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APW7165C Datasheet(PDF) 13 Page - Anpec Electronics Coropration

Part # APW7165C
Description  5V to 12V Synchronous Buck Controller
PDF  20 Pages
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APW7165C Datasheet(HTML) 13 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.2 - Oct., 2012
APW7165C
www.anpec.com.tw
13
Application Information (Cont.)
Figure 3. The LC Filter Gain & Frequency
The PWM modulator is shown in Figure 4. The input is
the output of the error amplifier and the output is the PHASE
node. The transfer function of the PWM modulator is given
by:
Figure 4. The PWM Modulator
The compensation circuit is shown in Figure 5. R3 and
C1 introduce a zero and C2 introduces a pole to reduce
the switching noise. The transfer function of error ampli-
fier is given by:
The pole and zero of the compensation network are:
Compensation (Cont.)
Figure 5. Compensation Network
The closed loop gain of the converter can be written as:
Figure 6 shows the converter gain and the following guide-
lines will help to design the compensation network.
1.Select the desired zero crossover frequency F
O:
(1/5 ~ 1/10) x F
SW >FO>FZ
Use the following equation to calculate R3:
F
ESR
F
LC
Frequency
-40dB/dec
-20dB/dec
Gain
V
OSC
PWM
Comparator
Driver
Driver
Output of
Error
Amplifier
V
IN
PHASE
gm
F
R2
R2
R1
2
F
F
V
V
R3
O
LC
ESR
IN
OSC
×
+
×
×
∆
=
Figure 2. The Output LC Filter
L
C
OUT
ESR
Output
PHASE
OSC
IN
PWM
V
V
=
GAIN
∆
C2
C2
C1
R3
C2
C1
s
s
C1
R3
1
s
gm
×
×
×
+
+
×
×
+
×
=






+
×
=
×
=
sC2
1
//
sC1
1
R3
gm
gm
O
AMP
Z
GAIN
C2
C1
C2
C1
R3
2
1
+
×
×
×
π
×
P
F
C1
R3
2
1
×
×
π
×
=
FZ
C2
V
OUT
R2
R1
R3
Error
Amplifier
V
REF
C1
COMP
FB
-
+
AMP
PWM
LC
GAIN
GAIN
GAIN
×
×
×
+ R2
R1
R2
Where:
gm = 667
µA/V



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