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 (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.
●Features
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● Single-Channel Boost LED Switch
● Internal Power MOSFET for PWM Dimming: RDS(on) = 3.4Ω at VGS=10V, BVDSS=400V
● Current Mode PWM Control
● Internal Programmable Slope Compensation
● Wide Supply Voltage Range: 10V to 35V
● LED Current Regulation: ±1%
● Programmable Switching Frequency
● Analog and PWM Dimming
● Wide Dimming Ratio: On Time=10µs to DC
● Cycle-by-Cycle Current Limiting
● Thermal Shutdown: 150°C
● Open-LED Protection (OLP)
● Over-Voltage Protection (OVP)
● Over-Current Protection (OCP)
● Internal Soft-Start
● Error Flag Generation (for External Load Switch)
● 15-Lead SOIC Package
