BDX53B, BDX53C (NPN), BDX54B, BDX54C (PNP)
R
B
AND R
C
VARIED TO OBTAIN DESIRED CURRENT LEVELS
D
1
MUST BE FAST RECOVERY TYPES, e.g.:
1N5825 USED ABOVE I
B
[
100 mA
MSD6100 USED BELOW I
B
[
100 mA
TUT
R
B
V
2
APPROX
V
CC
- 30 V
R
C
5.0
3.0
2.0
SCOPE
t, TIME (
μ
s)
1.0
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.1
V
CC
= 30 V
I
C
/I
B
= 250
I
B1
= I
B2
T
J
= 25°C
0.2
t
r
t
f
t
s
+ 8.0 V
0
V
1
APPROX
51
D
1
+ 4.0 V
[
8.0 k
[
120
25
ms
-12 V
t
r
, t
f
v
10 ns
DUTY CYCLE = 1.0%
for t
d
and t
r
, D
1
is disconnected
and V
2
= 0
For NPN test circuit reverse all polarities
t
d
@ V
BE(off)
= 0 V
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 Time Test Circuit
Figure 3. Switching Times
r(t) EFFECTIVE TRANSIENT
THERMAL RESISTANCE (NORMALIZED)
1.0
0.7
0.5
0.3
0.2
D = 0.5
0.2
0.1
0.05
0.02
t
1
0.01
SINGLE PULSE
t
2
SINGLE
PULSE
P
(pk)
R
qJC
(t) = r(t) R
qJC
R
qJC
= 1.92°C/W
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t
1
T
J(pk)
- T
C
= P
(pk)
R
qJC
(t)
50
100
200 300
500
1000
0.1
0.07
0.05
0.03
0.02
0.01
0.01
DUTY CYCLE, D = t
1
/t
2
0.02 0.03
0.05
0.1
0.2 0.3
0.5
1.0
2.0 3.0 5.0
10
t, TIME OR PULSE WIDTH (ms)
20
30
Figure 4. Thermal Response
20
IC, COLLECTOR CURRENT (AMP)
10
5.0
2.0
1.0
0.5
0.2
0.1
5.0 ms
1.0 ms
100
ms
500
ms
dc
T
J
= 150°C
BONDING WIRE LIMITED
THERMALLY LIMITED @ T
C
= 25°C
(SINGLE PULSE)
SECOND BREAKDOWN LIMITED
CURVES APPLY BELOW RATED V
CEO
BDX53B, BDX54B
BDX53C, BDX54C
2.0 3.0
5.0 7.0 10
50
20 30
V
CE
, COLLECTOR-EMITTER VOLTAGE (VOLTS)
70 100
0.05
0.02
1.0
There are two limitations on the power handling ability of
a transistor average junction temperature and second
breakdown. Safe operating area curves indicate I
C
-V
CE
limits of the transistor that must be observed for reliable
operation, i.e., the transistor must not be subjected to greater
dissipation than the curves indicate.
The data of Figure 5 is based on T
J(pk)
= 150
°
C; T
C
is
variable depending on conditions. Second breakdown pulse
limits are valid for duty cycles to 10% provided
T
J(pk)
t
150
°
C. T
J(pk)
may be calculated from the data in
Figure 4. At high case temperatures, thermal limitations will
reduce the power that can be handled to values less than the
limitations imposed by second breakdown.
Figure 5. Active-Region Safe Operating Area
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