BD6592MUV_11

LED Drivers for LCD Backlights White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type) BD6592MUV No.11040ECT33 ●Description BD6592MUV is white LED driver IC with PWM step-up DC/DC converter that can boost max 42.5V and current driver that can drive max 40mA. The wide and precision brightness can be controlled by external PWM pulse. BD6592MUV 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=1MHz), max efficiency 93% 2) High accuracy & good matching (±3%) current drivers 6ch * * 3) Drive up to 12 in series, 6 strings in parallel =72 white LEDs ( white LED Vf=3.5Vmax) 4) Wide input voltage range (2.7V ~ 22V) 5) Rich safety functions ・Over-voltage protection (OVP) ・Over current limit ・External SBD open detect ・Thermal shutdown 6) 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 Power dissipation 1 Power dissipation 2 Power dissipation 3 Operating temperature range Storage temperature range *1 *2 *3 Symbol VMAX1 VMAX2 VMAX3 Pd1 Pd2 Pd3 Topr Tstg Ratings 7 25 50.5 500 780 1510 -30 ~ +85 -55 ~ +150 Unit V V V mW mW mW ℃ ℃ Condition TEST, VREG, SENSP, SENSN, SW, RSTB, PWMPOW, PWMDRV, FAILSEL, ISETH, ISETL LED1, LED2, LED3, LED4, LED5, LED6, VBAT VDET *1 *2 *3 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/℃. ●Recommended operating range (Ta=-30℃ ~ +85℃) Parameter Power supply voltage Symbol VBAT Ratings Min. 2.7 Typ. 12.0 Max. 22.0 Unit V Condition www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/25 2011.06 - Rev.C BD6592MUV ●Electrical characteristic (Unless otherwise specified, VBAT=12V, RSTB=2.5V, Ta = +25℃) Limits Parameter Symbol Unit Min. Typ. Max. [FAILSEL,PWMDRV Terminal] EN threshold voltage (Low) EN threshold voltage (High) 1 EN threshold voltage (High) 2 EN terminal input current [PWMPOW Terminal] Low Input Voltage range High Input Voltage range1 High Input Voltage range2 PWM pull down resistor [RSTB Terminal] Low Input Voltage range High Input Voltage range1 High Input Voltage range2 Current Consumption [Regulator] VREG Voltage Under Voltage Lock Out [Switching Regulator] Quiescent Current 1 Quiescent Current 2 Current Consumption LED Control voltage Over Current Limit voltage SBD Open Protect Switching frequency Duty cycle limit Over voltage limit [Current driver] LED maximum current LED current accuracy LED current matching ISET voltage LED Terminal Over Voltage Protect ILMAX ILACCU ILMAT Iset LEDOVP 0.5 10.0 0.6 11.5 40 ±5 ±3 0.7 13.0 mA % % V V ILED=30mA Iq1 Iq2 Idd VLED Ocp Sop fSW Duty Ovl 0.4 70 0.8 92.5 43.0 0.6 4.6 3.4 0.5 100 1.0 95.0 44.7 3.4 10 5.1 0.6 130 0.1 1.2 99.0 46.4 µA µA mA V mV V MHz % V LED1-6=0.3V LED1-6=0.3V *1 Technical Note Condition VthL VthH1 VthH2 Iin 0 1.4 1.4 - 8.3 0.2 5.0 VBAT 14.0 V V V µA VBAT>5.0V VBAT5.0V VBAT5.0V VBAT 2.1V restriction resistance value < (2.9-2.1)/124μA=6.45kΩ 2． 2. When use the current driver of 3 parallel 2.9V(to RSTB power-supply) - restriction resistance value × 430μA(100℃ input current) > 2.1V restriction resistance value < (2.9-2.1)/430μA=1.86kΩ In addition, the selection number of parallel number of the current driver is changed, the power-supply current of RSTB will be increased. Because the maximum value of the consumption current at the RSTB=2.1V is indicated in the following Table 1, be careful enough when you calculate the restriction resistance. Table1. The use parallel number of current driver at RSTB=2.1V , 100℃ vs. RSTB input current Parallel numbers used for current driver RSTB input current 6 0.12mA 5 0.23mA 4 0.33mA 3 0.43mA 2 0.53mA 1 0.63mA 0 0.74mA ●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 set the matter that the unnecessary LED1 ~ 6 terminal is connected to GND. When it uses with 4 lines and so on, it can correspond to it by connecting 2 unnecessary lines to GND.RSTB is used as a power supply of this decision circuit. The select of the terminal is judged, It has no relation to the logic of PWMPOW and PWMDRV and it isn't judged an unnecessary LED line even if it is connected to GND when it is judged a necessary terminal once. This information can be reset by setting RSTB at 0V. ●Start