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IP1202PBF 数据表(PDF) 19 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) 19 Page - International Rectifier

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19
iP1202PbF
3. Place a zero at 75% of f
LC to cancel one of the LC
filter poles.
o
o
z
C
L
f
×
×
=
π
2
1
75
.
0
4. Calculate C
9 using equations (13) and (15)
Calculation of compensation components for output1,
based on the example above yields:
f
LC = 5.0kHz
f
z = 3.8kHz
f
0 = 45kHz
f
esr = 14kHz, per equation (6) using Resr = 12mΩ.
R
5 = 2.49K
C
9 = 18nF
The same steps can be used to determine the val-
ues of the compensation components for output2.
Sometimes, a pole f
p2 is added at half the switching
frequency to filter the switching noise. This is done
by adding a capacitor C
opt in Fig.18 from the output of
the error amplifier (CC pin of iP1202PbF) to ground.
This pole is given by equation (16):
(16)
C
opt is found from equation (17) by rearranging the
terms in equation (16) and by setting f
p2 = fsw / 2:
(17)
Magnitude(dB)
Frequency
FZ1
H(s) dB
FZ2 FP2 FP3
C10
R9
R7
E/A1
Vout1
FB1
VREF
CC1
iP1202
R23
C9
C18
R24
C19
opt
p
C
R
f
×
×
≈
5
2
2
1
π
m
LC
esr
IN
g
R
R
R
f
f
f
V
R
1
1
25
.
1
7
9
7
2
0
5
×
+
×
×
×
×
=V
ramp
5
2
2
1
R
f
C
p
opt
×
×
=
π
)
1
(
)
1
(
)
1
(
)
1
(
1
)
(
19
24
18
23
19
9
9
23
9
9
C
sR
C
sR
C
sR
C
sR
C
sR
s
H
+
×
+
+
×
+
×
=
Fig. 19: Typical Type III compensation and its gain
plot
Type III
Type III compensation scheme allows the use of any
type of capacitors with esr frequency of any range.
This scheme suggests a double pole double zero
compensation and requires more components around
the error amplifier to achieve the desired gain and
phase margins. Fig. 19 represents the type III com-
pensation network for iP1202PbF.
The transfer function of the type III compensator is
given by eqaution (18)
(18)
2. Calculate R
5 using equation (14):
(14)
Where,
V
IN = Maximum Input voltage
f
0 = Error amplifier zero crossover frequency
f
esr= Output capacitor Co zero frequency
f
LC = Output frequency resonant filter
g
m= Error amplifier transconductance. Use 2mS for
g
m.
V
ramp = Oscillator ramp Voltage.
Use 1.25V for V
ramp
(15)
iP1202PbF



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