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PM6641TR Datasheet(PDF) 24 Page - STMicroelectronics

Part # PM6641TR
Description  Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6641TR Datasheet(HTML) 24 Page - STMicroelectronics

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Device description
PM6641
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7.3
SW regulators control loop
The PM6641 switching regulators are buck converters employing a constant frequency,
peak current mode PWM control loop, as shown in the following figure:
In the current mode constant frequency loop the Power Stage is represented by a controlled
current generator feeding the power stage output capacitor and load. The equivalent
transfer function is:
Equation 1
with Co and Res being the output capacitance and its equivalent series resistance and Ro
representing the output load.
Figure 28. SW Regulator Control Loop
gm
a
KL
IL
RES
CO
RO
RC
CC
VREF
Power Stage
VC
VO
Signal Stage
CRO
gm
a
KL
IL
RES
CO
RO
RC
CC
VREF
Power Stage
VC
VO
Signal Stage
CRO
(
)
()
O
O
ES
O
ES
O
L
O
R
1
R
R
sC
1
R
sC
)
s
(
I
)
s
(
V
)
s
(
H
+
+
+
=
=



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