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參數(shù)資料
| 型號(hào)： | MPS5172RLRE |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類(lèi)： | 小信號(hào)晶體管 |
| 英文描述： | 100 mA, 25 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92 |
| 封裝： | TO-226, 3 PIN |
| 文件頁(yè)數(shù)： | 5/5頁(yè) |
| 文件大小： | 169K |
| 代理商： | MPS5172RLRE |
MPS5172
http://onsemi.com
819
Figure 8. Thermal Response
t, TIME (ms)
1.0
0.01
r(t)
TRANSIENT
THERMAL
RESIST
ANCE
(NORMALIZED)
0.01
0.02
0.03
0.05
0.07
0.1
0.2
0.3
0.5
0.7
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
D = 0.5
0.2
0.1
0.05
0.02
0.01
SINGLE PULSE
DUTY CYCLE, D = t1/t2
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t1 (SEE AN–569)
ZqJA(t) = r(t) w RqJA
TJ(pk) – TA = P(pk) ZqJA(t)
t1
t2
P(pk)
FIGURE 9
Figure 10.
TJ, JUNCTION TEMPERATURE (°C)
104
-40
I C
,COLLECTOR
CURRENT
(nA)
Figure 11.
VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS)
400
2.0
I C
,COLLECTOR
CURRENT
(mA)
DESIGN NOTE: USE OF THERMAL RESPONSE DATA
A train of periodical power pulses can be represented by
the model as shown in Figure 9. Using the model and the de-
vice thermal response the normalized effective transient
thermal resistance of Figure 8 was calculated for various
duty cycles.
To find ZθJA(t), multiply the value obtained from Figure
8 by the steady state value RθJA.
Example:
The MPS3904 is dissipating 2.0 watts peak under the follow-
ing conditions:
t1 = 1.0 ms, t2 = 5.0 ms. (D = 0.2)
Using Figure 8 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
T = r(t) x P(pk) x RθJA = 0.22 x 2.0 x 200 = 88°C.
For more information, see ON Semiconductor Applica-
tion Note AN569/D, available from the Literature Distribu-
tion 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 11 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 8. 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.
10-2
10-1
100
101
102
103
-20
0
+20 +40 +60 +80 +100 +120 +140 +160
VCC = 30 Vdc
ICEO
ICBO
AND
ICEX @ VBE(off) = 3.0 Vdc
TA = 25°C
CURRENT LIMIT
THERMAL LIMIT
SECOND BREAKDOWN LIMIT
1.0 ms
10 s
TC = 25°C
1.0 s
dc
4.0
6.0
10
20
40
60
100
200
4.0
6.0 8.0 10
20
40
TJ = 150°C
100 s
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