TK70403MTB データシートの表示（PDF） - Toko America Inc
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TK70403MTB Datasheet PDF : 10 Pages
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TK70403
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)
450
350
MOUNTED AS
SHOWN
250
FREE AIR
150
50
0
0
50
100
150
TA (°C)
SOT-26 POWER DISSIPATION CURVE
Page 8
January 1999 TOKO, Inc.
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