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UC1715 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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UC1715 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 8 page UC1714/5 UC2714/5 UC3714/5 FEATURES • Single Input (PWM and TTL Compatible) • High Current Power FET Driver, 1.0A Source/2A Sink • Auxiliary Output FET Driver, 0.5A Source/1A Sink • Time Delays Between Power and Auxiliary Outputs Independently Programmable from 50ns to 500ns • Time Delay or True Zero-Voltage Operation Independently Configurable for Each Output • Switching Frequency to 1MHz • Typical 50ns Propagation Delays • ENBL Pin Activates 220µA Sleep Mode • Power Output is Active Low in Sleep Mode • Synchronous Rectifier Driver DESCRIPTION These two families of high speed drivers are designed to provide drive waveforms for complementary switches. Complementary switch configura- tions are commonly used in synchronous rectification circuits and active clamp/reset circuits, which can provide zero voltage switching. In order to facilitate the soft switching transitions, independently programmable de- lays between the two output waveforms are provided on these drivers. The delay pins also have true zero voltage sensing capability which allows immediate activation of the corresponding switch when zero voltage is ap- plied. These devices require a PWM-type input to operate and can be in- terfaced with commonly available PWM controllers. In the UC1714 series, the AUX output is inverted to allow driving a p-channel MOSFET. In the UC1715 series, the two outputs are configured in a true complementary fashion. 6 5 7 8 INPUT T1 T2 ENBL S Q R TIMER V REF S Q R TIMER V REF 50ns –500ns 50ns –500ns 5V ENBL V CC 3V GND BIAS 1.4V ENABLE UC1714 ONLY 4AUX 2 PWR 1VCC LOGIC GATES TIMER REF 3GND BLOCK DIAGRAM Complementary Switch FET Drivers 02/99 UDG-99028 Note: Pin numbers refer to J, N and D packages. |
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