LED Backlight Driving Boost Switch - Fairchild Semiconductor
Description
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:
RDS(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.
Applications
LED Backlight for LCD TV LED Backlight for LCD Monitor LED Lighting
Ordering Information
Part Number FAN7340MX
Operating Temperature
Range
-40°C to +125°C
Package 16-Lead, Small-Outline Integrated Circuit (SOIC)
Packaging Method
Tape & Reel
© 2013 Fairchild Semiconductor Corporation FAN7340 • 1.
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FAN7340 — LED Backlight Driving Boost Switch
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Block Diagram
OVP
20µs Delay 3V
OVP
100mV
ADIM
TSD
1µs
+
Delay
ADIM*4 1.
4~4V
Current S...
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