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Single Switch Synchronous Forward Controller
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LT1952/LT1952-1
Single Switch Synchronous
Forward Controller
DESCRIPTION FEATURES n n n n n n n n n n n n n n n Synchronous Rectifier Control for High Efficiency
Programmable Volt-Second Clamp
Output Power Levels from 25W to 500W
Low Current Start-Up
(LT1952: 460µA; VIN On/Off = 14.25V/8.75V)
(LT1952-1: 400µA; VIN On/Off = 7.75V/6.5V)
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 • fOSC
Internal 1.23V Reference
2.5V External Reference
Current Mode Control
Small 16-Pin SSOP Package The LT®1952/LT1952-1 are current mode PWM controllers …