LT1950 Linear Technology, LT1950 Datasheet

LT1950

Manufacturer Part Number

LT1950

Description

Single Switch PWM Controller

Manufacturer

Linear Technology

Datasheet

1.LT1950.pdf (20 pages)

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Download datasheet (302Kb)

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FEATURES

APPLICATIO S

TYPICAL APPLICATIO

Wide Input Range: 3V to 25V

Programmable Volt-Second Clamp

Output Power Levels from 25W to 500W

Auxiliary Boost Converter Provides 10V Gate Drive

from V

Programmable Operating Frequency (100kHz to

500kHz) with One External Resistor

Programmable Slope Compensation

Programmable Leading Edge Blanking

Accurate Shutdown Pin Threshold with

Programmable Hysteresis

60ns Current Sense Delay

2.5V Auxiliary Reference Output

Synchronizable to an External Clock up to 1.5 • f

Current Mode Control

Small 16-Pin SSOP Package

Telecom Power Supplies

Automotive Power Supplies

Portable Electronic Equipment

Isolated and Nonisolated DC/DC Converters

2% Internal 1.23V Reference

2.5V

249k

4.99k

0.1 F

as Low as 3V

36V to 72V DC to 26V/5A (Single Switch) Forward Converter

SLOPE

BOOST

BLANK

SYNC

GND

REF

OSC

LT1950

COMP

SHDN

SENSE

PGND

GATE

SEC

IN2

4.7k

10V

BIAS

0.022 F

1 F

470k

18k

100k

Si7450

0.015

MBRB20200

OSC

47 H

47 F

DESCRIPTIO

The LT

and SEPIC controller that drives an N-channel power

MOSFET with few external components required.

A resistor programmable duty cycle clamp can be used to

generate a volt-second clamp for forward converter appli-

cations. An internal boost switcher is available for creating

a separate supply for the output gate driver, allowing 10V

gate drive from input voltages as low as 3V. The LT1950’s

operating frequency can be set with an external resistor

over a 100kHz to 500kHz range and a SYNC pin allows the

part to be synchronized to an external clock. Additional

programmability exists for leading edge blanking and

slope compensation.

A fast current sense comparator achieves 60ns current

sense delay and the error amplifier is a true voltage mode

error amplifier, allowing a wide range of compensation

networks. An accurate shutdown pin with programmable

hysteresis is available for undervoltage lockout and shut-

down. The LT1950 is available in a small 16-Pin SSOP

package.

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

1950 TA01a

Controller with Auxiliary

1950 is a wide input range, forward, boost, flyback

26V

OUT

Single Switch PWM

0.5

Boost Converter

Efficiency vs Load Current

1.5

LOAD CURRENT (A)

2.5

= 72V

= 48V

3.5

= 36V

LT1950

4.5

sn1950 1950fs

1950 TA01b

5.5

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