control and select LED current driver BD6592MUV can control the IC system by RSTB, and IC can power off compulsory by setting 0.2V or below. Also, It powers on PWMPOW is at more than 1.4V and RSTB is at more than 2.25V. When RSTB=PWMPOW=H, ISETH current is selected at PWMDRV=H and ISETL current is selected at PWMDRV=L. The starting current in PWMDRV=L sets OFF second time rise of PWMDRV and it becomes 0mA setting after that. After RSTB sets L once, the starting current can be flowed again by changing it to H. RSTB H H H H L PWMPOW L H L H L, H PWMDRV L L H H L, H IC Off On Off On Off LED current OFF Starting current decided with ISETL OFF Current decided with ISETH OFF www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10/25 2011.06 - Rev.C BD6592MUV Technical Note ●Start to use PWMPOW terminal for the PWM control, PWM operating After RSTB and PWMDRV is changing L  H, input PWM to PWMPOW terminal. There is no constraint in turn of RSTB and PWMDRV. And, because it corresponds to PWM drive of shorter ON time than soft start time (1ms), when PWMPOW is input H more than three times, the soft start is invalidated and it enable to correspond the high-speed drive. Until RSTB is set L, invalidation of the soft start isn't canceled. In case of lighting  light off  lighting, when it turns off the lights with PWM=L and It starts without soft start when it sets PWM modulated light again. But the peak current of the coil changes owing to discharge of output capacitor, It may flow to the over current limit value, as follows Fig.34. Because soft start can be used when it turns off the lights with RSTB=L, The peak current of the coil can be suppressed, as follows Fig.35 and this process of light off is recommended. RSTB PWMDRV PWMPOW Output Voltage Current coil Fig.34 Light off control of PWMPOW pin at PWM control on PWM=L RSTB PWMDRV PWMPOW Output Voltage Current coil Fig.35 Light off control of PWMPOW pin at PWM control on RSTB=L www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 11/25 2011.06 - Rev.C BD6592MUV Technical Note ●Start to use PWMDRV terminal for the PWM control, PWM operating After RSTB and PWMPOW is changing L  H, input PWM to PWMDRV terminal. There is no constraint in turn of RSTB and PWMPOW. When resistance is set as ISET, after RSTB and PWMPOW is changing L  H as follows Fig.36, when it is not input PWM to PWMDRV pin but input L, boost of DC/DC is unstable state because current driver doesn’t pass current. The starting current is pulled from each LED terminal and pressure up operating is stabilized to escape from this state. Also, the starting current can be set up by the resistance value connected to the ISETL terminal. After starting, as the starting current in PWM brightness control become useless, the starting current is set up 0mA at the second rise time of PWMDRV automatically as follows Fig.37. In case of lighting  light off  lighting, when it turns off the lights with PWM=L and It starts without soft start because of soft start period was end when it sets PWM modulated light again. But the peak current of the coil changes owing to discharge of output capacitor, It may flow to the over current limit value, as follows Fig.37. Because soft start can be used when it turns off the lights with RSTB=L, The peak current of the coil can be suppressed, as follows Fig.38 and this process of light off is recommended. RSTB PWMPOW PWMDRV L H L H L H L Output voltage LED pin ON Current driver of starting current OFF ON OF F Fig.36 Off timing of starting current at PWMDRV=L RSTB PWMPOW PWMDRV Output Voltage Current coil Fig.37 Light off control of PWMDRV pin at PWM control on PWM=L RSTB PWMPOW PWMDRV Output Voltage Current coil Fig.38 Light off control of PWMDRV pin at PWM control on RSTB=L www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/25 2011.06 - Rev.C BD6592MUV Technical Note ●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 •LED current dispersion emphasis in the PWM brightness control (Reference) PWM regulation process Current driver Power control Efficiency of LED current 0.5mA (PWM