MPS6521RLRA 查看數據表（PDF） - ON Semiconductor
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MPS6521RLRA Datasheet PDF : 11 Pages
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MPS6521 (NPN) MPS6523 (PNP)
PNP
MPS6523
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
FIGURE 40
DUTY CYCLE, D = t1/t2
P(pk)
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
t1
READ TIME AT t1 (SEE AN569)
ZqJA(t) = r(t) w RqJA
t2
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 39. 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 41.
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
40
VCE, COLLECTOR−EMITTER VOLTAGE (VOLTS)
Figure 42.
DESIGN NOTE: USE OF THERMAL RESPONSE DATA
A train of periodical power pulses can be
represented by the model as shown in Figure 40. Using
the model and the device thermal response the
normalized effective transient thermal resistance of
Figure 39 was calculated for various duty cycles.
To find ZqJA(t), multiply the value obtained from
Figure 39 by the steady state value RqJA.
Example:
The MPS6523 is dissipating 2.0 watts peak under the
following conditions:
t1 = 1.0 ms, t2 = 5.0 ms. (D = 0.2)
Using Figure 39 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 from the
Literature Distribution Center or on our website at
www.onsemi.com.
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 42 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 39. 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.
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