UCC28180
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SLUSBQ5A –NOVEMBER 2013–REVISED NOVEMBER 2013
A standard value 2700-pF capacitor for CICOMP results in a current averaging pole frequency of 4.314 kHz.
mi ´M1
K1 ´ 2´ p ´ 2700pF
g
f
=
= 4.314kHz
IAVG
(102)
The transfer function of the current loop can be plotted:
K12.5RSENSEVOUT
1
GCL(f) =
´
s(f)2K1CICOMP
KFQM1M2LBST
s(f) +
gmi ´M1
(103)
(104)
GCLdB(f) = 20log G (f)
(
CL
)
100
80
±80
Gain
±90
Phase
60
±100
±110
±120
±130
±140
±150
±160
±170
±180
40
20
0
±20
±40
±60
±80
±100
10
100
1k
10k
100k
1M
Frequency (Hz)
C005
Figure 33. Bode Plot of the Current Averaging Circuit
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