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LT1952EGN-1 Datasheet(PDF) 1 Page - Linear Technology |
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LT1952EGN-1 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT1952/LT1952-1 1 19521fd TYPICAL APPLICATION DESCRIPTION Single Switch Synchronous Forward Controller The LT ®1952/LT1952-1 are current mode PWM controllers optimized to control the forward converter topology, using one primary MOSFET. The LT1952/LT1952-1 provide 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, 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 start-up from high input voltages. The LT1952-1 allows start-up from lower input voltages. Programmable slope compensation and leading edge blanking allow optimization of loop bandwidth 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. 36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter FEATURES APPLICATIONS n Synchronous Rectifier Control for High Efficiency n Programmable Volt-Second Clamp n Output Power Levels from 25W to 500W n Low Current Start-Up (LT1952: 460μA; VIN On/Off = 14.25V/8.75V) (LT1952-1: 400μA; VIN On/Off = 7.75V/6.5V) n True PWM Soft-Start n Low Stress Short-Circuit Protection n Precision 107mV Current Limit Threshold n Adjustable Delay for Synchronous Timing n Accurate Shutdown Threshold with Programmable Hysteresis n Programmable Slope Compensation n Programmable Leading Edge Blanking n Programmable Frequency (100kHz to 500kHz) n Synchronizable to an External Clock up to 1.5 • fOSC n Internal 1.23V Reference n 2.5V External Reference n Current Mode Control n Small 16-Pin SSOP Package n Telecommunications Power Supplies n Industrial and Distributed Power n Isolated and Non Isolated DC/DC Converters VIN VIN T1 PA0905 SUPPLY FROM BIAS WINDING OF T1 Si7370 2 PH4840 2 L1 PA1494.242 47μF 16V X5R 2 VOUT 12V 20A 220pF 560Ω T2 1952 TA01 VREF COMP SS_MAXDC SD_VSEC FB SYNC GND VIN OUT OC ISENSE SOUT LT1952/ LT1952-1 BLANK DELAY ROSC 0.1μF 40k 16V 340k 13k 52.3k 40k 40k PGND 178k 100k Si7450 0.005Ω SYNC FG CG LTC3900 10μF 0.1μF 12V Bus Converter VOUT vs VIN VIN (V) 36 8 10 16 48 60 66 1952 TA01b 14 12 42 54 72 L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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