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PM6681ATR Datasheet(PDF) 36 Page - STMicroelectronics

Part # PM6681ATR
Description  Dual synchronous step-down controller with adjustable LDO
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6681ATR Datasheet(HTML) 36 Page - STMicroelectronics

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Design guidelines
PM6681A
36/47
Equation 27
Due to the capacitive divider (CINT, Cfilt), the ripple voltage at the COMP pin is given by:
Equation 28
Where VRIPPLEout is the output ripple and q is the attenuation factor of the output ripple.
If the ripple is very small (lower than approximately 30 mV), a further compensation network,
named virtual ESR network, is needed. This additional part generates a triangular ripple
that is added to the ESR output voltage ripple at the input of the integrator network. The
complete control schematic is represented in Figure 40.
Figure 40.
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 RESR.
A good trade-off is to design the network in order to achieve an RESR given by:
Equation 29
filt
INT
filt
INT
CUT
INT
C
C
C
C
f
2
1
R
+
×
×
×
π
=
q
V
C
C
C
V
V
RIPPLEout
filt
INT
INT
RIPPLEout
RIPPLEINT
×
=
+
×
=
out
L
RIPPLE
ESR
R
I
V
R
−
∆
=



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