Duty=2.5%) 70% 93% PWM frequency 200Hz Limit dispersion capability of low duty 0.2% 0.5%  2) Power control PWM control  1) Current driver PWM control 1) Current driver PWM control is controlled by providing PWM signal to PWMDRV, as it is shown Fig.25. The current set up with ISETH is chosen as the Hi section of PWMDRV and the current is off as the Lo 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, it makes it possible to brightness control until 20µs (MIN0.4% at 200Hz). And, don't use for the brightness control, because effect of ON/OFF changeover is big under 20µs ON time and under 20µs OFF time. There is no effect of ON/OFF changeover at 0% and 100%, so there is no problem on use. Typical PWM frequency is 100Hz~10kHz. When resistance is set as ISET, RSTB sets H  L, so the starting current may be effective, after RSTB sets L  H, it becomes PWM of the starting current and PWM of ISETH setting current to PWM two times. PW MDRV LED current Coil current IC’s active current ON ON ON OFF OFF OFF ON Fig.39 2) Power control PWM control is controlled by providing PWM signal to PWMPOW, as it is shown Fig.27. The current setting set up with PWMDRV logic is chosen as the Hi section and the current is off as the Lo 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. There is no effect of ON/OFF changeover at 0% and 100%, so there is no problem on use. Typical PWM frequency is 100Hz~1kHz. Also, PWM can't control RSTB and PWMPOW at the same time. After RSTB sets H, control PWM only PWMPOW. PWMPOW LED current Coil current IC’s active current ON ON ON ON OFF OFF OFF OFF Fig.40 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 13/25 2011.06 - Rev.C BD6592MUV Technical Note ●LED current setting range LED current can set up Normal and Starting setting current. LED current can set up Normal current by resistance value (RISETH) connecting to ISETH voltage and LED current can set Starting current by resistance value (RISETL) connecting to ISETL voltage. Setting of each LED current is given as shown below. Normal current = 20mA(24kΩ/RISETH) Starting constant current = 0.6/RISET L Also, Normal current setting range is 10mA~25mA, Starting current setting range is OFF setting or 1µA~100µA. LED current can set OFF setting by open setting ISETL pin. LED current becomes a leak current MAX 1µA at OFF setting. ISETH Normal current setting example RISETH LED current 12kΩ (E12) 16 kΩ (E16) 24kΩ (E24) 25.5 kΩ (E96) 27 kΩ (E12) 30kΩ (E24) 40mA 30mA 20mA 18.8mA 17.8mA 16.0mA ISETL Starting current setting example RISETL LED current 6.2kΩ (E24) 97µA 10kΩ (E6) 60µA 47kΩ (E6) 13µA 100 kΩ (E6) 6µA 560 kΩ (E12) 1.1µA Connect to VREG pin 0mA ●The separations 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 22V. That application is shown in below Fig 41. The higher voltage source is applied to the power source of coil that is connected from an adapter etc. Next, the IC power supply is connected with a different coil power supply. Under the conditions for inputting from 2.7V to 5.5V into IC VBAT, please follow the recommend design in Fig 38. 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. Coil Power supply 7V to 28V Battery 10 μ F 4.7μH 2.2μF 2.2μF 10LED x 6 列 RTR020N05 47mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF RSTB PWMDRV LED1 LED2 LED3 VBAT LED4 LED5 200Hz PWM PWMPOW IC Power supply 2.7V to 5.5V 1 μF VREG GND GND GND GND TEST ISETH ISETL LED6 各 40mA 12kΩ Fig.42 Application at the time of power supply isolation www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/25 2011.06 - Rev.C BD6592MUV 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 6.8µH 10µH = = = output capacitor output capacitor output capacitor 2.2µF/50V 2.2µF/50V 2.2µF/50V 1pcs 2pcs 3pcs This value is just examples, please made sure the final judgment is under an enough evaluation. ●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. to Power Supply PWM CIN L CBAT CREG FAILSEL Reset RSTB PWMPOW to Cathode of LED SBD VDET N.C. Tr GND SW RSENSE SENSP PWMDRV VREG VBAT GND LED6 LED5 LED4 GND LED3 ISETH SENSN COUT to Anode of each LED ISETL GND to GND