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BCW29LT1 Datasheet(PDF) 6 Page - Leshan Radio Company

No. de pieza BCW29LT1
Descripción Electrónicos  General Purpose Transistors(PNP Silicon)
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Fabricante Electrónico  LRC [Leshan Radio Company]
Página de inicio  http://www.lrc.cn/
Logo LRC - Leshan Radio Company

BCW29LT1 Datasheet(HTML) 6 Page - Leshan Radio Company

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LESHAN RADIO COMPANY, LTD.
M7–6/6
BCW29LT1 BCW30LT1
t, TIME (ms)
Figure 17. Thermal Response
D = 0.5
0.02
0.05
0.1
0.2
0.01
SINGLE PULSE
DUTY CYCLE, D = t
1 / t 2
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t
1 (SEE AN–569)
Z
θJA(t) = r(t) • RθJA
T
J(pk) – T A = P (pk) Z
θJA(t)
FIGURE 19
P
(pk)
t
2
t
1
1.0
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.03
0.02
0.01
0.01
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
10
20
50
100
200
500
1.0k
2.0k
5.0k
10k
20k
50k
100k
T
J , JUNCTION TEMPERATURE (°C)
Figure 18. Typical Collector Leakage Current
V
CC = 30 V
104
103
102
101
100
10–1
10–2
–4
–2
0
+20
+40
+60
+80
+100
+120
+140
+160
I
CBO
AND
I
CEX @ V BE(off) = 3.0 V
I
CEO
DESIGN NOTE: USE OF THERMAL RESPONSE DATA
A train of periodical power pulses can be represented by the
model as shown in Figure 19. Using the model and the device
thermal response the normalized effective transient thermal re-
sistance of Figure 17 was calculated for various duty cycles.
To find Z θ
JA(t) , multiply the value obtained from Figure 17 by
the steady state value R θ
JA .
Example:
The BCW29LT1 is dissipating 2.0 watts peak under the follow-
ing conditions:
t
1 = 1.0 ms, t 2 = 5.0 ms. (D = 0.2)
Using Figure 17at a pulse width of 1.0 ms and D = 0.2, the read-
ing of r(t) is 0.22.
The peak rise in junction temperature is therefore
∆T = r(t) x P
(pk) x R
θJA = 0.22 x 2.0 x 200 = 88°C.
For more information, see AN–569.


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