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SN75372 Datasheet(PDF) 9 Page - Texas Instruments

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Part # SN75372
Description  DUAL MOSFET DRIVER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN75372 Datasheet(HTML) 9 Page - Texas Instruments

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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
M
t – Time –
µs
(b)
(a)
IRF151
48 V
4
3
2
1
0
0
0.5
1
1.5
2
2.5
3
7
48
3
5
1
2
6
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
I
pk +
VC
tr
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
I
PK +
(3
* 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.


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