AN-6067 Datasheet, PDF (1/21 Pages) Fairchild Semiconductor – Design and Application of Primary-Side Regulation (PSR) PWM Controller

www.fairchildsemi.com
AN-6067
Design and Application of Primary-Side Regulation (PSR)
PWM Controller
FAN100 / FAN102 / FSEZ1016A / FSEZ1216
Abstract
This application note describes a typical charger using the
PSR controller. Both the features of this controller, as well
as the operation of the power supply adaptor, are presented
in detail. Based on the proposed design guideline, a design
example with detailed parameters is given to demonstrate
the superior performance of the controller.
Applications
ƒ Battery chargers for cellular phones, cordless phones,
PDAs, digital cameras, power tools
ƒ Optimal choice for the replacement of linear
transformers and RCC SMPS
Features
„ Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
„ Accurate Constant Current Achieved by Fairchild’s
Proprietary TRUECURRENT^™ Technique
„ Green-Mode Function: PWM Frequency Decreasing
Linearly
„ Fixed PWM Frequency at 42kHz with Frequency
Hopping to Solve EMI Problems
„ Low Startup Current: 10μA (Typical)
„ Low Operating Current: 3.5mA (Typical)
„ Peak-Current-Mode Control
„ Cycle-by-Cycle Current Limiting
„ V_DD Over-Voltage Protection (OVP)
„ V_DD Under-Voltage lockout (UVLO)
„ Gate Output Maximum Voltage Clamped at 18V
„ Fixed Over-Temperature Protection (OTP)
„ Cable Compensation for Tight CV Regulation
(FAN102 / FSEZ1216)
PSR PWM Controller
FAN100
FAN102
FSEZ1016A
FSEZ1216
PSR PWM Controller
FAN100 + Cable Compensation
FAN100 + MOSFET (1A/600V)
FAN102 + MOSFET (1A/600V)
Pin Configurations
Figure 1. FAN100
Figure 2. FAN102
© 2008 Fairchild Semiconductor Corporation
Rev. 1.0.1 • 1/26/10
Figure 3. FSEZ1016A
Figure 4. FSEZ1216
www.fairchildsemi.com