TK65828STL データシートの表示（PDF） - Toko America Inc
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TK65828STL Datasheet PDF : 6 Pages
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ADVANCED INFORMATION
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
PD is the value when the thermal protection circuit is
activated. A simple way to determine PD is to calculate VIN
x IIN when the output side is shorted. Input current gradually
falls as temperature rises. You should use the value when
thermal equilibrium is reached.
The range of usable currents can also be found from the
graph below.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
500
MOUNTED AS
400
SHOWN
(mW)
3
PD
300
FREE AIR
200
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.
100
0
0
50
100
150
TA (°C)
SOT-23-5 POWER DISSIPATION CURVE
Page 4
February 1999 TOKO, Inc.
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