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

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.

the UC1706.

high, undefined operation of the outputs may occur with

Thermal Considerations

Should the chip temperature reach approximately 155°C,

a parallel, non--inverting input is activated driving both

outputs to the low state.