TK11900M Просмотр технического описания (PDF) - Toko America Inc
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TK11900M Datasheet PDF : 10 Pages
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TK11900
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
The range of usable currents can also be found from the
graph below.
(mW)
3
PD
DPD
6
4
5
25
50
75
150
TA (°C)
Procedure:
1)
Find PD
2)
PD1 is taken to be PD x (~ 0.8 - 0.9)
3)
Plot PD1 against 25 °C
4)
Connect PD1 to the point corresponding to the 150
°C with a straight line.
5)
In design, take a vertical line from the maximum
operating temperature (e.g., 75 °C) to the derating
curve.
6)
Read off the value of PD against the point at which
the vertical line intersects the derating curve. This
is taken as the maximum power dissipation, DPD.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
500
400
300
200
100
0
0
MOUNTED
FREE AIR
50
100
150
TA (°C)
SOT-23L POWER DISSIPATION
November 2000 TOKO, Inc.
Page 7
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