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PM6680ATR Datasheet(PDF) 37 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) 37 Page - STMicroelectronics

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PM6680A
Design guidelines
37/48
Figure 37.
Virtual ESR network
The T node voltage is the sum of the output voltage and the triangular waveform generated
by the virtual ESR network. In fact the virtual ESR network behaves like a further equivalent
ESR.
A good trade-off is to design the network in order to achieve an RESR given by:
Equation 28
where
∆IL is the inductor current ripple and V
RIPPLE is the overall ripple of the T node
voltage. It should be chosen higher than approximately 30 mV.
The new closed loop gain depends on CINT. In order to ensure stability it must be verified
that:
Equation 29
Where:
COMP
COMP
OU
OU
T
T
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP pin
voltage
L
L
D
D
Output
voltage
C
C
R
R
R1
R1
t
t
T
T node
voltage
∆V
∆V1
R
ROUT
OUT
∆V1
+
-
Vr
Vr
gm
gm
Vr
Vr
+
PWM
PWM
Comparator
Comparator
V1
V1
FB
FB
R
R1
1
R
R2
2
COMP
COMP
OU
OU
T
T
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP pin
voltage
L
L
D
D
Output
voltage
C
C
R
R
R1
R1
t
t
T
T node
voltage
∆V
∆V1
R
ROUT
OUT
∆V1
+
-
Vr
Vr
gm
gm
Vr
Vr
+
PWM
PWM
Comparator
Comparator
V1
V1
FB
FB
R
R1
1
R
R2
2
R
R1
1
R
R2
2
out
L
RIPPLE
ESR
R
I
V
R
−
∆
=
OUT
Z
m
INT
V
Vr
f
2
g
C
×
×
π
>



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