TK73246MCL Просмотр технического описания (PDF) - Toko America Inc
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TK73246MCL Datasheet PDF : 16 Pages
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TK732xx
DEFINITIONS AND TERMS (CONT.)
APPLICATION INFORMATION
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)
750
600
MOUNTED AS
SHOWN
450
FREE AIR
300
INPUT-OUTPUT CAPACITORS
The output capacitor is necessary for stable operation.
The regulator may oscillate if the output capacitor is too
small or missing. The output capacitor size is determined
by load, transient response and external transistor used.
Evaluation in the circuit is recommended to ensure
performance requirements are satisfied. A minimum of 4.7
µF is necessary for stability, with twice that value
recommended. The minimum recommended input
capacitor is 1 µF. Problems do not occur with larger values
of capacitance. However, extremely low ESR may result in
unstable operation. Thus, the use of large value ceramic
capacitors is not recommended on the output.
BOARD LAYOUT
GND
150
0
0
50
100
150
TA (°C)
CONTROL
VIN
VOUT
GND
RIPK
SOT-23L-8 POWER DISSIPATION CURVE
SOT-23L-8 BOARD LAYOUT
January 1999 TOKO, Inc.
Page 11
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