lm5034mtcx National Semiconductor Corporation, lm5034mtcx Datasheet

lm5034mtcx

Manufacturer Part Number

lm5034mtcx

Description

High Voltage Dual Interleaved Current Mode Controller With Active Clamp

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM5034MTCX.pdf (29 pages)

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LM5034

High Voltage Dual Interleaved Current Mode Controller

with Active Clamp

General Description

The LM5034 dual current mode PWM controller contains all

the features needed to control either two independent

forward/active clamp dc/dc converters or a single high cur-

rent converter comprised of two interleaved power stages.

The two controller channels operate 180˚ out of phase

thereby reducing input ripple current. The LM5034 includes a

startup regulator that operates over a wide input range up to

100V and compound (bipolar + CMOS) gate drivers that

provide a robust 2.5A peak sink current. The adjustable

dead-time of the active clamp gate drivers and adjustable

maximum PWM duty cycle reduce stress on the primary side

MOSFET switches. Additional features include program-

mable line under-voltage lockout, cycle-by-cycle current

limit, hiccup mode fault operation with adjustable restart

delay, PWM slope compensation, soft-start, and a 2 MHz

capable oscillator with synchronization capability.

Typical Application Circuit

Dual Interleaved Regulators with Independent Outputs

DS201368

Features

n Two independent PWM current mode controllers

n Integrated high voltage startup regulator

n Compound 2.5A main output gate drivers

n Single resistor oscillator setting to 2 MHz

n Synchronizable oscillator

n Active clamp gate driver for P-channel MOSFETs

n Adjustable gate drive overlap time

n Programmable maximum duty cycle

n Maximum duty cycle fold-back at high line voltage

n Adjustable timer for hiccup mode current limiting

n Integrated slope compensation

n Adjustable line under-voltage lockout

n Independently adjustable soft-start (each regulator)

n Direct interface with opto-coupler transistor

n Thermal shutdown

Applications

n Telecommunication Power Converters

n Industrial Power Converters

n +42V Automotive Systems

Packages

n TSSOP-20

20136801

February 2005

www.national.com

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