MPSA20 데이터 시트보기 (PDF) - ON Semiconductor
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MPSA20 Datasheet PDF : 7 Pages
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MPSA20
1.0
0.7
0.5
D = 0.5
0.3
0.2
0.2
0.1
0.1
0.07
0.05
0.05
0.02
0.03
0.02
0.01
SINGLE PULSE
0.01
0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0
P(pk)
FIGURE 20
t1
t2
DUTY CYCLE, D = t1/t2
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t1 (SEE AN−569)
ZqJA(t) = r(t) • RqJA
TJ(pk) − TA = P(pk) ZqJA(t)
5.0 10 20 50 100 200
t, TIME (ms)
500 1.0 k 2.0 k 5.0 k 10 k 20 k 50 k 100 k
Figure 19. Thermal Response
104
VCC = 30 Vdc
103
102
ICEO
101
100
ICBO
AND
10−1
ICEX @ VBE(off) = 3.0 Vdc
10−2
−4 −2
00
0 + 20 + 40 + 60 + 80 + 100 + 120 + 140 + 160
TJ, JUNCTION TEMPERATURE (°C)
Figure 21.
DESIGN NOTE: USE OF THERMAL RESPONSE DATA
A train of periodical power pulses can be represented by
the model as shown in Figure 20. Using the model and the
device thermal response the normalized effective transient
thermal resistance of Figure 19 was calculated for various
duty cycles.
To find ZqJA(t), multiply the value obtained from Figure
19 by the steady state value RqJA.
Example:
Dissipating 2.0 watts peak under the following conditions:
t1 = 1.0 ms, t2 = 5.0 ms. (D = 0.2)
Using Figure 19 at a pulse width of 1.0 ms and D = 0.2, the
reading of r(t) is 0.22.
The peak rise in junction temperature is therefore
DT = r(t) x P(pk) x RqJA = 0.22 x 2.0 x 200 = 88°C.
For more information, see ON Semiconductor
Application Note AN569/D, available on our website at
www.onsemi.com.
400
200
100
60
40
20
10
6.0
4.0
2.0
1.0 ms 100 ms
TC = 25°C
TA = 25°C
dc
10 ms
1.0 s
dc
TJ = 150°C
CURRENT LIMIT
THERMAL LIMIT
SECOND BREAKDOWN LIMIT
4.0 6.0 8.0 10
20
VCE, COLLECTOR−EMITTER VOLTAGE (VOLTS)
Figure 22.
The safe operating area curves indicate IC−VCE
limits of the transistor that must be observed for reliable
operation. Collector load lines for specific circuits must
fall below the limits indicated by the applicable curve.
The data of Figure 22 is based upon TJ(pk) = 150°C; TC
or TA is variable depending upon conditions. Pulse curves
are valid for duty cycles to 10% provided TJ(pk) ≤ 150°C.
TJ(pk) may be calculated from the data in Figure 19. At
high case or ambient temperatures, thermal limitations
will reduce the power that can be handled to values less
than the limitations imposed by second breakdown.
40
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