Datasheet

SW
1
C6 =
R4 f´ ´ p
C O
R C
C6 =
R4
´
POLE
1
C5 =
2 R4 f´ ´ ´p
CO O OUT
COMP
REF
2 C V
R
gmps V gmea
´ p ´ ¦ ´
= ´
´
f
f f
æ ö
´
ç ÷
è ø
0.5
sw
co2(Hz) = pole
2
( )
f f f´
0. 5
co1(Hz) = zero pole
C O
1
zero(Hz) =
R C 2
f
p´ ´ ´
1
pole(Hz) =
Vout
Co 2
Io
f
´ ´ ´ p
TPS54061
www.ti.com SLVSBB7C –MAY 2012–REVISED JANUARY 2014
R
COMP
is calculated to be 25.9 kΩ, use the nearest standard value of 26.1 kΩ. Use Equation 24 to set the
compensation zero equal to the modulator pole frequency. Equation 24 yields a 3790 pF for capacitor C
COMP
and
a 4700 pF is chosen. Use the larger value of Equation 25 and Equation 26 to calculate the C
POLE
value, to set
the compensation pole. Equation 26 yields 30.5 pF so the nearest standard of 33 pF is selected.
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
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