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APW7158 Datasheet(PDF) 17 Page - Anpec Electronics Coropration

Part # APW7158
Description  Dual Synchronous Buck PWM Controllers
Download  24 Pages
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APW7158 Datasheet(HTML) 17 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.2 - Aug., 2009
APW7158
www.anpec.com.tw
17
Application Information (Cont.)
PWM Compensation (Cont.)
VCOMP
C2
VOUT
R3
VREF
C1
V
FB
-
+
C3
R2
R1
Figure 8. Compensation Network
The closed loop gain of the converter can be written as:
AMP
PWM
LC
GAIN
GAIN
GAIN
×
×
Figure 9. Shows the asymptotic plot of the closed loop
converter gain and the following guidelines will help to
design the compensation network. Using the below
guidelines should give a compensation similar to the
curve plotted. A stable closed loop has a -20dB/ decade
slope and a phase margin greater than 45 degree.
1. Choose a value for R1, usually between 1K and 5K.
2. Select the desired zero crossover frequency F
O:
(1/5 ~ 1/10) x F
S >FO>FESR
Use the following equation to calculate R2:
1
R
F
F
V
V
2
R
LC
O
IN
OSC
×
×
=
3. Place the first zero F
Z1 before the output LC filter
double pole frequency F
LC.
F
Z1 = 0.75 x FLC
Calculate the C2 by the equation:
75
.
0
F
2
R
2
1
2
C
LC ×
×
×
π
×
=
4.Set the pole at the ESR zero frequency F
ESR:
F
P1 = FESR
Calculate the C1 by the equation:
1
F
2
C
2
R
2
2
C
1
C
ESR
×
×
×
π
×
=
5. Set the second pole F
P2 at half the switching frequency
and also set the second zero F
Z2 at the output LC filter
double pole F
LC. The compensation gain should not ex-
ceed the error amplifier open loop gain, check the com-
pensation gain at F
P2 with the capabilities of the error
amplifier.
F
P2 = 0.5xFO
F
Z2 = FLC
Combine the two equations will get the following compo-
nent calculations:
1
F
2
F
1
R
3
R
LC
S
×
=
S
F
3
R
1
3
C
×
×
π
=
Gain
0
FLC
FESR
FP2=0.5FS
FZ1=0.75FLC
FO
Frequency
PWM & Filter
Gain
Compensation
Gain
Converter
Gain
FZ2=FLC
FP1=FESR
20log
(VIN/ VOSC)
20log
(R2/R1)
Open Loop Error
Amp Gain
Figure 9. Converter Gain & Frequency
Output Inductor Selection
The inductor value determines the inductor ripple current
and affects the load transient response. Higher inductor
value reduces the inductor’s ripple current and induces
lower output ripple voltage. The ripple current and ripple
voltage can be approximated by:
IN
OUT
S
OUT
IN
RIPPLE
V
V
L
F
V
V
I
×
×
=
ESR
I
VOUT
RIPPLE ×
=


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