LM5041A

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SNVS350B – MARCH 2005 – REVISED MARCH 2013

LM5041A Cascaded PWM Controller

Check for Samples: LM5041A

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FEATURES

DESCRIPTION

The LM5041A PWM controller contains all of the

•

Internal Start-up Bias Regulator

features necessary to implement either current-fed or

•

Programmable Line Under-Voltage Lockout

voltage-fed push-pull or bridge power converters.

(UVLO) with Adjustable Hysteresis

These “Cascaded” topologies are well suited for

•

Current Mode Control

multiple output and higher power applications. The

LM5041A’s four control outputs include: the buck

•

Internal Error Amplifier with Reference

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

•

Cycle-by-cycle Over-Current Protection

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

•

Leading Edge Blanking

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

switching frequency of the buck stage and can be

•

Programmable Push-Pull Overlap or Dead

configured for either an overlap time (for current-fed

Time

applications) or a both-off time (for voltage-fed

•

Internal 1.5A Push-Pull Gate Drivers

applications). Push-pull stage MOSFETs can be

•

Programmable Soft-Start

driven directly from the internal gate drivers while the

buck stage requires an external driver such as the

•

Programmable Oscillator with Sync Capability

LM5102. The LM5041A includes a high-voltage start-

•

Precision Reference

up regulator that operates over a wide input range of

•

Thermal Shutdown

15V to 100V. The PWM controller is designed for

high-speed

capability

including

an

oscillator

frequency range up to 1 MHz and total propagation

APPLICATIONS

delays of less than 100ns. Additional features include:

•

Telecommunication Power Converters

line Under-Voltage Lockout (UVLO), soft-start, an

•

Industrial Power Converters

error amplifier, precision voltage reference, and

thermal shutdown.

•

Multi-Output Power Converters

•

+42V Automotive Systems

The two differences between the LM5041 and the

LM5041A are: No second level current limit in the 'A'

version No softstart (SS) shutdown comparator in the

'A' version.

PACKAGES

•

TSSOP-16

•

WSON-16 (5 mm × 5 mm) Thermally Enhanced

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

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2013, 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.