TPS54383, TPS54386
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SLUS774B–AUGUST 2007–REVISED OCTOBER 2007
The value of the resistor is calculated using a ratio of impedances to match the ratio of ESR zero frequency to
the desired zero frequency.
R2
R3 =
æ
ç
ç
è
ö
æ
ç
ç
è
ö
÷
÷
ø
fZERO(desired)
÷
-1
÷
fESR(zero)
ø
(4)
where:
•
•
fESR(zero) is the ESR zero frequency of the output capacitor.
fZERO(desired) is the desired frequency of the zero added to the feedback. This frequency should be placed
between 20 kHz and 60 kHz to ensure good loop stability.
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): TPS54383 TPS54386