example corresponding to application of conditions In case you input control signs, such as PWMPOW, and PWMDRV, in the condition that the standup of supply voltage (VBAT) is not completed, be careful of the following point. ①Input each control signal after VBAT exceeds 4.1V. ②When you input PWMPOW during the standup of VBAT, please give the standup time as Min.100µs from 4.1V to stable voltage for VBAT. There is no timing limitation at each input signal of PWMPOW and PWMDRV. If each control sign changes into a condition higher than VBAT in (1) and (2), it goes via the ESD custody diode by the side of VBAT of each terminal. A power supply is supplied to VBAT and there is a possibility of malfunctioning. In order to avoid this condition, as shown in the above figure, please insert about 10kΩ in a signal line, and apply current qualification. Please confirm an internal pull down resistor in the block diagram and electrical property. ●Start control (PWMPOW) and select LED current driver (PWMDRV) BD6590MUV 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. RSTB L H H H H PWMPOW H, L L H L H PWMDRV H, L L L H H IC Off Off On Off On OFF 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 RSTB,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 RSTB, PWMPOW and PWMDRV “L”. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 11/26 2011.07 - Rev.B BD6590MUV Technical Note ●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 = 432/RISET (A) 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) 24.0mA 22kΩ (E24) 19.6mA 24kΩ (E24) 18.0mA 27kΩ (E24) 16.0mA 30kΩ (E24) 14.4mA 33kΩ (E24) 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% 1) Current driver PWM control is controlled by providing PWM signal to PWMDRV, as it is shown Fig.14. 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.14 PWMDRV sequence 2) Power control PWM control is controlled by providing PWM signal to PWMPOW, as it is shown Fig.15. 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.15 PWMPOW sequence www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/26 2011.07 - Rev.B BD6590MUV Technical Note ●Output voltage ripple for PWM dimming Conditions: 8serial 6parallel, LED current=20mA/ch, VBAT=5V, Coil Power=7V, Ta=25℃, output capacitor =2.2μF(50V/B3) PWMDRV Lower ripple Voltage (under 200mV) Output Voltage (AC) 780mA Input Current 1ms/div. ●LED current rise and fall for PWM dimming Conditions: 8serial 6parallel, LED current=20mA/ch, VBAT=5V, Coil Power=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 PWM characteristics of current driver PWM PWM characteristics of power control PWM www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 13/26 2011.07 - Rev.B BD6590MUV ●Main characteristics of efficiency Conditions: 10serial 6parallel, LED current=20mA/ch, output capacitor=2.2μF(50V/B3) Technical Note 100 95 90 85 Ta=-40°C Efficiency [%] Ta=85°C Ta=25°C 80 75 70 65 60 55 50 5 10 15 20 25 30 Coil Power [V] Efficiency vs duty (10serial x 6strings) 100.0% 90.0% 80.0% 70.0% Efficiency[%] 60.0% 50.0% 40.0% 30.0% 20.0% 10.0% 0.0% 0 10 20 30 40 50 60 PWM Duty[%] 70 80 90 100 efficiency for PWMPOW Control Coil Power=12V Ta=25℃ 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 10 20 30 40 50 60 70 80 90 100 PWM Duty(%) Efficiency of current driver PWM efficiency（％） Efficiency of power control PWM www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/26 2011.07 - Rev.B BD6590MUV 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 BD6590MUV 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 7V. That application is shown in below Fig.16. The higher voltage source is applied to the power source of coil that is connected from 4.5V to 5.5V into IC VBAT, please follow the recommend design in Fig.16. 