1FEATURES

2? Internal Start-up Bias Regulator

? Programmable Line Under-Voltage Lockout

(UVLO) with Adjustable Hysteresis

? Current Mode Control

? Internal Error Amplifier with Reference

? Dual Mode 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

PACKAGES

? TSSOP-16

? WSON-16 (5x5 mm) Thermally Enhanced

DESCRIPTION

The LM5041 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

LM5041’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 a specified overlap time (for

current-fed applications) or a specified 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 LM5041 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.