Datasheet LED Drivers for LCD Backlights 1ch Boost up type White LED Driver for large LCD BD9413F 1.1 General Description Key Specifications BD9413F is a high efficiency driver for white LEDs and is Operating power supply voltage range: 9.0V to 35.0V designed for large LCDs. BD9413F has a boost DCDC Oscillator frequency of DCDC: 150kHz (RT=100k) converter that employs an array of LEDs as the light Operating Current: 3.3 mA(Typ.) source. Operating temperature range: -40C to +105C BD9413F has some protect functions against fault conditions, such as over-voltage protection (OVP), over current limit protection of DCDC (OCP), LED OCP 1.2 Package(s) W(Typ) x D(Typ) x H(Max) protection, and Over boost protection (FBMAX). SOP18 11.20mm x 7.80mm x 2.01mm Therefore it is available for the fail-safe design over a Pin pitch 1.27mm wide range output voltage. Features DCDC converter with current mode LED protection circuit (Over boost protection, LED OCP protection) Over-voltage protection (OVP) for the output voltage Vout Adjustable soft start Adjustable oscillation frequency of DCDC Wide range of analog dimming 0.2V to 3.0V UVLO detection for the input voltage of the power stage LED Dimming PWM Over Duty Protection(ODP) Figure 1. SOP18 Applications TV, Computer Display, LCD Backlighting Typical Application Circuit Vout VCC VIN VCC UVLO OVP REG90 STB GATE RT CS SS FAILB DIMOUT PWM ADIM ISENSE DUTYP FB Rs DUTYON GND Figure 2. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has not designed protection against radioactive rays . www.rohm.com TSZ02201-0F2F0C100120-1-2 2015 ROHM Co., Ltd. All rights reserved. 1/33 TSZ22111 14 001 28.Dec.2015 Rev.001DatasheetDatasheet BD9413F 1.3 Pin Configuration 1 VCC 18 REG90 2 17 STB CS 3 OVP GATE 16 4 15 UVLO DIMOUT 5 14 SS GND 6 13 DUTYON ISENSE 7 12 PWM FB 8 11 FAILB DUTYP 9 10 ADIM RT Figure 3. Pin Configuration 1.4 Pin Descriptions No. 1 VCC Power supply pin 2 STB IC ON/OFF pin 3 OVP Over voltage protection detection pin 4 UVLO Under voltage lock out detection pin 5 SS Soft start setting pin 6 DUTYON Over Duty Protection ON/OFF pin 7 PWM External PWM dimming signal input pin 8 FAILB Error detection output pin 9 ADIM ADIM signal input pin 10 RT DC/DC switching frequency setting pin 11 DUTYP Over Duty Protection setting pin 12 FB Error amplifier output pin 13 ISENSE LED current detection input pin 14 GND - 15 DIMOUT Dimming signal output for NMOS 16 GATE DC/DC switching output pin DC/DC output current detect pin, 17 CS OCP input pin 18 REG90 9.0V output voltage pin www.rohm.com TSZ02201-0F2F0C100120-1-2 2015 ROHM Co., Ltd. All rights reserved. 2/33 TSZ22111 15 001 28.Dec.2015 Rev.001