TK11630U View Datasheet(PDF) - Toko America Inc
Part Name
Description
MFG CO.
TK11630U Datasheet PDF : 14 Pages
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TK116xxU
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
thermal equilibrium is reached. 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
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
1000
800
600
400
200
0
0
MOUNTED AS
SHOWN
FREE AIR
50
100
150
TA (°C)
SOT-89 POWER DISSIPATION CURVE
January 1999 TOKO, Inc.
Page 11
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