MJE5850_06 datasheet(6/8 Pages) ONSEMI

Nome de Peças	MJE5850

Descrição Electrónicos	8 AMPERE PCP SILICON POWER TRANSISTORS 300 - 350 - 400 VOLTS 80 WATTS

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Fabricante Electrônico	ONSEMI [ON Semiconductor]

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MJE5850, MJE5851, MJE5852

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6

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% VCEM

trv = Voltage Rise Time, 10−90% VCEM

tfi = Current Fall Time, 90−10% ICM

tti = Current Tail, 10−2% ICM

tc = Crossover Time,10% VCEM to 10% ICM

An enlarged portion of the inductive switching waveform

is shown in Figure 7 to aid on 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−222A:

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.

t, TIME (ms)

1

0.01

0.7

0.2

0.1

0.05

0.02

0.05

1

2

5

10

20

50

100

200

500

ZqJC(t) = r(t) RqJC

RqJC = 1.25°C/W MAX

D CURVES APPLY FOR POWER

PULSE TRAIN SHOWN

READ TIME AT t1

TJ(pk) − TC = P(pk) ZqJC(t)

P(pk)

t1

t2

DUTY CYCLE, D = t1/t2

D = 0.5

0.2

0.01

SINGLE PULSE

0.1

0.5

0.2

1 k

0.5

0.3

0.07

0.03

0.02

IC, COLLECTOR CURRENT (AMPS)

tr

Figure 9. Turn−On Switching Times

Figure 10. Turn−Off Switching Time

0.1

0.3

0.2

10

0.4

Figure 11. Typical Thermal Response [ZqJC(t)]

0.02

0.01

1.0

0.7

0.3

0.2

0.5

0.1

IC, COLLECTOR CURRENT (AMPS)

0.7

3.0

10

2.0

5.0

0.1

1.0

7.0

VCC = 250 V

IC/IB = 4

TJ = 25°C

0.5

0.03

0.05

0.07

0.7

VCC = 250 V

IC/IB = 4

VBE(off) = 5 V

TJ = 25°C

0.3

0.2

0.7

4.0

10

0.1

2.0

7.0

0.5

0.3

1.0

td

ts

tf

0.02

0.05

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