Datasheet > FAN6751

FAN6751

更新时间： 2024-09-27 10:28:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
13页	493K
描述
Highly Integrated Green-Mode PWM Controller

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FAN6751 数据手册

www.fairchildsemi.com

AN-6073

FAN6751 — Highly Integrated Green-Mode PWM Controller

Internal Open-loop Protection

Introduction

GATE Output Maximum Voltage Clamp: 18V

V_DDUnder-Voltage Lockout (UVLO)

V_DDOver-Voltage Protection (OVP)

Internal Recovery Circuit (OVP, OLP)

Internal Sense Short-Circuit Protection

External Constant Power Limit (Full AC Input Range)

Internal OTP Sensor with Hysteresis

Built-in 5ms Soft-Start Function

This application note describes a detailed design strategy for

a high-efficiency, compact flyback converter. Design

considerations and mathematical equations are presented as

well as guidelines for a printed circuit board layout. The

highly integrated FAN6751 series of PWM controllers

provides several features to enhance the performance for

LCDM/TV, NB, and adapters.

The green-mode function includes off-time modulation and

burst mode to reduce the PWM frequency at light-load and

in no-load conditions. To avoid acoustic noise problems, the

minimum PWM frequency is set above 18KHz. This green-

mode function enables the power supply to meet

international power conservation requirements. With the

internal high-voltage startup circuitry, the power loss due to

bleeding resistors is also eliminated. Built-in synchronized

slope compensation achieves stable peak-current-mode

control. The proprietary external line compensation ensures

constant output power limit over a wide AC input voltage

Built-in VIN Pin Pull HIGH (> 4.7V) Recovery

Function for Second-Side Output OVP

Brownout Protection with Hysteresis

Applications

General-purpose, switch-mode power supplies and flyback

power converters, including:

range, from 90V_ACto 264V_AC

Power Adapters

Open-frame SMPS

LCD Monitor/TV

FAN6751 provides many protection functions, as shown in

Table 1. In addition to cycle-by-cycle current limiting, the

internal open-loop protection circuit ensures safety should

an open-loop or output short-circuit failure occur.

SOP-8

Features

High-Voltage Startup

GND

GATE

VDD

Low Operating Current: 4mA

Linearly Decreasing PWM Frequency to 18KHz

Fixed PWM Frequency: 65KHz

Peak-Current-Mode Control

SENSE

VIN

Cycle-by-Cycle Current Limiting

Leading-Edge Blanking (LEB)

Synchronized Slope Compensation

Figure 1. Pin Configuration (Top View)

Table 1. Protection Functions of FAN6751 Series

Pull-High

Protection (V_IN)

OTP

(Internal)

SCP

(SENSE)

PWM

Frequency

Part Number

OVP (V_DD)

OLP (FB)

FAN6751MRMY

FAN6751HLMY

Recovery

Latch

Recovery

Latch

Recovery

Latch

Recovery

65KHz

100KHz

Rev. 1.0.0 • 9/26/08

www.fairchildsemi.com

12 3 4 5 6 7...13

中文翻译

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与FAN6751相关器件

型号	品牌	获取价格	描述	数据表
FAN6751HLMY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
FAN6751MR	FAIRCHILD	获取价格	Highly-Integrated Green-Mode PWM Controller
FAN6751MRMY	FAIRCHILD	获取价格	Highly-Integrated Green-Mode PWM Controller
FAN6753	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
FAN6753_11	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
FAN6753MY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
FAN6753NY	FAIRCHILD	获取价格	Switching Controller, Current-mode, 68kHz Switching Freq-Max, BICMOS, PDIP8, GREEN, MS-001
FAN6754	FAIRCHILD	获取价格	Highly Integrated Green- Mode PWM Controller
FAN6754_09	FAIRCHILD	获取价格	Highly Integrated Green- Mode PWM Controller
FAN6754_10	FAIRCHILD	获取价格	Highly Integrated Green- Mode PWM Controller

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