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FAN102

Primary-Side-Control PWM Controller

Fairchild Semiconductor 

April 2009

FAN102

Primary-Side-Control PWM Controller

Features

ƒ Constant-Voltage (CV) and Constant-Current (CC)

Control without Secondary-Feedback Circuitry

ƒ Green Mode: Frequency Reduction at Light Load

ƒ Fixed PWM Frequency at 42kHz with Frequency

Hopping to Reduce EMI

ƒ Cable Voltage Drop Compensation in CV Mode

ƒ Low Startup Current: 10μA

ƒ Low Operating Current: 3.5mA

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 18V

ƒ Fixed Over-Temperature Protection with Auto-

Restart

ƒ SOP-8 Package Available

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

Description

The primary-side PWM controller significantly simplifies

power supply design that requires CV and CC regulation

capabilities. The FAN102 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 all 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 FAN102 can reduce total cost,

component count, size, and weight; while

simultaneously increasing efficiency, productivity, and

system reliability.

A typical output CV/CC characteristic envelope is shown

in Figure 1.

Figure 1. Typical Output V-I Characteristic

Ordering Information

Part Number

Operating

Temperature Range

FAN102MY

-40°C to +105°C

Eco Status

Package

Green

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.

© 2008 Fairchild Semiconductor Corporation

FAN102 Rev. 1.0.3

www.fairchildsemi.com

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