T1

CS

36 - 78V

3.3V

SYNC I/O

LM5026

UVLO

PGND AGND

COMP

OUT_A

OUT_B

SS

RT

SYNC

REF

TIME

RES

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DCL

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Design

LM5026

SNVS363E – AUGUST 2005 – REVISED NOVEMBER 2015

LM5026 Active Clamp Current Mode PWM Controller

1 Features

3 Description

The LM5026 PWM controller contains all of the

1

•

Current-Mode Control

features necessary to implement power converters

•

Internal 100-V Start-Up Bias Regulator

utilizing the active clamp and reset technique with

•

3-A Compound Main Gate Driver

current-mode

control.

With

the

active

clamp

technique, higher efficiencies and greater power

•

High Bandwidth Optocoupler Interface

densities can be realized compared to conventional

•

Programmable Line Undervoltage Lockout (UVLO)

catch winding or RDC clamp and reset techniques.

With Adjustable Hysteresis

Two control outputs are provided, the main power

•

Versatile Dual Mode Overcurrent Protection With

switch control (OUT_A) and the active clamp switch

Hiccup Delay Timer

control (OUT_B). The device can be configured to

control either a P-Channel or N-Channel clamp

•

Programmable Overlap or Deadtime between the

switch. The main gate driver features a compound

Main and Active Clamp Outputs

configuration, consisting of both MOS and Bipolar

•

Programmable Maximum Duty Cycle Clamp

devices, providing superior gate drive characteristics.

•

Programmable Soft-Start

The LM5026 can be configured to operate with bias

voltages over a wide input range of 8 V to 100 V.

•

Leading Edge Blanking

Additional features include programmable maximum

•

Resistor Programmed 1-MHz Capable Oscillator

duty cycle, line undervoltage lockout, cycle-by-cycle

•

Oscillator Sync I/O Capability

current

limit,

hiccup

mode

fault

operation

with

adjustable timeout delay, PWM slope compensation,

•

Precision 5-V Reference

soft-start,

1-MHz

capable

oscillator

with

synchronization input and output capability, precision

2 Applications

reference, and thermal shutdown.

•

Server Power Supplies

•

48-V Telecom Power Supplies

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

High Efficiency DC–DC Power Supplies

WSON (16)

5.00 mm × 5.00 mm

LM5026

TSSOP (16)

4.40 mm × 5.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.