FAN73402

FAN73402 — LED Backlight Driving Boost Switch July 2013 FAN73402 LED Backlight Driving Boost Switch Features  Single-Channel Boost LED Switch  Internal Power MOSFET for PWM Dimming: RDS(ON)=1.0 Ω at VGS=10 V, BVDSS=200 V  Current-Mode PWM Control  Internal Programmable Slope Compensation  Wide Supply Voltage Range: 10 V to 35 V  LED Current Regulation: ±1%  Programmable Switching Frequency  Analog and PWM Dimming  Wide Dimming Ratio: On Time=10 µs to DC  Cycle-by-Cycle Current Limiting  Thermal Shutdown: 150°C  Open-LED Protection (OLP)  Over-Voltage Protection (OVP)  Over-Current Protection (OCP)  Error Flag Generation (for External Load Switch)  Internal Soft-Start  16-Lead SOIC Package Description The FAN73402 is a single-channel boost controller that integrates an N-channel power MOSFET for PWM dimming using Fairchild’s proprietary planar Doublediffused MOSFET (DMOS) technology. The IC operates as a constant-current source for driving high-current LEDs. It uses Current Mode control with programmable slope compensation to prevent subharmonic oscillation. The IC provides protections including: open-LED protection, over-voltage protection, and direct-short protection for high system reliability. The IC internally generates a FAULT signal with delay if an abnormal LED string condition occurs. PWM dimming and analog dimming functions can be implemented independently. Internal soft-start prevents inrush current flowing into output capacitor at startup. App...