Datasheet > AN-4150

AN-4150

更新时间： 2024-11-14 08:30:39

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		转换器
页数	文件大小	规格书
16页	555K
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Design Guidelines for Flyback Converters

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AN-4150 数据手册

www.fairchildsemi.com

Application Note AN-4150

Design Guidelines for Flyback Converters Using

FSQ-series Fairchild Power Switch (FPS™)

size and weight, while simultaneously increasing efficiency,

1. Introduction

productivity, and system reliability. The FSQ-series employs

an advanced control technique that allows converter to

operate with narrow frequency variation, while keeping the

quasi-resonant operation. When the converter operates in

discontinuous conduction mode (DCM), the controller finds

the valley of the drain voltage and turns on the MOSFET at

the minimum drain voltage. Meanwhile, the converter can

operate with fixed frequency when operating in continuous

conduction mode (CCM), which allows converter design as

simple as conventional PWM converters.

Compared to conventional hard-switched converters with

fixed switching frequencies, the quasi-resonant converter

(QRC) topology is a very attractive alternative for power

supply designers. The increasing popularity of the QRC

approach is based on its ability to reduce electromagnetic

interference (EMI) while increasing power conversion

efficiency.

The FSQ-series FPS™ (Fairchild Power Switch) is an

integrated Pulse Width Modulation (PWM) controller and

Sense FET specifically designed for quasi-resonant off-line

Switch Mode Power Supplies (SMPS) with minimal external

components. Figure 1 shows the internal block diagram of

the FSQ-series. Compared with discrete MOSFET and PWM

controller solution, it can reduce total cost, component count,

This application note presents practical design consider-

ations of a flyback converter employing the FSQ-series

FPS™. It covers designing the transformer, output filter, and

sync network; selecting the components; and closing the

feedback loop.

Drain

V_str

V_cc

Sync

OSC

0.7V/0.2V

V_ref

0.35/0.55V

V_Burst

V_ref

V_CCgood

V_CC

8V/12V

I_FB

PWM

I_delay

Gate

driver

Soft-

Start

LEB

200ns

LPF

RC=80ns

AOCP

TSD

GND

V_OCP

(1.1V)

V_SD

2.5μs time

delay

Sync

V_ovp

V_ccgood

Figure 1. Block Diagram of FSQ-Series

FSQ-Series Rev. 1.0.0 10/23/06

www.fairchildsemi.com

12 3 4 5 6 7...16

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