TIP120, TIP121, TIP122 (NPN); TIP125, TIP126, TIP127 (PNP)
5.0
R
B
& R
C
VARIED TO OBTAIN DESIRED CURRENT LEVELS
D
1
MUST BE FAST RECOVERY TYPE, eg:
1N5825 USED ABOVE I
B
≈
100 mA
MSD6100 USED BELOW I
B
≈
100 mA
V
2
approx
+ 8.0 V
0
V
1
approx
-12 V
t
r
, t
f
≤
10 ns
DUTY CYCLE = 1.0%
51
R
B
D
1
+ 4.0 V
25
ms
for t
d
and t
r
, D
1
is disconnected
and V
2
= 0
For NPN test circuit reverse all polarities.
V
CC
- 30 V
R
C
3.0
2.0
SCOPE
t
s
PNP
NPN
TUT
t, TIME (
μ
s)
1.0
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.1
t
f
≈
8.0 k
≈
120
V
CC
= 30 V
I
C
/I
B
= 250
I
B1
= I
B2
T
J
= 25°C
0.2
t
r
t
d
@ V
BE(off)
= 0
0.3
0.5 0.7 1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (AMP)
5.0 7.0 10
Figure 2. Switching Times Test Circuit
Figure 3. Switching Times
r(t), TRANSIENT THERMAL RESISTANCE
(NORMALIZED)
1.0
0.7
0.5
0.3
0.2
0.1
D = 0.5
0.2
0.1
0.05
0.02
0.01
SINGLE PULSE
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
t, TIME (ms)
10
20
50
100
200
500 1.0 k
P
(pk)
Z
qJC(t)
= r(t) R
qJC
R
qJC
= 1.92°C/W MAX
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
t
1
READ TIME AT t
1
t
2
T
J(pk)
- T
C
= P
(pk)
Z
qJC(t)
DUTY CYCLE, D = t
1
/t
2
0.07
0.05
0.03
0.02
0.01
0.01
Figure 4. Thermal Response
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