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Fairchild Semiconductor - Primary-Side-Regulation PWM Controller

Numéro de référence FAN103
Description Primary-Side-Regulation PWM Controller
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FAN103 fiche technique
October 2009
FAN103
Primary-Side-Regulation PWM Controller
Features
ƒ Low Standby Power Under 30mW
ƒ High Voltage Startup
ƒ Fewest External Component Counts
ƒ Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
ƒ Green-Mode Function: Linearly-Decreasing PWM
Frequency
ƒ Fixed PWM Frequency at 50kHz with Frequency
Hopping to Solve EMI Problem
ƒ Cable Compensation in CV Mode
ƒ Peak-Current-Mode Control in CV Mode
ƒ Cycle-by-Cycle Current Limiting
ƒ VDD Over-Voltage Protection with Auto Restart
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Gate Output Maximum Voltage Clamped at 15V
ƒ Fixed Over-Temperature Protection with
Auto Restart
ƒ Available in the 8-Lead SOP Package
www.DataSheet4U.com
Applications
ƒ Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, power tools, etc.
ƒ Replaces linear transformer and RCC SMPS
Description
This third-generation Primary-Side-Regulation (PSR)
and highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. The proprietary topology,
TURECURRENT™, of FAN103 enables precise CC
regulation and simplified circuit for battery charger
applications. A low-cost, smaller and lighter charger
results as compared to a conventional design or a linear
transformer.
To minimize standby power consumption, the
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 the power conservation requirement.
By using the FAN103, a charger can be implemented
with few external components and minimized cost. A
typical output CV/CC characteristic envelope is shown
in Figure 1.
VO
Maximum
Minimum
Before Cable Compensation
After Cable Compensation
IO
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
FAN103MY
Operating
Temperature Range
-40°C to +105°C
Eco
Status
Package
Packing Method
Green 8-Lead, Small Outline Package (SOP-8) Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html
© 2009 Fairchild Semiconductor Corporation
FAN103 • Rev. 1.0.1
www.fairchildsemi.com

PagesPages 16
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