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IP1202 bảng dữ liệu(PDF) 21 Page - International Rectifier

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Giải thích chi tiết về linh kiện  Dual Output Full Function 2 Phase Synchronous Buck Power Block Integrated Power Semiconductors, PWM Control & Passives
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IP1202 bảng dữ liệu(HTML) 21 Page - International Rectifier

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21
iP1202
Resistor R
6 of the compensation network is calcu-
lated according to equation (26)
(26)
It is recommended to set the channel 2 crossover
frequency 30% higher than the voltage loop cross-
over frequency.
The power stage of the current loop has a dominant
pole at frequency expressed by equation (27):
2
2
L
R
f
eq
p
⋅
⋅
=
π
where, R
eq represents the total resistance of the
power stage that includes the Rdson of the FET
switches, the DC resistance of the inductor and the
shunt resistance, and is expressed by equation (28):
use 10mohm for FET Rdson.
To calculate for C11, place the zero frequency fz at
10 times the dominant pole frequency f
p using equa-
tion (29):
p
z
f
f
×
= 10
(28)
(27)
(29)
in
sh
m
ramp
V
f
L
R
g
V
R
02
2
1
6
2
1
×
×
×
×
×
=
π
sh
L
dson
eq
R
R
R
R
+
+
=
Select
nf
C
8
.
6
11 ≤
R
E/A2
R
iP1202
C11
R6
L1
L2
sh1
Rsh2
Vsw1
Vsw2
Vp-Ref
CC2
Load
FB2
VOUT
Fig. 20: Output 2 error amplifier compensation net-
work for parallel configuration.
z
f
R
C
×
×
⋅
=
6
11
2
1
π



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