OUT

CS

SS

FB

COMP

/

UVLO

VIN

VCC

COMPENSATION

GND

LM5020

RT SYNC

LM5020

www.ti.com

SNVS275F – MAY 2004 – REVISED APRIL 2006

LM5020 100V Current Mode PWM Controller

Check for Samples: LM5020

1

FEATURES

PACKAGES

2

•

Internal Start-up Bias Regulator

•

VSSOP-10

•

Error Amplifier

•

WSON-10 (4 mm x 4 mm)

•

Precision Voltage Reference

DESCRIPTION

•

Programmable Softstart

The LM5020 high voltage pulse-width-modulation

•

1A Peak Gate Driver

(PWM) controller contains all of the features needed

•

Maximum Duty Cycle Limiting (80% for

to implement single ended primary power converter

LM5020-1 or 50% for LM5020-2)

topologies. Output voltage regulation is based on

current-mode control, which eases the design of loop

•

Programmable Line Under Voltage Lockout

compensation while providing inherent line feed-

(UVLO) with Adjustable Hysteresis

forward. The LM5020 includes a high-voltage start-up

•

Cycle-by-Cycle Over-Current Protection

regulator that operates over a wide input range up to

•

Slope Compensation (LM5020-1)

100V. The PWM controller is designed for high speed

capability including an oscillator frequency range to

•

Programmable Oscillator Frequency with

1MHz and total propagation delays less than 100ns.

Synchronization Capability

Additional

features

include

an

error

amplifier,

•

Current Sense Leading Edge Blanking

precision reference, line under-voltage lockout, cycle-

•

Thermal Shutdown Protection

by-cycle current limit, slope compensation, softstart,

oscillator

synchronization

capability

and

thermal

shutdown. The controller is available in both VSSOP-

APPLICATIONS

10 and WSON-10 packages.

•

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 © 2004–2006, 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.