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BD9470AEFV Datasheet(PDF) 1 Page - Rohm |
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BD9470AEFV Datasheet(HTML) 1 Page - Rohm |
1 / 39 page LED driver series for LCD back light White LED driver for medium sized and large sized LCD back light BD9470AEFV・BD9470AFM ●General Description BD9470AEFV and BD9470AFM are high efficiency driver for white LED. They are designed for large sized LCD. BD9470AEFV and BD9470AFM are built-in DCDC converter that supply appropriate voltage for light source. BD9470AEFV and BD9470AFM are also built-in protection function for abnormal state such as OVP: over voltage protection, OCP: over current limit protection of DCDC, SCP: short circuit protection, open detection of LED string. Thus they are used for conditions of large output voltage and load conditions. ●Features 6ch LED constant current driver LED maximum output current 250mA 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=Low(0%) Built-in LED current stabilization circuit while scanning operation is performed Built-in VOUT discharge circuit while shutdown 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 ●Key Specifications VCC supply Voltage range: 9.0V~35.0V LED minimum output current: 40mA LED maximum output current: 250mA DCDC oscillation frequency: 150KHz(RT=100Kohm) Operation circuit current: 6mA(typ.) Operating temperature range: -40℃~85℃ ●Applications ■ LED driver for TV, monitor and LCD back light ●Package W (Typ.) x D(Typ.) x H(Max.) HSOP-M28 18.50mm x 9.90mm x 2.41mm HTSSOP-B28 9.70mm x 6.40mm x 1.00mm ●Typical Application Circuit Figure 3. Typical Application Circuit Figure 1. HSOP-M28 Figure 2. HTSSOP-B28 STB VCC REG58 GND FB SS RT LED6 PWM4 PWM6 DCDC_GND N ISET CS PWM1 PWM2 LSP PWM3 PWM5 FAIL OVP LED5 LED4 LED_GND LED3 LED2 LED1 UVLO VIN STB PWM FAIL ○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays 1/35 TSZ02201-0F10C1002000-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 19.Oct.2013 Rev.003 www.rohm.com TSZ22111・14・001 Datasheet |
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