Datasheet LED driver series for LCD back light White LED driver for medium sized and large sized LCD back light BD9470AEFV BD9470AFM General Description Key Specifications BD9470AEFV and BD9470AFM are high efficiency VCC supply Voltage range: 9.0V35.0V driver for white LED. They are designed for large sized LED minimum output current: 40mA LCD. BD9470AEFV and BD9470AFM are built-in LED maximum output current: 250mA DCDC converter that supply appropriate voltage for DCDC oscillation frequency: 150KHz(RT=100Kohm) light source. Operation circuit current: 6mA(typ.) BD9470AEFV and BD9470AFM are also built-in Operating temperature range: -4085 protection function for abnormal state such as OVP: over voltage protection, OCP: over current limit protection of DCDC, SCP: short circuit protection, open Applications detection of LED string. LED driver for TV, monitor and LCD back light Thus they are used for conditions of large output voltage and load conditions. Package Features W (Typ.) x D(Typ.) x H(Max.) 6ch LED constant current driver HSOP-M28 18.50mm x 9.90mm x 2.41mm LED maximum output current 250mA HTSSOP-B28 9.70mm x 6.40mm x 1.00mm Individual PWM dimming modulation allowed for LEDs 2% LED current accuracy (when each LED is set to 130mA) Built-in LED feedback voltage automatic adjustment circuit according to LED current Built-in start-up circuit independent of PWM light modulation built-in VOUT FB voltage maintenance function when PWM=Low0% Built-in LED current stabilization circuit while scanning operation is performed Built-in VOUT discharge circuit while shutdown Figure 1. HSOP-M28 Built-in LED protection (OPEN / SHORT protection) Individual detection and individual LED OFF for both open and short circuit Adjustable LED short-circuit protection threshold PWM-independent LED protection VOUT over voltage protection (OVP) and reduced voltage protection (SCP) circuit Built-in failure indication function Built-in ISET pin short-circuit protection circuit Typical Application Circuit VIN ISET SS PWM1 FB PWM2 RT DCDC GND PWM3 PWM4 N PWM5 CS PWM Figure 2. HTSSOP-B28 REG58 PWM6 GND VCC STB FAIL FAIL STB OVP LSP LED6 UVLO LED5 LED1 LED4 LED2 LED GND LED3 Figure 3. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays www .rohm.com TSZ02201-0F10C1002000-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/35 TSZ2211114001 19.Oct.2013 Rev.003 BD9470AFMBD9470AEFV 1. Specification for BD9470AEFV BD9470AFM Absolute Maximum Ratings (Ta =25C) Parameter Symbol Rating unit OVP Detect Voltage (DCDC Stop) VCC -0.3~36 V LED1~6 pin voltage LED1~6 -0.3~40 V STBFAILUVLOOVP pin voltage STB,FAIL,UVLO,OVP -0.3~36 V ISETFBSS ISETFBSSCSNREG58 RT -0.3~7 V CSNREG58RT pin voltage PWM1~6LSP PWM1~6LSP -0.3~16 Power dissipation (HSOP-M28)*1 Pd 5208 mW Power dissipation (HTSSOP-B28)*2 Pd 4700 mW Operating temperature range Topr -40+85 Storage temperature range Tstg -55+150 Maximum junction temperature Tjmax +150 *1 Decreases -41.7mW/C at Ta=25C or higher (When mounting a four-layer 70.0mmx70.0mmx1.6mm board) *2 Decreases -37.6mW/C at Ta=25C or higher (When mounting a four-layer 70.0mmx70.0mmx1.6mm board) Recommended Operating Ratings Parameter Symbol Rating unit Supply voltage VCC 9.0 35.0 V LED1-4 pin minimum output current ILED MIN 40 mA*1 LED1-4 pin maximum output current ILED MAX 250 mA*1*2*3 LSP input voltage range VLSP 0.32.5 V DC/DC oscillation frequency fsw 100 500 kHz Min. on-duty for PWM light modulation PWM MIN 30 *1 The amount of current per channel *2 If LED makes significant variations in its reference voltage Vf, the driver will increase power dissipation, resulting in a rise in package temperature. To avoid this problem, design the board with thorough consideration given to heat radiation measures. *3 The LED current can be set up to 250mA Pin Configuration ( TOP VIEW ) Outline Dimension Diagrams/Sign Diagrams ISET 1 28 SS LOT No. PWM1 2 27 FB PWM2 3 26 RT PWM3 4 25 DCDC GND PWM4 5 24 N PWM5 6 CS 23 PWM6 22 REG58 7 BD9470AFM GND 8 21 VCC FAIL 9 20 STB OVP 10 LSP 19 LED6 11 18 UVLO LED5 12 17 LED1 LED4 13 LED2 16 LED GND 14 15 LED3 LOT No. 1.REG58 28.VCC 2.CS 27.STB 3.N 26.LSP 4.DCDC GND 25.UVLO BD9470AEFV 5.RT 24.LED1 6.FB 23.LED2 7.SS 22.LED3 8.ISET 21.LED GND 9.PWM1 20.LED4 10.PWM2 19.LED5 11.PWM3 18.LED6 12.PWM4 17.OVP 13.PWM5 16.FAIL 14.PWM6 15.GND Figure 5. Outline Dimension Diagrams/Sign Diagrams Figure 4. Pin ConfigurationTOP VIEW www.rohm.com TSZ02201-0F10C1002000-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/35 TSZ2211115001 19.Oct.2013 Rev.003