參數(shù)資料
型號(hào): MPSA20ZL1
廠商: ON SEMICONDUCTOR
元件分類: 小信號(hào)晶體管
英文描述: 100 mA, 40 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-92
封裝: CASE 29-11, TO-226AA, 3 PIN
文件頁(yè)數(shù): 6/6頁(yè)
文件大小: 290K
代理商: MPSA20ZL1
MPSA20
http://onsemi.com
874
Figure 19. 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 20
Figure 21.
TJ, JUNCTION TEMPERATURE (°C)
104
-40
I C
,COLLECT
OR
CURRENT
(nA)
Figure 22.
VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS)
400
2.0
I C
,COLLECT
OR
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 20. Using the model and the de-
vice thermal response the normalized effective transient ther-
mal resistance of Figure 19 was calculated for various duty
cycles.
To find ZθJA(t), multiply the value obtained from Figure 19
by the steady state value RθJA.
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
T = r(t) x P(pk) x RθJA = 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 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.
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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