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1FEATURES

? Internal Start-up Bias Regulator

? Programmable Line Under-Voltage Lockout

(UVLO) with Adjustable Hysteresis

? Current Mode Control

? Internal Error Amplifier with Reference

? Cycle-by-cycle Over-Current Protection

? Leading Edge Blanking

? Programmable Push-Pull Overlap or Dead

Time

? Internal 1.5A Push-Pull Gate Drivers

? Programmable Soft-Start

? Programmable Oscillator with Sync Capability

? Precision Reference

? Thermal Shutdown

APPLICATIONS

? Telecommunication Power Converters

? Industrial Power Converters

? Multi-Output Power Converters

? +42V Automotive Systems

DESCRIPTION

The LM5041A PWM controller contains all of the

features necessary to implement either current-fed or

voltage-fed push-pull or bridge power converters.

These “Cascaded” topologies are well suited for

multiple output and higher power applications. The

LM5041A’s four control outputs include: the buck

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

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

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

switching frequency of the buck stage and can be

configured for either an overlap time (for current-fed

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

applications). Push-pull stage MOSFETs can be

driven directly from the internal gate drivers while the

buck stage requires an external driver such as the

LM5102. The LM5041A includes a high-voltage start- up regulator that operates over a wide input range of

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

high-speed capability including an oscillator

frequency range up to 1 MHz and total 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.

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