TK11811 Ver la hoja de datos (PDF) - Toko America Inc
Número de pieza
componentes Descripción
Lista de partido
TK11811 Datasheet PDF : 8 Pages
| |||
ADDITIONAL INFORMATION (CONT.)
RC values depend upon the operating current, and should
be chosen experimentally using the given values of 3300
pF and 22 kΩ as a starting point.
INPUT/OUTPUT DECOUPLING CAPACITORS
DC-DC converters generate a large ripple current on both
the input and the output of the circuit. The capacitors used
should be as large as possible and have low impedance in
the 300 kHz range. Since low temperatures cause
capacitors to decrease capacitance and increase
Equivalent Series Resistance (ESR), care should be taken
to choose capacitors that have acceptable characteristics
over the temperature range you intend to use. This should
be done experimentally to verify results, as capacitor
performance varies widely from manufacturer to
manufacturer. Tantalum capacitors are generally the best
choice and 10 µF should be adequate for most applications.
LOAD CHARACTERISTICS
The TK11811 should not be allowed to start-up under full
load conditions. If this occurs, the output may not stabilize
to the correct output voltage. This can be compensated for,
somewhat, by adjusting the RC of the feedback loop or by
decreasing the output decoupling capacitor. Maximum
current can be drawn after the oscillator has started and
the output has reached nominal output voltage. This is
more critical with input voltages under 1.3 V as the converter
needs to generate sufficient output to ensure correct
internal bandgap and bias voltages.
TK11811
January 1999 TOKO, Inc.
Page 7
Share Link: 