BUL44 BUL44F

7

Motorola Bipolar Power Transistor Device Data

t, TIME (ms)

1000

100

10

1.0

0.1

0.01

0.01

0.01

0.01

0.5

0.2

0.1

0.05

0.02

1.0

0.5

0.2

0.1

0.05

SINGLE PULSE

t, TIME (ms)

0.01

0.1

1.0

0.01

0.1

1.0

10

100

1000

SINGLE PULSE

TYPICAL THERMAL RESPONSE

R

θJC(t) = r(t) RθJC

D CURVES APPLY FOR

POWER PULSE TRAIN

SHOWN READ TIME AT t1

TJ(pk) – TC = P(pk) R

θJC1(t)

DUTY CYCLE, D = t1/t2

t1

t2

P(pk)

R

θJC(t) = r(t) RθJC

D CURVES APPLY FOR

POWER PULSE TRAIN

SHOWN READ TIME AT t1

TJ(pk) – TC = P(pk) R

θJC1(t)

DUTY CYCLE, D = t1/t2

t1

t2

P(pk)

Figure 20. Typical Thermal Response (Z

θJC(t)) for BUL44

Figure 21. Typical Thermal Response (Z

θJC(t)) for BUL44F