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MJ13333

SWITCHMODE Series NPN Silicon Power Transistor

ON Semiconductor 

MJ13333

IC pk

Vclamp

90% Vclamp 90% IC

IC

tsv

trv

tfi

tti

VCE

IB

90% IB1

tc

10% Vclamp

10%

IC pk 2% IC

TIME

Figure 7. Inductive Switching Measurements

10

IC = 10 A

IB1 = 2 A

Vclamp = 250 V

7.0

TJ = 25°C

5.0

2.0

0

2.0

5.0

10

VBE(off), REVERSE BASE VOLTAGE (VOLTS)

Figure 8. Reverse Base Current versus

VBE(off) With No External Base Resistance

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.

tsv = Voltage Storage Time, 90% IB1 to 10% Vclamp

trv = Voltage Rise Time, 10 – 90% Vclamp

tfi = Current Fall Time, 90 – 10% IC

tti = Current Tail, 10 – 2% IC

tc = Crossover Time, 10% Vclamp to 10% IC

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:

PSWT = 1/2 VCCIC(tc)f

In general, trv + tfi ] tc. However, at lower test currents

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

switching speeds (tc and tsv) which are guaranteed at 100°C.

RESISTIVE SWITCHING PERFORMANCE

2.0

1.0

0.5

0.2

0.1

0.05

0.02

0.2

VCC = 250 V

IC/IB = 5

5.0

2.0

tr

1.0

0.5

td

0.5 1.0

2.0

5.0

10

IC, COLLECTOR CURRENT (AMP)

Figure 9. Turn–On Switching Times

0.2

0.1

0.05

20

ts

tf

VCE = 250 V

IC/IB = 5

VBE(off) = 5 V

0.2

0.5 1.0 2.0

5.0 10

20

IC, COLLECTOR CURRENT (AMP)

Figure 10. Turn–Off Switching Times

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