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July 2013
FAN7340
LED Backlight Driving Boost Switch
Features
Description
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Single-Channel Boost LED Switch
Internal Power MOSFET for PWM Dimming:
R DS(on) = 3.4 Ω at V GS =10 V, BV DSS =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
The FAN7340 is a single-channel boost controller that
integrates an N-channel power MOSFET for PWM
dimming using Fairchild’s proprietary planar Double-
diffused 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
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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 ? 1.0.1
www.f airchildsemi.com
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