LT1952IGN Linear Technology, LT1952IGN Datasheet

LT1952IGN

Manufacturer Part Number

LT1952IGN

Description

IC,SMPS CONTROLLER,CURRENT-MODE,SOP,16PIN,PLASTIC

Manufacturer

Linear Technology

Datasheets

1.LT1952IGN.pdf (24 pages)

2.LT1952IGN.pdf (24 pages)

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Current page: 1 of 24
Download datasheet (253Kb)

APPLICATIO S

FEATURES

■

TYPICAL APPLICATIO

Synchronous Rectifier Control for High Efficiency

Programmable Volt-Second Clamp

Output Power Levels from 25W to 500W

Low Current Start-Up

True PWM Soft-Start

Low Stress Short Circuit Protection

Precision 100mV Current Limit Threshold

Adjustable Delay for Synchronous Timing

Accurate Shutdown Threshold with Programmable

Hysteresis

Programmable Slope Compensation

Programmable Leading Edge Blanking

Programmable Frequency (100kHz to 500kHz)

Synchronizable to an External Clock up to 1.5 • f

Internal 1.23V Reference

2.5V External Reference

Current Mode Control

Small 16-Pin SSOP Package

Telecommunications Power Supplies

Industrial and Distributed Power

Isolated and Non-Isolated DC/DC Converters

0.1µF

52.3k

100k

13k

36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter

340k

COMP

SS_MAXDC

SD_V

SYNC

GND

PGND

REF

SUPPLY FROM BIAS

WINDING OF T1

SEC

BLANK DELAY

LT1952

40k

SENSE

SOUT

OUT

OSC

40k

178k

10µF

220pF

Si7450

0.005Ω

PA0905

OSC

560Ω

Si7370

×2

SYNC

LTC3900

DESCRIPTIO

The LT

to control the forward converter topology, using one

primary MOSFET. The LT1952 provides synchronous

rectifier control, resulting in extremely high efficiency. A

programmable Volt-Second clamp provides a safeguard

for transformer reset that prevents saturation. This allows

a single MOSFET on the primary side to reliably run at

greater than 50% duty cycle for high MOSFET, trans-

former and rectifier utilization. The LT1952 includes

soft-start for controlled exit from shutdown, overcurrent

conditions and undervoltage lockout. A precision 100mV

current limit threshold, independent of duty cycle, com-

bines with soft-start to provide hiccup short circuit protec-

tion. Micropower start-up allows the LT1952 to be effi-

ciently started from high input voltages. Programmable

slope compensation and leading edge blanking allow

optimization of loop bandwidth with a wide range of

inductors and MOSFETs. The LT1952 can be programmed

over a 100kHz to 500kHz frequency range and the part can

be synchronized to an external clock. The error amplifier

is a true op amp, allowing a wide range of compensation

networks. The LT1952 is available in a small 16-pin SSOP

package.

Single Switch Synchronous

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

PA1494.242

PH4840

×2

1952 is a current mode PWM controller optimized

1952 TA01

47µF

16V

X5R

×2

12V

20A

OUT

Forward Controller

12V Bus Converter

OUT

vs V

(V)

LT1952

1952 TA01b

1952f

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