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Fairchild Semiconductor - PWM Controller

Numéro de référence FAN301
Description PWM Controller
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FAN301 fiche technique
July 2010
FAN301
PWM Controller for Low Standby Power Charger
Applications
Features
ƒ Ultra-Low Standby Power Under 20mW at 264VAC
ƒ Constant-Current (CC) Control without Secondary-
Feedback Circuitry
ƒ Green Mode: PWM Frequency Linearly Decreasing
ƒ Fixed PWM Frequency at 45kHz with Frequency
Hopping to Solve EMI Problems
ƒ High-Voltage Startup
ƒ Low Operating Current: 3mA
ƒ Peak-Current-Mode Control in CV Mode
ƒ Cycle-by-Cycle Current Limiting
ƒ VDD Over-Voltage Protection (Auto-Restart)
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Gate Output Maximum Voltage Clamped at 15V
ƒ Fixed Over-Temperature Protection (Auto-Restart)
Applications
ƒ Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, power tools
ƒ Replaces linear transformer and RCC SMPS
Description
This highly integrated PWM controller, FAN301,
provides features to enhance the performance of low-
power flyback converters. The proprietary topology
enables simplified circuit design for battery charger
applications. A low-cost, smaller, and lighter charger is
the result, compared to a conventional design or a
linear transformer.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
linearly decrease PWM frequency under light-load
conditions. This green mode assists the power supply in
meeting power conservation requirements.
By using FAN301, a charger can be implemented with
fewer external components and minimized cost. A
typical output CV/CC characteristic envelope is shown
in Figure 1.
Vo Maximum
Typical
Minimum
Io
Figure 1. Typical Output V-I Characteristic
(without Cable)
Ordering Information
Part Number
FAN301MY
Operating
Temperature Range
-40°C to +105°C
Package
8-Lead, Small Outline Package
Packing Method
Tape & Reel
© 2008 Fairchild Semiconductor Corporation
FAN301 • Rev. 1.0.0
www.fairchildsemi.com

PagesPages 16
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