FAN100_09 Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Primary-Side-Control PWM Controller

June 2009
FAN100
Primary-Side-Control PWM Controller
Features
ƒ Constant-Voltage (CV) and Constant-Current (CC)
Control without Secondary-Feedback Circuitry
ƒ Accurate Constant Current Achieved by Fairchild’s
Proprietary TRUECURRENT™ Technique
ƒ Green Mode: Frequency Reduction at Light Load
ƒ Fixed PWM Frequency at 42kHz with Frequency
Hopping to Reduce EMI
ƒ Low Startup Current: 10μA Maximum
ƒ Low Operating Current: 3.5mA
ƒ Peak-Current-Mode Control in CV Mode
ƒ Cycle-by-Cycle Current Limiting
ƒ Over-Temperature Protection with Auto-Restart
ƒ Brownout Protection with Auto-Restart
ƒ VDD Over-Voltage Protection with Auto-Restart
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Gate Output Maximum Voltage Clamped at 18V
ƒ SOP-8 Package
Description
The primary-side PWM controller FAN100 significantly
simplifies power supply design that requires CV and CC
regulation capabilities. The FAN100 controls the output
voltage and current precisely with the information in the
primary side of the power supply, not only removing the
output current sensing loss, but eliminating secondary
feedback circuitry.
The green-mode function with a low startup current
(10µA) maximizes the light-load efficiency so the power
supply can meet stringent standby power regulations.
Compared with a conventional secondary-side
regulation approach, the FAN100 can reduce total cost,
component count, size, and weight; while
simultaneously increasing efficiency, productivity, and
system reliability.
FAN100 controller is available in an 8-pin SOP package.
A typical output CV/CC characteristic envelope is shown
in Figure 1.
Applications
ƒ Battery Chargers for Cellular Phones, Cordless
Phones, PDA, Digital Cameras, Power Tools
ƒ Replaces Linear Transformer and RCC SMPS
ƒ Offline High Brightness (HB) LED Drivers
Related Resources
ƒ AN-6067 — Design Guide for FAN100/102 and
FSEZ1016A/1216
Figure 1. Typical Output V-I Characteristic
Ordering Information
Part Number
Operating
Temperature Range
FAN100MY
-40°C to +125°C
Eco Status
Green
Package
8-Lead, Small Outline
Package (SOP-8)
Packing Method
Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN100 Rev. 1.0.2
www.fairchildsemi.com