RISET Fig.42 Layout Connect the input bypath capacitor CIN(10µF) nearest to coil L, as shown in the upper diagram. Wire the power supply line by the low resistance from CIN to VBAT pin. Thereby, the input voltage ripple of the IC can be reduced. Connect smoothing capacitor CREG of the regulator nearest to between VREG and GND pin, as shown in the upper diagram. Connect schottky barrier diode SBD of the regulator nearest to between coil L and switching transistor Tr. And connect output capacitor COUT nearest to between CIN and GND pin. Thereby, the output voltage ripple of the IC can be reduced. Connect switching transistor Tr nearest to SW pin. Wire coil L and switching transistor Tr, current sensing resistor RSENSE by the low resistance. Wiring to the SENSP pin isn't Tr side, but connect it from RSENSE side. Over current value may become low when wiring from Tr side. Connect RSENSE of GND side isolated to SENS pin. Don’t wire between RSENSE and SNESN pin wiring from RSENSE pin to GND pin. And RSENSE GND line must be wired directly to GND pin of output capacitor. It has the possibility that restricts the current drive performance by the influence of the noise when other GND is connected to this GND. Connect LED current setting resistor RISET nearest to ISET pin. There is possibility to oscillate when capacity is added to ISET terminal, so pay attention that capacity isn't added. And, RISET of GND side must be wired directly to GND pin. When those pins are not connected directly near the chip, influence is given to the performance of BD6592MUV, 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 next page. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. LED1 TEST LED2 15/25 2011.06 - Rev.C BD6592MUV ●Recommended PCB layout pattern Technical Note BD6592MUV CREG RISET CBAT L CIN COUT Tr RSENSE Fig.43 Frontal surface Fig.44 Rear surface www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 16/25 2011.06 - Rev.C BD6592MUV Technical Note ●Selection of external parts Recommended external parts are as shown below. When to use other parts than these, select the following equivalent parts. ・Coil Size DC current DCR Value Manufacturer Product number (mA) (Ω) Vertical Horizontal Height (MAX) 4.7μH TOKO A915AY-4R7M 5.2 5.2 3.0 1870 0.045 4.7μH 4.7μH 4.7μH 4.7μH 10μH ・Capacitor Value TOKO TOKO TDK TDK TDK Pressure B1015AS-4R7M A1101AS-4R7M LTF5022T-4R7N2R0 VLP6810T-4R7M1R6 VLP6810T-100M1R1 Manufacturer Product number 8.4 4.1 5.0 6.3 6.3 8.3 4.1 5.2 6.8 6.8 Size Horizontal 1.6 1.25 1.6 1.25 0.8 1.25 1.6 1.25 1.6 1.6 1.25 Size Horizontal 0.3 1.25 Size Horizontal 1.6 Size Horizontal 2.9 5.0 4.0 1.2 2.2 1.0 1.0 3300 1400 2000 1600 1100 TC 0.038 0.115 0.073 0.167 0.350 Cap Tolerance +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% +/-10% Vertical 3.2 2.0 3.2 2.0 1.6 2.0 3.2 2.0 3.2 3.2 2.0 Height 1.6±0.2 0.85±0.15 0.85±0.1 1.25±0.1 0.8±0.1 0.85±0.1 1.15±0.1 1.25±0.1 1.6±0.2 1.6±0.2 0.85±0.1 [ Supply voltage capacitor ] 10μF 10μF 4.7μF 4.7μF 1μF 2.2μF 1μF 1μF 1μF 2.2μF 0.33μF ・Resistor Value 25V 10V 25V 25V 10V 10V 50V 50V 100V 50V 50V MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA MURATA GRM31CB31E106K GRM219BB31A106K GRM319B31E475K GRM21BB31E475K GRM188B10J105K GRM219B11A225K GRM31MB31H105K GRM21BB31H105K GRM31CR72A105K GRM31CB31H225K GRM219B31H334K Product number ] MCR006YZPD163 ] MCR10EZHFSR047 Product number RB160M-60 Product number RTR020N05 RSS065N06 2.0 0.55±0.1 0.6 0.23±0.03 B B B B B B B B X7R B B [ Smoothing capacitor for built-in regulator ] [ Output capacitor ] Tolerance Manufacturer Vertical Height [ Resistor for LED current decision 16kΩ 47mΩ ・SBD Pressure 60V ・MOS FET Nch Pressure 45V 60V ±0.5% ±1% ROHM ROHM [ Resistor for over current decision Manufacturer ROHM Manufacturer ROHM ROHM Vertical 3.5 Height 0.8±0.1 Current ability 2A 6.5A Driving voltage 2.5V 4.0V Vertical 2.8 6.0 Height 1.0 1.75 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. BD6592MUV is designed for the inductance value of 4.7µH. Don’t use the inductance value less than 2.2µH. 