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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LT1952IGN Datenblatt(PDF) 1 Page - Linear Technology |
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LT1952IGN Datenblatt(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT1952 1 1952f APPLICATIO S TYPICAL APPLICATIO DESCRIPTIO FEATURES The LT ®1952 is a current mode PWM controller optimized 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. ■ Telecommunications Power Supplies ■ Industrial and Distributed Power ■ Isolated and Non-Isolated DC/DC Converters , LTC and LT are registered trademarks of Linear Technology Corporation. ■ 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 • fOSC ■ Internal 1.23V Reference ■ 2.5V External Reference ■ Current Mode Control ■ Small 16-Pin SSOP Package Single Switch Synchronous Forward Controller 36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter 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 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 |
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