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IP1202PBF 数据表(PDF) 21 Page - International Rectifier

部件名 IP1202PBF
功能描述  Dual Output Full Function 2 Phase Synchronous Buck Power Block Integrated Power Semiconductors, PWM Control & Passives
PDF  29 Pages
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制造商  IRF [International Rectifier]
网页  http://www.irf.com
标志 IRF - International Rectifier

IP1202PBF 数据表(HTML) 21 Page - International Rectifier

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21
iP1202PbF
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
iP1202PbF



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