FSBH0170/A FAIRCHILD [Fairchild Semiconductor], FSBH0170/A Datasheet

FSBH0170/A

Manufacturer Part Number

FSBH0170/A

Description

Manufacturer

FAIRCHILD [Fairchild Semiconductor]

Datasheet

1.FSBH0170A.pdf (16 pages)

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FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.1

FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370

Green Mode Fairchild Power Switch (FPS™)

Features

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

Brownout Protection with Hysteresis

Built-In 5ms Soft-Start Function

Internal Avalanche-Rugged 700V SenseFET

No Acoustic Noise During Light-Load Operation

High-Voltage Startup

Linearly Decreasing PWM Frequency to 18KHz

Peak-Current-Mode Control

Cycle-by-Cycle Current Limiting

Leading-Edge Blanking (LEB)

Synchronized Slope Compensation

Internal Open-Loop Protection

Internal Auto-Restart Circuit (OVP, OTP)

Constant Power Limit (Full AC Input Range)

Internal OTP Sensor with Hysteresis

VIN Pin for Pull-HIGH Latch Function and Pull-

LOW Auto-Recovery Protection

Auxiliary Power Supply for PC and Server

SMPS for VCR, SVR, STB, DVD & DVCD Player,

Printer, Facsimile, and Scanner

Adapter for Camcorder

Under-Voltage Lockout (UVLO)

Over-Voltage Protection (OVP)

Description

The highly integrated FSBH-series consists of an

integrated current-mode Pulse Width Modulator (PWM)

and an avalanche-rugged 700V SenseFET. It is

specifically

Switch Mode Power Supplies (SMPS) with minimal

external components.

The integrated PWM controller features include a

proprietary green-mode function that provides off-time

modulation to linearly decrease the switching frequency

at light-load conditions to minimize standby power

consumption. 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. The

PWM controller is manufactured using the BiCMOS

process to further reduce power consumption. The

FSBH-series turns off some internal circuits to improve

power saving when V

an operating current of only 2.5mA.

The FSBH-series has built-in synchronized slope

compensation to achieve stable peak-current-mode

control. The proprietary external line compensation

ensures constant output power limit over a wide AC

input voltage range, from 90V

The FSBH-series provides many protection functions. In

addition to cycle-by-cycle current limiting, the internal

open-loop protection circuit ensures safety when an

open-loop or output short occurs. PWM output is

disabled until V

controller starts up again. As long as V

the internal OVP circuit is triggered.

Compared with a discrete MOSFET and controller or

RCC switching converter solution, the FSBH-series

reduces total component count, design size, and

weight; while increasing efficiency, productivity, and

system reliability. These devices provide a basic

platform that is well suited for the design of cost-

effective flyback converters, such as in PC auxiliary

power supplies.

designed

drops below the V

is lower than 1.6V, which allows

for

high-performance

to 264V

September 2009

TH-OLP

exceeds 28V,

www.fairchildsemi.com

, then the

offline

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