AN-400A Datasheet, PDF (1/8 Pages) Fairchild Semiconductor – Low-Power Green-Mode PWM Flyback Power Controller

www.fairchildsemi.com
AN-400A
Low-Power Green-Mode PWM Flyback Power Controller
without Secondary Feedback
Abstract
This highly integrated PWM controller, FAN400A, offers
several features to enhance the performance of a flyback
converter for low-power applications. Using the controller
reduces the costs of battery chargers and AC adapters. The
no-load power consumption can be less than 200mW for
universal AC input voltage range to meet the power
conservation requirements.
Features
ƒ Linearly Decreasing PWM Frequency
ƒ Green Mode Under Light-load and Zero-load Conditions
ƒ Constant Voltage (CV) and Constant Current (CC)
ƒ No Secondary Feedback
ƒ Low Startup Current: 8μA
ƒ Low Operating Current: 3.6mA
ƒ Leading-edge Blanking
ƒ Constant Power Limit
ƒ Universal AC Input Range
ƒ Synchronized Slope Compensation
ƒ 140°C OTP Sensor with Hysteresis
ƒ V_DD Over-Voltage Clamping
ƒ Cycle-by-cycle Current Limiting
ƒ Under voltage lockout (UVLO)
ƒ Fixed PWM Frequency with Hopping
ƒ Gate Output Maximum Voltage Clamped at 17V
ƒ Small SOT-26 Package
GND
FB
NC
GATE
VDD
SENSE
Figure 1. SOT-26 Pin Configuration
GATE
VDD
NC
SENSE
GND
FB
NC
NC
Figure 2. DIP-8 Pin Configuration
© 2008 Fairchild Semiconductor Corporation
Rev. 1.0.0 • 5/29/08
www.fairchildsemi.com