Communication Concepts 2N6488 - Manual (Page 3)

2N6487, 2N6488, (NPN) 2N6490, 2N6491 (PNP)
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3
Figure 2. Switching Time Test Circuit
1000
Figure 3. Turn−On Time
I
C
, COLLECTOR CURRENT (AMP)
t, TIME
(ns)
500
50
20
0.2 20
T
C
= 25 °C
V
CC
= 30 V
I
C
/I
B
= 10
10
1.0 5.0
t
r
0.5 2.0 10
200
100
t
d
@ V
BE(off)
[ 5.0 V NPN
PNP
+ 10 V
0
SCOPE
R
B
- 4 V
t
r
, t
f
v 10 ns
DUTY CYCLE = 1.0%
R
C
D
1
MUST BE FAST RECOVERY TYPE, e.g.:
1N5825 USED ABOVE I
B
[ 100 mA
MSD6100 USED BELOW I
B
[ 100 mA
25 ms
- 10 V
D
1
51
R
B
AND R
C
VARIED TO OBTAIN DESIRED CURRENT LEVELS.
FOR PNP, REVERSE ALL POLARITIES.
V
CC
+ 30 V
Figure 4. Thermal Response
t, TIME (ms)
1.0
0.01
0.01
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.03
0.02
0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 20 50 100 200 1.0 k 500
Z qJC (t) = r(t) R qJC
R qJC = 1.67 °C/W MAX
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t
1
T
J(pk)
- T
C
= P
(pk)
Z qJC(t)
P
(pk)
t
1
t
2
DUTY CYCLE, D = t
1
/t
2
D = 0.5
0.2
0.05
0.02
0.01
SINGLE PULSE
0.1
r(t), TRANSIENT
THERMAL
RESIST
ANCE
(NORMALIZED)