FAN501A Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Offline DCM / CCM Flyback PWM Controller for Charger Applications

April 2014
FAN501A
Offline DCM / CCM Flyback PWM Controller for
Charger Applications
Features
 WSaver® Technology Provides Ultra-Low
Standby Power Consumption for Energy Star’s
5-Star Level (<30 mW)
 Constant-Current (CC) Control without
Secondary-Side Feedback Circuitry for
Discontinuous Conduction Mode (DCM) and
Continuous Conduction Mode (CCM)
 Dual-Frequency Function Changes Switching
Frequency (140 kHz / 85 kHz) According to Input
Voltage to Maximize Transformer Utilization and
Improve Efficiency
 High Power Density and High Conversion
Efficiency in CCM Compact Charger Applications
 Frequency Hopping to Reduce EMI Noise
 High-Voltage Startup
 Precise Maximum Output Power Limit by CC
Regulation through External Resistor Adjustment
 Peak-Current-Mode Control with Slope
Compensation to Avoid Sub-Harmonic Oscillation
 Programmable Over-Temperature Protection with
Latch Mode through External NTC Resistor
 Two-Level UVLO Reduces Input Power in Output
Short Situation
 VS Over-Voltage Protection with Latch Mode
 VDD Over-Voltage Protection with Auto Restart
 Available in MLP 4 X 3 Package
Description
The advanced PWM controller, FAN501A, simplifies
isolated power supply design that requires CC
regulation of the output. The output current is
precisely estimated with only the information in the
primary side of the transformer and controlled with an
internal compensation circuit, removing the output
current-sensing loss and eliminating external CC
control circuitry. With an extremely low operating
current (250 µA), Burst Mode maximizes light-load
efficiency, allowing conformance to worldwide
Standby Mode efficiency guidelines.
Compared with a conventional approach using
external control circuit in the secondary side for CC
regulation, the FAN501A can reduce total cost,
component count, size, and weight; while increasing
efficiency, productivity, and system reliability.
Vo
Maximum
Typical
Minimum
Figure 1.
Io
Typical Output V-I Characteristic
Applications
 Battery Chargers for Smart Phones, Feature
Phones, and Tablet PCs
 AC-DC Adapters for Portable Devices or Battery
Chargers that Require CV / CC Control
Ordering Information
Part Number
FAN501AMPX
Operating
Temperature Range
-40C to +125C
Package
10-Lead, MLP, QUAD, JEDEC MO-220 4 mm x 3 mm,
0.8 mm Pitch, Single DAP
Packing
Method
Tape & Reel
© 2014 Fairchild Semiconductor Corporation
FAN501A • Rev. 1.0.0
www.fairchildsemi.com