FAN302UL Datasheet, PDF (1/19 Pages) Fairchild Semiconductor – PWM Controller for Low Standby Power Battery-Charger Applications

May 2012
FAN302UL
PWM Controller for Low Standby Power Battery-
Charger Applications — mWSaver™ Technology
Features
 mWSaver™ Technology Provides
Best-in-Class Standby Power
 Achieves <10mW, Far Below Energy Star’s 5-Star
Level (<30mW).
 Proprietary 500V High-Voltage JFET Startup
Reduces Startup Resistor Loss
 Low Operation Current in Burst Mode:
350µA Maximum
 Constant-Current (CC) Control without Secondary-
Side Feedback Circuitry
 Fixed PWM Frequency at 140kHz with Frequency
Hopping to Reduce EMI
 High-Voltage Startup
 Low Operating Current: 3.5mA
 Peak-Current-Mode Control with Slope
Compensation
 Cycle-by-Cycle Current Limiting
 V_DD Over-Voltage Protection (Auto-Restart)
 V_S Over-Voltage Protection (Latch Mode)
 V_DD Under-Voltage Lockout (UVLO)
 Gate Output Maximum Voltage Clamped at 15V
 Fixed Over-Temperature Protection (Latch Mode)
 Available in an 8-Lead SOIC Package
Applications
Battery chargers for cellular phones, cordless phones,
PDA, digital cameras, and power tools. Replaces linear
transformers and RCC SMPS.
Description
Advanced PWM controller FAN302UL significantly
simplifies isolated power supply designs that require
Constant Current (CC) regulation of the output. The
output current is precisely estimated with information in
the primary side of the transformer and controlled with
an internal compensation circuit, not only removing the
output current sensing loss, but also eliminating external
CC control circuitry. A Green-Mode function with an
extremely low operating current (200µA) in Burst Mode
maximizes light-load efficiency, enabling conformance
to worldwide Standby Mode efficiency guidelines.
Integrated protections include two-level pulse-by-pulse
current limit, Over-Voltage Protection (OVP), brownout
protection, and Over-Temperature Protection (OTP).
Compared with a conventional approach using external
control circuit in the secondary side for CC regulation;
the FAN302UL reduces total cost, component count,
size, and weight, while simultaneously increasing
efficiency, productivity, and system reliability.
V_O
Maximum
Typical
Minimum
I_O
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
FAN302ULMY
Operating
Temperature Range
-40°C to +105°C
Package
8-Lead, Small-Outline Integrated Circuit (SOIC),
JEDEC MS-012, .150-Inch Narrow Body
Packing
Method
Tape & Reel
© 2011 Fairchild Semiconductor Corporation
FAN302UL • Rev. 1.0.3
www.fairchildsemi.com