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)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LT1952IGN

Manufacturer:

Quantity:

10 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT1952IGN

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT1952IGN#PBF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LT1952IGN#TRPBF

Manufacturer:

MAX

Quantity:

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT1952IGN#TRPBF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LT1952IGN-1

Manufacturer:

Quantity:

10 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT1952IGN-1

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LT1952IGN-1#PBF

Manufacturer:

Quantity:

2 950

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT1952IGN-1#PBF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Current page: 1 of 24
Download datasheet (292Kb)

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

(LT1952: 460µA; V

(LT1952-1: 400µA; V

True PWM Soft-Start

Low Stress Short Circuit Protection

Precision 107mV 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

LT1952-1

BLANK DELAY

LT1952/

On/Off = 14.25V/8.75V)

40k

On/Off = 7.75V/6.5V)

SENSE

SOUT

OUT

OSC

40k

178k

10µF

220pF

Si7450

0.005Ω

PA0905

560Ω

OSC

Si7370

×2

SYNC

LTC3900

DESCRIPTIO

The LT

lers optimized to control the forward converter topology,

using one primary MOSFET. The LT1952/LT1952-1 pro-

vide synchronous rectifier control, resulting in extremely

high efficiency. A programmable Volt-Second clamp pro-

vides 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, transformer and rectifier utilization. The devices

include soft-start for controlled exit from shutdown and

undervoltage lockout. A precision 107mV current limit

threshold, independent of duty cycle, combines with soft-

start to provide hiccup short circuit protection. The LT1952

is optimized for micropower bootstrap startup from high

input voltages. The LT1952-1 allows startup from lower

input voltages. Programmable slope compensation and

leading edge blanking allow optimization of loop band-

width with a wide range of inductors and MOSFETs. Each

device 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/LT1952-1 are available in a small 16-pin SSOP

package.

All other trademarks are the property of their respective owners.

Single Switch Synchronous

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

PA1494.242

PH4840

×2

1952 TA01

1952/LT1952-1 are current mode PWM control-

47µF

16V

X5R

×2

12V

20A

OUT

Forward Controller

LT1952/LT1952-1

12V Bus Converter

OUT

vs V

(V)

1952 TA01b

19521fb

Related parts for LT1952IGN

Related keywords

LT1952IGN datasheet
LT1952IGN data sheet
LT1952IGN pdf datasheet
LT1952IGN component
LT1952IGN part
LT1952IGN distributor
LT1952IGN RoHS
LT1952IGN datasheet download