OUT

CS

SS

FB

COMP

/

UVLO

VIN

VCC

COMPENSATION

GND

SM74202

RT SYNC

SM74202

www.ti.com

SNOSBA4A – NOVEMBER 2011 – REVISED APRIL 2013

100V Current Mode PWM Controller

Check for Samples: SM74202

1

FEATURES

DESCRIPTION

The SM74202 high voltage pulse-width-modulation

2

•

Renewable Energy Grade

(PWM) controller contains all of the features needed

•

Internal Start-up Bias Regulator

to implement single ended primary power converter

•

Error Amplifier

topologies. Output voltage regulation is based on

current-mode control, which eases the design of loop

•

Precision Voltage Reference

compensation while providing inherent line feed-

•

Programmable Softstart

forward. The SM74202 includes a high-voltage start-

•

1A Peak Gate Driver

up regulator that operates over a wide input range up

to 100V. The PWM controller is designed for high

•

Maximum Duty Cycle Limiting (50%)

speed capability including an oscillator frequency

•

Programmable Line Under Voltage Lockout

range to 1MHz and total propagation delays less than

(UVLO) with Adjustable Hysteresis

100ns. Additional features include an error amplifier,

•

Cycle-by-Cycle Over-Current Protection

precision reference, line under-voltage lockout, cycle-

by-cycle current limit, slope compensation, softstart,

•

Programmable Oscillator Frequency with

oscillator

synchronization

capability

and

thermal

Synchronization Capability

shutdown. The controller is available in the MSOP-10

•

Current Sense Leading Edge Blanking

package.

•

Thermal Shutdown Protection

APPLICATIONS

•

Photovoltaic

•

Telecommunication Power Converters

•

Industrial Power Converters

•

+42V Automotive Systems

Typical Application Circuit

Figure 1. Non-Isolated Flyback Converter

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.