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FSEZ1317A

Primary-Side-Regulation PWM with POWER MOSFET Integrated

Fairchild Semiconductor 

January 2011

FSEZ1317A

Primary-Side-Regulation PWM with POWER MOSFET

Integrated

Features

 Low Standby Power Under 30mW

 High-Voltage Startup

 Fewest External Component Counts

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

Control without Secondary-Feedback Circuitry

 Green-Mode: Linearly Decreasing PWM Frequency

 Fixed PWM Frequency at 50kHz with Frequency

Hopping to Solve EMI Problem

 Cable Compensation in CV Mode

 Peak-Current-Mode Control in CV Mode

 Cycle-by-Cycle Current Limiting

 VDD Over-Voltage Protection with Auto Restart

 VDD Under-Voltage Lockout (UVLO)

 Gate Output Maximum Voltage Clamped at 15V

 Fixed Over-Temperature Protection with

Auto Restart

 Available in the 7-Lead SOP Package

Description

This third-generation Primary-Side-Regulation (PSR)

and highly integrated PWM controller provides several

features to enhance the performance of low-power

flyback converters. The proprietary topology,

TRUECURRENT®, of FSEZ1317A enables precise CC

regulation and simplified circuit design for battery-

charger applications. A low-cost, smaller, and lighter

charger results, as compared to a conventional design

or a linear transformer.

To minimize standby power consumption, the

proprietary green mode provides off-time modulation to

linearly decrease PWM frequency under light-load

conditions. Green mode assists the power supply in

meeting power conservation requirements.

By using the FSEZ1317A, a charger can be

implemented with few external components and

minimized cost. A typical output CV/CC characteristic

envelope is shown in Figure 1.

Applications

 Battery chargers for cellular phones, cordless

phones, PDA, digital cameras, power tools, etc.

 Replaces linear transformers and RCC SMPS

Figure 1. Typical Output V-I Characteristic

Ordering Information

Part Number

FSEZ1317AMY_F116

Operating

Temperature Range

-40°C to +105°C

Package

7-Lead, Small Outline Package (SOP-7)

Packing

Method

Tape & Reel

© 2010 Fairchild Semiconductor Corporation

FSEZ1317A • Rev. 1.0.1

www.fairchildsemi.com

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