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. Adapter 4.5V to 30V Battery 4.5V to 5.5V 10µF 4.7µH 10S × 6P 2.2µF/50V 1µF FAILFLAG SW SW VBAT VBAT 10kΩ 1MΩ VDET 26.7kΩ PWMDRV 10KΩ PWM PWMPOW fPWM=100Hz~1kHz RESET RSTB BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA TEST OCPSET 68kΩ PGND GND GND ISET 27kΩ Fig.16 Application at the time of power supply isolation (6parallel) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15/26 2011.07 - Rev.B BD6590MUV Technical Note ●PCB Layout In order to make the most of the performance of BD6590MUV, its PCB layout is very important. Characteristics such as efficiency and ripple and the likes change greatly with layout patterns, which please note carefully. Adapter 4.5V to 30V CVL1 10µF 4.7µH 10LED × 6parallel Battery 4.5V to 5.5V 2.2µF/50V CO1 CVB1 1µF RVT FAILFLAG SW SW VBAT VBAT 10kΩ 1MΩ PWMDRV 10KΩ PWM PWMPOW VDET RVD 26.7kΩ fPWM=100Hz~1kHz RESET RSTB BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 each16mA TEST ROC 68kΩ OCPSET PGND GND GND ISET 27kΩ RISET Fig. 17 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 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(27kΩ) 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(1MΩ) & RVD(26.7kΩ)> Put over current limit setting resistor RVT(1MΩ) & RVD(26.7kΩ) 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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 16/26 2011.07 - Rev.B BD6590MUV ● Recommended PCB Layout L1 4.7µH C_VL1 10µF/25V SBD 60V C_VB1 2.2µF/10V Technical Note U1 BD6590MUV 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. 18 PCB Layout www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/26 2011.07 - Rev.B BD6590MUV ●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 10μH 4.7μH 4.7μH ▪Capacitor Value Pressure Manufacturer MURATA MURATA MURATA MURATA MURATA MURATA MURATA TDK MURATA MURATA Product number GRM188B31A225K GRM319R61E475K GRM21BR61E475K GRM31CB31E106K GRM219R61A106K GRM31MB31H105K GRM21BB31H105K C3225JB1H225K GRM31CB31H225K GRM219B31H334K Vertical 1.6 3.2 2.0 3.2 2.0 3.2 2.0 3.2 3.2 2.0 Size Horizontal 0.8 1.6 1.25 1.6 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 Height Manufacturer TDK TDK TDK TOKO TOKO Product number LTF5022T-4R7N2R0-LC VLP6810T-4R7M1R6 VLP6810T-100M1R1 A915AY-4R7M B1015AS-4R7M Vertical 5.0 6.3 6.3 5.2 8.4 Size Horizontal 5.2 6.8 6.8 5.2 8.3 Height 2.2 1.0 1.0 3.0 4.0 Technical Note DC current (mA) 2000 1600 1100 1870 3300 DCR (Ω) 0.073 0.167 0.350 0.045 0.038 TC B X5R X5R B X5R B B B B B Capa Tolerance +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% [ Supply voltage capacitor ] 2.2μF 10V 4.7μF 25V 4.7μF 25V 10μF 25V 10μF 10V [ Output capacitor ] 1μF 50V 1μF 50V 2.2μF 50V 2.2μF 50V 0.33μF 50V ▪Resistor Value 10kΩ 15kΩ 18kΩ 22kΩ 24kΩ 27kΩ 30kΩ 33kΩ 56kΩ 62kΩ 68kΩ 75kΩ 2.2MΩ ▪SBD Pressure 60V Tolerance ±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% 0.8±0.1 0.85±0.1 1.25±0.1 1.6±0.2 0.85±0.15 1.15±0.1 1.25±0.1 2.0±0.2 1.6±0.2 0.85±0.1 Manufacturer ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Product number MCR03PZPZD1002 MCR03PZPZD1502 MCR03PZPZD1802 MCR03PZPZD2202 MCR03PZPZD2402 MCR03PZPZD2702 MCR03PZPZD3002 MCR03PZPZD3302 MCR03PZPZD5602 MCR03PZPZD6202 MCR03PZPZD6802 MCR03PZPZD7502 MCR03PZPZD2204 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 Manufacturer ROHM Product number RB160M-60 Vertical 3.5 Size Horizontal 1.6 Height 0.8 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. ●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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 18/26 2011.07 - Rev.B BD6590MUV 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. (7) 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. (8) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. (9) 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. (10) 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. (11) 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. (12) 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. (13) 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. (14) Thermal design Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (Pd) in actual states of use. (15) Selection of coil Select the low DCR inductors to decrease power loss for DC/DC converter. