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PM6675 Datasheet(PDF) 20 Page - STMicroelectronics

Part # PM6675
Description  Very fast load transient response using constant on-time control loop
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675 Datasheet(HTML) 20 Page - STMicroelectronics

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Device description
PM6675
20/47
Figure 8.
"Virtual-ESR" network
The ripple on the COMP pin is the sum of the output voltage ripple and the triangular ripple
generated by the Virtual-ESR Network. In fact the Virtual-ESR Network behaves like a
another equivalent series resistor RVESR.
A good trade-off is to design the network in order to achieve an RVESR given by:
Equation 10
where
∆I
L is the inductor current ripple and VRIPPLE is the total ripple at the T node, chosen
greater than approximately 20mV.
The new closed-loop gain depends on CINT. In order to ensure stability it must be verified
that:
Equation 11
where:
Equation 12
and:
COMP
COMP
VSNS
VSNS
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
VREF
C
COUT
OUT
COMP PIN
VOLTAGE
OUTPUT
VOLTAGE
C
C
R
R
R
R11
t
t
T
T NODE
VOLTAGE
∆V
∆V2
ESR
ESR
∆V1
+
-
V
VREF
REF
g
gm
m
R
RFb1
Fb1
R
RFb2
Fb2
Vr
Vr
+
PWM
PWM
Comparator
Comparator
I=gm(V1-Vr)
V
V11
ESR
I
V
R
L
RIPPLE
VESR
−
∆
=
Vout
Vr
f
2
g
C
Z
m
INT
⋅
⋅
π
>
TOT
out
Z
R
C
2
1
f
⋅
⋅
π
=



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