Primary-Side-Regulation PWM Controller

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Overview

This highly integrated PWM controller provides several features to enhance the performance of flyback converters. The constant-current-control, proprietary topology enables simplified designs without secondary feedback circuitry for battery-charger applications.
A proprietary Burst-Mode function with low operation current minimizes standby power consumption.
The FAN302UL controller also provides several protections. Cycle-by-cycle current limiting ensures the fixed peak current limit level, even if a short circuit occurs. The gate output is clamped at 15V to protect the power MOS from high gate-source voltage conditions. If either VS OVP or internal OTP is triggered, the circuit enters Latch Mode until AC power is removed.
Using FAN302UL, a charger can be implemented with few external components and minimized cost, compared to a conventional design or a linear transformer.

  • Mobile Handsets
  • Ultra-Low Standby Power: Under 20mW at 264VAC
  • Constant-Current (CC) Control without Secondary-Feedback Circuitry
  • Fixed PWM Frequency at 140kHz with Frequency Hopping to Solve EMI Problems
  • High-Voltage Startup
  • Low Operating Current: 3.5mA
  • Peak-Current-Mode Control in CV Regulation
  • Cycle-by-Cycle Current Limiting
  • VDD Over-Voltage Protection (Auto-Restart)
  • VS Over-Voltage Protection (Latch Mode)
  • VDD Under-Voltage Lockout (UVLO)
  • Gate Output Maximum Voltage Clamped at 15V
  • Fixed Over-Temperature Protection (Latch Mode)
  • Available in an 8-Lead SOIC Package

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FAN302ULMY

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Obsolete

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A

H

P

SOIC-8

1

260

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2500

N

-

-

-

15

17

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