LTC3722-1 LINER [Linear Technology], LTC3722-1 Datasheet

LTC3722-1

Manufacturer Part Number

LTC3722-1

Description

Synchronous Dual Mode Phase Modulated Full Bridge Controllers

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC3722-1.pdf (28 pages)

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FEATURES

APPLICATIO S

TYPICAL APPLICATIO

Adaptive or Manual Delay Control for Zero Voltage

Switching Operation

Adjustable Synchronous Rectification Timing for

Highest Efficiency

Adjustable Maximum ZVS Delay

Adjustable System Undervoltage Lockout and

Hysteresis

Programmable Leading Edge Blanking

Very Low Start-Up and Quiescent Currents

Current Mode (LTC3722-1) or Voltage Mode

(LTC3722-2) Operation

Programmable Slope Compensation

50mA Output Drivers

Soft-Start, Cycle-by-Cycle Current Limiting and

Hiccup Mode Short-Circuit Protection

5V, 15mA Low Dropout Regulator

Telecommunications, Infrastructure Power Systems

Distributed Power Architectures

Server Power Supplies

36V TO 72V

U1, U2: LTC1693-1 DUAL GATE DRIVER

UVLO and 25mA Shunt Regulator

LTC3722

1/2

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

RCS

1/2

3722 • TA01A

DESCRIPTIO

The LTC

provide all of the control and protection functions neces-

sary to implement a high efficiency, zero voltage switched

(ZVS), full bridge power converter. Adaptive ZVS circuitry

delays the turn-on signals for each MOSFET independent

of internal and external component tolerances. Manual

delay set mode enables secondary side control operation

or direct control of switch turn-on delays.

The LTC3722-1/LTC3722-2 feature adjustable synchro-

nous rectifier timing for optimal efficiency. A UVLO pro-

gram input provides accurate system turn-on and turn-off

voltages. The LTC3722-1 features peak current mode

control with programmable slope compensation and lead-

ing edge blanking, while the LTC3722-2 employs voltage

mode control with voltage feedforward capability.

The LTC3722-1/LTC3722-2 feature extremely low operat-

ing and start-up currents. Both devices include a full range

of protection features and are available in the 24-pin

surface mount (GN) package.

12V

, LTC and LT are registered trademarks of Linear Technology Corporation.

OUT

Synchronous Dual Mode

3722-1/LTC3722-2 phase shift PWM controllers

Full Bridge Controllers

LTC3722-1/LTC3722-2

12V

Phase Modulated

OUT

36V

Final Electrical Specifications

, 240W Converter Efficiency

72V

CURRENT (A)

48V

February 2003

3722 TA01b

372212i

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