MJE13005

http://onsemi.com

4

TIME

10%

Figure 7. Inductive Switching Measurements

Table 1. Typical Inductive Switching Performance

AMP

_C

ns

ns

ns

ns

ns

2

25

100

600

900

70

110

100

240

80

130

180

320

3

25

100

650

950

60

100

140

330

60

100

200

350

4

25

100

550

850

70

110

160

350

100

160

220

390

NOTE: All Data recorded in the inductive Switching Circuit In Table 2.

SWITCHING TIMES NOTE

In resistive switching circuits, rise, fall, and storage times

have been defined and apply to both current and voltage

waveforms since they are in phase. However, for inductive

loads which are common to SWITCHMODE power

supplies and hammer drivers, current and voltage

waveforms

are

not

in

phase.

Therefore,

separate

measurements must be made on each waveform to

determine the total switching time. For this reason, the

following new terms have been defined.

An enlarged portion of the inductive switching

waveforms is shown in Figure 7 to aid in the visual identity

of these terms.

For the designer, there is minimal switching loss during

storage time and the predominant switching power losses

occur during the crossover interval and can be obtained

using the standard equation from AN−222:

this relationship may not be valid.

As is common with most switching transistors, resistive

switching is specified at 25

°C and has become a benchmark

for designers. However, for designers of high frequency

converter circuits, the user oriented specifications which

make this a “SWITCHMODE” transistor are the inductive

Figure 8. Turn−On Time

0.02

0.01

1

0.5

0.2

0.4

4

12

0.04

0.2

0.05

0.1

0.1

Figure 9. Turn−Off Time

0.2

0.1

10

5

1

0.5

4

12

0.04

0.2

0.3

0.5

0.1

2

RESISTIVE SWITCHING PERFORMANCE