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 19/26 2011.07 - Rev.B BD6590MUV ●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 to function 15inch panel Adapter 4.5V to 30V Battery 4.5V to 5.5V Technical Note 10µF 4.7µH 10S × 6P 2.2µF/50V 1µF F AILFLAG SW SW VBAT VBAT 10kΩ 1MΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RSTB VDET 26.7kΩ fPWM=100Hz~1kHz RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA TEST OCPSET 68kΩ PGND GND GND ISET 27kΩ Fig.19 10series ×6Parallel, LED current 16mA, Switching frequency 1250kHz setting example Power control PWM application Adapter 4.5V to 30V Battery 4.5V to 5.5V 10µF 4.7µH 10S × 6P 2.2µF/50V 1µF fPWM=100Hz~25kHz 10kΩ PWM 10kΩ RESET F AILFLAG SW SW VBAT VBAT 10kΩ 1MΩ PWMDRV PWMPOW VDET 26.7kΩ RSTB BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA TEST OCPSET 68kΩ PGND GND GND ISET 27kΩ Fig.20 10series×6parallel, LED current16mA, Switching frequency 1250kHz setting example Current driver PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20/26 2011.07 - Rev.B BD6590MUV 13~14inch panel Adapter 4.5V to 26.6V Battery 4.5V to 5.5V Adapter 4.5V to 26.6V Battery Technical Note 4.5V to 5.5V 10µF 4.7µH 8S × 6P 10µF 4.7µH 8S × 6P 2.2µF/50V 1µF 2.2µF/50V 1µF F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ 10kΩ PWM 69.8kΩ 10kΩ RESET F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RESET RSTB VDET PWMDRV PWMPOW VDET 69.8kΩ fPWM=100Hz~1kHz BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA fPWM=100Hz~1kHz RSTB BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 each16mA TEST TEST OCPSET 56kΩ PGND GND GND ISET 27kΩ OCPSET 52.2kΩ PGND GND GND ISET 27kΩ Fig.21 8series×6parallel, LED current 16mA, Switching frequency 1250kHz setting example Power control PWM application Fig.22 8series×6parallel, LED current 16mA, Switching frequency 1250kHz setting example Current driver PWM application 10~12inch panel Adapter 4.5V to 23.9V Battery 4.5V to 5.5V 10µF 4.7µH 7S × 6P 2.2µF/50V 1µF F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RSTB VDET 78.7kΩ fPWM=100Hz~1kHz RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 LED7 TEST OCPSET 47kΩ PGND GND GND ISET 27kΩ Each 16mA Fig.23 7series×6parallel, LED current016mA, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 21/26 2011.07 - Rev.B BD6590MUV 7inch panel Adapter 4.5V to 26.6V Battery 4.5V to 5.5V Adapter 4.5V to 21.2V Battery Technical Note 4.5V to 5.5V 10µF 4.7µH 8S × 3P 10µF 4.7µH 6S × 4P 2.2µF/50V 1µF 2.2µF/50V 1µF F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RESET RSTB VDET 69.8kΩ 10kΩ PWM PWMDRV PWMPOW 10kΩ RESET RSTB VDET 69.8kΩ fPWM=100Hz~1kHz BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA fPWM=100Hz~1kHz BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA TEST TEST OCPSET 68kΩ PGND GND GND ISET 27kΩ OCPSET 68kΩ PGND GND GND ISET 27kΩ Fig.24 8series×3parallel, LED current 16mA, Switching frequency 1250kHz setting example Power control PWM application Fig.25 6series×4parallel, LED current 16mA, Switching frequency 1250kHz setting example Power control PWM application Adapter 4.5V to 26.6V Battery 4.5V to 5.5V 10µF 4.7µH 8S × 3P 2.2µF/50V 1µF F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RESET RSTB VDET 69.8kΩ fPWM=100Hz~1kHz BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 40.2mA TEST OCPSET 56kΩ PGND GND GND ISET 21.5kΩ Fig.26 8series×3parallel, LED current 40.2mA, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 22/26 2011.07 - Rev.B