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 shown in P.16. ●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. Periphery 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. 17/25 2011.06 - Rev.C BD6592MUV ●Application example ・LED current setting controlled ISETH resistor. 24kΩ : 20mA 16kΩ : 30mA 12kΩ : 40mA ・Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.12). Technical Note 15inch panel Battery 10μF 4.7μH 2.2μF * 2.2μF 10LED x 6parallel RTR020N05 47mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 100Hz~10kHz PWM PWMDRV 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 40mA Can be set up to each15~40mA Fig.45 10 series×6 parallel, LED current 40mA setting Current driver PWM application 13~14inch panel Battery Battery 10μF 4.7μH 2.2μF * 2.2μF 8LED x 6parallel 10μF 4.7μH 2.2μF * 2.2μF 8LED x 6parallel RTR020N05 51mΩ SW SENSP SENSN FAILSEL RTR020N05 VDET 51mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF 100Hz~1kHz PWM RSTB PWMPOW PWMDRV VBAT VREG LED1 LED2 LED3 LED4 LED5 Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 100Hz~10kHz PWM PWMDRV 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ 2.2μF Each 40mA GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 40mA Can be set up to each15~40mA Can be set up to each15~40mA Fig.46 8 series× 6 parallel, LED current 40mA setting Power control PWM application Fig.47 8 series×6 parallel, LED current 40mA setting Current driver PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 18/25 2011.06 - Rev.C BD6592MUV ●Application example ・LED current setting controlled ISETH resistor. 24kΩ : 20mA 16kΩ : 30mA 12kΩ : 40mA ・Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.13). Technical Note 10~12inch panel Battery Battery 10μF 4.7μH 2.2μF * 2.2μF 7LED x 6parallel 10μF 4.7μH 2.2μF * 2.2μF 10LED x 4parallel RTR020N05 56mΩ SW SENSP SENSN FAILSEL RTR020N05 VDET 56mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 100Hz~10kHz PWM PWMDRV 100Hz~10kHz PWM PWMDRV 2.2μF GND GND GND GND TEST ISETH ISETL LED6 16kΩ 2.2μF Each 30mA GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 40mA Can be set up to each15~40mA Can be set up to each15~40mA Fig.48 7 series×6 parallel, LED current 30mA setting Current driver PWM application Fig.49 10 series×4 parallel, LED current 40mA setting Current driver PWM application 7inch panel Battery Battery 10μF 4.7μH 2.2μF * 2.2μF 8LED x 3parallel 10μF 4.7μH 2.2μF * 2.2μF 6LED x 4parallel RTR020N05 68mΩ SW SENSP SENSN FAILSEL RTR020N05 VDET 68mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 100Hz~10kHz PWM PWMDRV 100Hz~10kHz PWM PWMDRV 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ 2.2μF Each 40mA GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 40mA Can be set up to each15~40mA Can be set up to each15~40mA Fig.50 8 series×3 parallel, LED current 40mA setting Current driver PWM application Fig.51 6 series×4 parallel, LED current 40mA setting Current driver PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 19/25 2011.06 - Rev.C BD6592MUV ●Application example ・LED current setting controlled ISETH resistor. 24kΩ : 20mA 16kΩ : 30mA 12kΩ : 40mA ・Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.13). 7inch panel Battery Battery Technical Note 10μF 4.7μH 2.2μF * 2.2μF 4LED x 6parallel 10μF 4.7μH 2.2μF * 2.2μF 8LED x 3parallel RTR020N05 68mΩ SW SENSP SENSN FAILSEL RTR020N05 VDET 68mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF 100Hz~1kHz PWM RSTB PWMPOW PWMDRV VBAT VREG LED1 LED2 LED3 LED4 LED5 Power ON/OFF 100Hz~1kHz PWM RSTB PWMPOW PWMDRV VBAT VREG LED1 LED2 LED3 LED4 LED5 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ 2.2μF Each 40mA GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 80mA Can be set up to each15~40mA Can be set up to each30~80mA Fig.52 4 series×6 parallel, LED current 40mA setting Power control PWM application Fig.53 8 series×3 parallel, LED current 80mA setting Power control PWM application 5inch panel Battery Battery 10μF 4.7μH 2.2μF * 2.2μF 8LED x 2parallel 10μF 4.7μH 2.2μF * 2.2μF 8LED x 2parallel RTR020N05 82mΩ SW SENSP SENSN FAILSEL RTR020N05 VDET 82mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 Power ON/OFF 100Hz~1kHz PWM RSTB PWMPOW PWMDRV VBAT VREG LED1 LED2 LED3 LED4 LED5 100Hz~10kHz PWM PWMDRV 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ 2.2μF Each 40mA GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 80mA Can be set up to each15~40mA Can be set up to each30~80mA Fig.54 8 series×2 parallel, LED current 40mA setting Current driver PWM application Fig.55 8 series×2 parallel, LED current 80mA setting Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20/25 2011.06 - Rev.C BD6592MUV ●Application example ・LED current setting controlled ISETH resistor. 