LM5041

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SNVS248D – AUGUST 2003 – REVISED MARCH 2013

LM5041 Cascaded PWM Controller

Check for Samples: LM5041

1

FEATURES

PACKAGES

2

•

Internal Start-up Bias Regulator

•

TSSOP-16

•

Programmable Line Under-Voltage Lockout

•

WSON-16 (5x5 mm) Thermally Enhanced

(UVLO) with Adjustable Hysteresis

DESCRIPTION

•

Current Mode Control

The LM5041 PWM controller contains all of the

•

Internal Error Amplifier with Reference

features necessary to implement either current-fed or

•

Dual Mode Over-Current Protection

voltage-fed push-pull or bridge power converters.

•

Leading Edge Blanking

These “Cascaded” topologies are well suited for

multiple output and higher power applications. The

•

Programmable Push-Pull Overlap or Dead

LM5041’s four control outputs include: the buck stage

Time

controls (HD and LD) and the push-pull control

•

Internal 1.5A Push-Pull Gate Drivers

outputs (PUSH and PULL). Push-pull outputs are

•

Programmable Soft-start

driven at 50% nominal duty cycle at one half of the

switching frequency of the buck stage and can be

•

Programmable Oscillator with Sync Capability

configured for either a specified overlap time (for

•

Precision Reference

current-fed applications) or a specified both-off time

•

Thermal Shutdown

(for

voltage-fed

applications).

Push-pull

stage

MOSFETs can be driven directly from the internal

gate drivers while the buck stage requires an external

APPLICATIONS

driver such as the LM5102. The LM5041 includes a

•

Telecommunication Power Converters

high-voltage start-up regulator that operates over a

•

Industrial Power Converters

wide input range of 15V to 100V. The PWM controller

is designed for high-speed capability including an

•

Multi-Output Power Converters

oscillator frequency range up to 1 MHz and total

•

+42V Automotive Systems

propagation delays of less than 100ns. Additional

features include: line Under-Voltage Lockout (UVLO),

soft-start,

an

error

amplifier,

precision

voltage

reference, and thermal shutdown.

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2003–2013, 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.