BD6590MUV 5inch panel Adapter Adapter 4.5V to 26.6V Battery 4.5V to 5.5V 4.5V to 26.6V Technical Note Battery 4.5V to 5.5V 10µF 10µF 4.7µH 8S × 2P 4.7µH 8S × 2P 2.2µF/50V 2.2µF/50V 1µF FAILFLAG FAILFLAG SW SW VBAT VBAT 10kΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RESET RSTB VDET 69.8kΩ PWM 10kΩ PWMPOW 10kΩ 2.2MΩ PWMDRV VDET 69.8kΩ SW SW VBAT VBAT 10kΩ 1µF 2.2MΩ fPWM=100Hz~1kHz fPWM=100Hz~1kHz BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA RESET RSTB BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 40.2mA TEST TEST OCPSET 68kΩ PGND GND GND ISET OCPSET 33kΩ PGND GND GND ISET 21.5kΩ 27kΩ Fig.27 8series×2parallel, LED current16mA, Switching frequency1250kHz setting example Power control PWM application Fig.28 8series×2parallel, LED current 40.2mA, Switching frequency 1250kHz setting example Power control PWM application Adapter 4.5V to 26.6V Battery 4.5V to 5.5V 10µF 4.7µH 8S × 2P 2.2µF/50V 1µF FAILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ VDET 69.8kΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RSTB fPWM=100Hz~1kHz RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 88.8mA TEST OCPSET 68kΩ PGND GND GND ISET 27kΩ Fig.29 8series×2parallel, LED current 88.8mA, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 23/26 2011.07 - Rev.B BD6590MUV Technical Note Adapter 4.5V to 13V Battery 4.5V to 5.5V Adapter 4.5V to 13V Battery 4.5V to 5.5V 10µF 4.7µH 3S × 5P 10µF 4.7µH 3S × 6P 2.2µF/50V 1µF 2.2µF/50V 1µF F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RSTB VDET 187kΩ 10kΩ PWM PWMDRV PWMPOW 10kΩ RSTB VDET 187kΩ fPWM=100Hz~1kHz RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 16mA fPWM=100Hz~1kHz RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 29.6mA TEST TEST OCPSET 33kΩ PGND GND GND ISET 27kΩ OCPSET 47kΩ PGND GND GND ISET 14.6kΩ Fig.30 3series×5parallel, LED current 16mA, Switching frequency 1250kHz setting example Power control PWM application Fig.31 3series×6parallel, LED current 29.6mA, Switching frequency 1250kHz setting example Power control PWM application Adapter 4.5V to 13V Battery 4.5V to 5.5V Adapter 4.5V to 30V Battery 4.5V to 5.5V 10µF 4.7µH 3S × 6P 10µF 4.7µH 10S × 1P 2.2µF/50V 1µF 2.2µF/50V 1µF F AILFLAG SW SW VBAT VBAT 10kΩ 2.2MΩ F AILFLAG SW SW VBAT VBAT 10kΩ 1MΩ PWMDRV 10kΩ PWM PWMPOW 10kΩ RSTB VDET 187kΩ 10kΩ PWM PWMDRV PWMPOW 10kΩ RSTB VDET 26.7kΩ fPWM=100Hz~1kHz RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 177.6mA fPWM=100Hz~1kHz RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 LED6 Each 177.6mA TEST TEST OCPSET 47kΩ PGND GND GND ISET OCPSET 68kΩ PGND GND GND ISET 14.7kΩ 14.7kΩ Fig.32 3series×6parallel, LED current 177.6mA, Switching frequency 1250kHz setting example Power control PWM application Fig.33 10series×1parallel, LED current177.6mA, Switching frequency 1250kHz setting example Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 24/26 2011.07 - Rev.B BD6590MUV ●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. Technical Note Coil Power 10µF 4.5V to 30V 4.7µH Battery or adapter 4.5V t o 5.5V 10L ED ×6p ar al l el 2.2µF / 50V 1µF 2.2M Ω FAILFLAG SW VBAT VBAT SW VDET 62k Ω fPWM =100Hz~ 1kHz PWMDRV PWMDRV PWMPOW RSTB TEST OCPSET PGND PWM RESET BD6590MUV LED1 LED2 LED3 LED4 LED5 68kΩ GND GND ISET LED6 470k Ω 22k Ω D/A LEDcurrent = typ LEDcurrent = 432 470kΩ 432 470kΩ + + 432 DAC 122kΩ ISETvoltage 432 122kΩ DAC 0.6V Fig.34 BD6590MUV Analog style optical application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 25/26 2011.07 - Rev.B BD6590MUV ●Ordering part number Technical Note B D 6 Part No. 5 9 0 M U V - E 2 Part No. 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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 26/26 2011.07 - 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. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. R1120A