SN75372D datasheet(9/11 Pages) TI

9 / 11 page

SN75372

DUAL MOSFET DRIVER

SLLS025A – JULY 1986

3–9

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

A faster, more efficient drive circuit uses an active pullup as well as an active pulldown output configuration,

referred to as a totem-pole output. The SN75372 driver provides the high speed, totem-pole drive desired in

an application of this type, see Figure 13(a). The resulting faster switching speeds are shown in Figure 13(b).

5 V

TLC555P

1/2 SN75372

t – Time –

µs

(b)

(a)

IRF151

48 V

0.5

1.5

2.5

Figure 14. Power MOSFET Drive Using SN75372

Power MOSFET drivers must be capable of supplying high peak currents to achieve fast switching speeds as

shown by the equation

pk +

where C is the capacitive load, and tr is the desired drive time. V is the voltage that the capacitance is charged

to. In the circuit shown in Figure 13(a), V is found by the equation

V = VOH – VOL

Peak current required to maintain a rise time of 100 ns in the circuit of Figure 13(a) is

PK +

* 0)4(10*9)

100(10*9)

+ 120 mA

Circuit capacitance can be ignored because it is very small compared to the input capacitance of the IRF151.

With a VCC of 5 V, and assuming worst-cast conditions, the gate drive voltage is 3 V.

For applications in which the full voltage of VCC2 must be supplied to the MOSFET gate, the SN75374 quad

MOSFET driver should be used.

SN75372D Datasheet(PDF) 9 Page - Texas Instruments