1FEATURES

2? Internal Start-up Bias Regulator

? Error Amplifier

? Precision Voltage Reference

? Programmable Softstart

? 1A Peak Gate Driver

? Maximum Duty Cycle Limiting (80% for

LM5020-1 or 50% for LM5020-2)

? Programmable Line Under Voltage Lockout

(UVLO) with Adjustable Hysteresis

? Cycle-by-Cycle Over-Current Protection

? Slope Compensation (LM5020-1)

? Programmable Oscillator Frequency with

Synchronization Capability

? Current Sense Leading Edge Blanking

? Thermal Shutdown Protection

APPLICATIONS

? Telecommunication Power Converters

? Industrial Power Converters

? +42V Automotive Systems

PACKAGES

? VSSOP-10

? WSON-10 (4 mm x 4 mm)

DESCRIPTION

The LM5020 high voltage pulse-width-modulation (PWM) controller contains all of the features needed

to implement single ended primary power converter

topologies. Output voltage regulation is based on

current-mode control, which eases the design of loop

compensation while providing inherent line feedforward.

The LM5020 includes a high-voltage start-up

regulator that operates over a wide input range up to

100V. The PWM controller is designed for high speed

capability including an oscillator frequency range to

1MHz and total propagation delays less than 100ns.

Additional features include an error amplifier,

precision reference, line under-voltage lockout, cycle-

by-cycle current limit, slope compensation, softstart,

oscillator synchronization capability and thermal

shutdown. The controller is available in both VSSOP-

10 and WSON-10 packages.