FAN7340

FAN7340 — LED Backlight Driving Boost Switch July 2013 FAN7340 LED Backlight Driving Boost Switch Features                  Single-Channel Boost LED Switch Internal Power MOSFET for PWM Dimming: R DS(on) = 3.4 Ω at VGS=10 V, BVDSS=400 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 FAN7340 is a single-channel boost controller that integrates an N-channel power MOSFET for PWM dimming using Fairchild’s proprietary planar Doublediffused MOS (D MOS) 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. Applic...