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UC3706NG4 Datasheet(PDF) 4 Page - Texas Instruments |
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UC3706NG4 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 8 page 4 UC1706 UC2706 UC3706 D1, D2: UC3611 Schottky Diodes Transformer Coupled MOSFET Drive Circuit CIRCUIT DESCRIPTION (cont.) Charge Pump Circuits D1, D2; UC3611 Schottky Diodes APPLICATIONS Power MOSFET Drive Circuit D1, D2; UC3611 Schottky Diodes Power MOSFET Drive Circuit Using Negative Bias Voltage and Level Shifting to Ground Referenced PWMs Analog Shutdown This circuit is included to get a latched shutdown as close to the outputs as possible, from a time standpoint. With an internal 130mV threshold, this comparator has a common-mode range from ground to (VIN – 3V). When not used, both inputs should be grounded. The time re- quired for this circuit to latch is inversely proportional to the amount of overdrive but reaches a minimum of 180nsec. As with the flip-flop, an input off-time of at least 200nsec is required to reset the latch between pulses. Supply Voltage With an internal 5V regulator, this circuit is optimized for use with a 7 to 40V supply; however, with some slight re- sponse time degradation, it can also be driven from 5V. When VIN is low, the entire circuit is disabled and no cur- rent is drawn from VC. When combined with a UC1840 PWM, the Driver Bias switch can be used to supply VIN to the UC1706. VIN switching should be fast as if VC is high, undefined operation of the outputs may occur with VIN less than 5V. Thermal Considerations Should the chip temperature reach approximately 155°C, a parallel, non--inverting input is activated driving both outputs to the low state. |
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