24kΩ : 20mA 16kΩ : 30mA 12kΩ : 40mA ・Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.13). Technical Note 5inch panel Battery Battery 10μF 4.7μH 2.2μF * 2.2μF 4LED x 4parallel 10μF 4.7μH 2.2μF * 2.2μF 8LED x 2parallel RTR020N05 82mΩ SW SENSP SENSN FAILSEL RTR020N05 VDET 82mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 100Hz~10kHz PWM PWMDRV 100Hz~10kHz PWM PWMDRV 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ 2.2μF Each 40mA GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 120mA Can be set up to each30~80mA Can be set up to each45~120mA Fig.56 4 series×4 parallel, LED current 40mA setting Current driver PWM application Fig.57 8 series×2 parallel, LED current 120mA setting Current driver PWM application Battery 10μF 4.7μH 2.2μF * 2.2μF 3LED x 5parallel RTR020N05 82mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF 100Hz~1kHz PWM RSTB PWMPOW PWMDRV VBAT VREG LED1 LED2 LED3 LED4 LED5 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 40mA Can be set up to each15~40mA Fig.58 3 series×5 parallel, LED current 40mA setting Power control PWM application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 21/25 2011.06 - Rev.C BD6592MUV ●Application example ・LED current setting controlled ISETH resistor. 24kΩ : 20mA 16kΩ : 30mA 12kΩ : 40mA ・Brightness control Please input PWM pulse from PWMPOW or PWMDRV terminal. Please refer electrical characteristic p.3 and function (p.13). Over 22V application Coil Power supply 6~30V Battery 8LED x 6parallel Technical Note For Big LED Current Battery 10μF 10μF 4.7μH 2.2μF * RTR020N05 51mΩ SW SENSP SENSN Power ON/OFF 4.7μH 2.2μF * 2.2μF 8LED x 1parallel 2.2μF RTR020N05 FAILSEL VDET SW SENSP FAILSEL VDET 82mΩ SENSN Power ON/OFF RSTB PWMPOW LED1 LED2 LED3 VBAT VREG LED4 LED5 RSTB PWMPOW LED1 LED2 LED3 VBAT 100Hz~10kHz PWM PWMDRV 200Hz PWM PWMDRV 2.7~22V IC Power supply 1μF 2.2μF LED4 LED5 VREG 2.2μF GND GND GND GND TEST ISETH ISETL LED6 12kΩ GND GND GND GND TEST ISETH ISETL LED6 12kΩ 240mA Each 40mA Can be set up to each15~40mA Can be set up to each90~240mA Fig.59 Fig.60 The separation of less than an IC power supply 5V and the coil power supply Coil Power supply 6~30V Battery 10LED x 6parallel 2.2μF * RTR020N05 51mΩ SENSN Power ON/OFF 10μF 4.7μH 2.2μF SW SENSP FAILSEL VDET RSTB PWMPOW LED1 LED2 LED3 VBAT 200Hz PWM PWMDRV 2.7~5.5V IC Power supply 1μ F 2.2μF LED4 LED5 VREG GND GND GND GND TEST ISETH ISETL LED6 12kΩ Each 40mA Can be set up to each15~40mA Fig.61 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 22/25 2011.06 - Rev.C BD6592MUV ●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 Technical Note 10μF 4.7μH 2.2μF * 2.2μF 8LED x 6Parallel RTR020N05 51mΩ SW SENSP SENSN FAILSEL VDET Power ON/OFF RSTB PWMPOW PWMDRV VBAT VREG LED1 LED2 LED3 LED4 LED5 D/A 0.05V 0.2V 0.4V 0.5V 0.6V 0.7V LED current 19.4mA 14.4mA 7.7mA 4.4mA 1.0mA 0mA ISET voltage ISET voltage -D/A + ×800 470kΩ 24kΩ 0.6V 470kΩ + 0.6V-D/A 24kΩ ×800 2.2μF LED current = Each 20mA GND GND GND GND TEST ISETH ISETL LED6 470kΩ 24kΩ typ LED current = D/A Fig.62 Analog style optical application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 23/25 2011.06 - Rev.C BD6592MUV 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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 24/25 2011.06 - Rev.C BD6592MUV ●Ordering part number Technical Note B D 6 Part No. 6592 5 9 2 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. 25/25 2011.06 - Rev.C 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