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Updated at 17/06/2025 10:30:15(UTC+8)

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Description

The FAN73402 is a single-channel boost controller that integrates an N-channel power MOSFET for PWM dimming using Fairchild’s proprietary planar Double-diffused 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.
Features
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Single-Channel Boost LED Switch
Internal Power MOSFET for PWM Dimming: RDS(ON)=1.0Ω at VGS=10V, BVDSS=200V
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)
16-Lead SOIC Package

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