LM9061 datasheet(12/14 Pages) NSC

12 / 14 page

Application Hints (Continued)

TLH12317 – 16

FIGURE 8 Increasing MOSFET Turn On Time

INCREASING MOSFET TURN ON TIME

The ability of the LM9061 to quickly turn on the MOSFET is

an important factor in the management of the MOSFET

power dissipation Caution should be exercised when at-

tempting to increase the MOSFET Turn On time by limiting

the Gate drive current The MOSFET average dissipation

and the LM9061 Delay time must be recalculated with the

extended switching transition time

Figure 8 shows a method of increasing the MOSFET Turn

On time without affecting the Turn Off time In this method

the Gate is charged at an exponential rate set by the added

external Gate resistor and the MOSFET Gate capacitances

Although the LM9061 will drive MOSFETs from any manu-

facturer National Semiconductor offers a wide range of

power MOSFETs

Figure 9 shows a small sample of the

devices available

Part

VDSS

RDS(ON)

Package

NDP706A

75A

60V

0015X

TO-220

NDP706B

70A

60V

0018X

TO-220

NDP708A

60A

80V

0022X

TO-220

NDB708A

60A

80V

0022X

TO-263

NDP606A

48A

60V

0025X

TO-220

NDP606B

42A

60V

0028X

TO-220

NDP608A

36A

80V

0042X

TO-220

NDB608A

36A

80V

0042X

TO-263

NDP508A

19A

80V

0080X

TO-220

NDB508A

19A

80V

0080X

TO-263

NDP408A

11A

80V

0160X

TO-220

NDS9410

30V

003X

SO-8

NDS9936

30V

005X

SO-8

NDS9945

35A

60V

010X

SO-8

Dual

FIGURE 9 Recommended DMOS Power MOSFETs

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