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PM6680ATR Datasheet(PDF) 35 Page - STMicroelectronics

Part # PM6680ATR
Description  Dual synchronous step-down controller with adjustable output voltages plus LDO
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680ATR Datasheet(HTML) 35 Page - STMicroelectronics

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PM6680A
Design guidelines
35/48
9.6
Closing the integrator loop
The design of external feedback network depends on the output voltage ripple. If the ripple
is higher than approximately 30 mV, the feedback network (Figure 36) is usually enough to
keep the loop stable.
Figure 36.
Circuitry for output ripple compensation
The stability of the system depends firstly on the output capacitor zero frequency.
The following condition should be satisfied:
Equation 23
where k is a design parameter greater than 3 and Rout is the ESR of the output capacitor. It
determinates the minimum integrator capacitor value CINT:
Equation 24
where gm = 50
µs is the integrator transconductance.
+
-
V
Vrr
C
CO
OM
MP
P
g
gm
m
O
OU
UT
T
V
Vrr
+
P
PW
WM
M
C
Co
om
mp
pa
arra
atto
orr
C
CIIN
NT
T
R
RIIN
NT
T
C
CFFIILLTT
t
Vr
C
CO
OU
UT
T
COMP PIN
VOLTAGE
L
L
D
D
OUTPUT
VOLTAGE
I=gm(V1-Vr)
V
V1
1
t
?V
?V
V
VC
CIIN
NT
T
R
RO
OU
UT
T
F
FB
B
R
R11
R
R22
∆
∆
out
out
Zout
sw
R
C
2
k
f
k
f
×
×
π
=
×
>
OUT
Zout
sw
m
INT
V
Vr
f
k
f
2
g
C
×
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
×
π
>



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