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PM6685 Datasheet(PDF) 40 Page - STMicroelectronics

No. de pieza PM6685
Descripción Electrónicos  Dual step-down main supply controller with auxilary voltages for notebook system power
PDF  52 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6685 Datasheet(HTML) 40 Page - STMicroelectronics

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Monitoring and protections
PM6685
40/52
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 30mV), 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 37.
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 RESR.
A good trade-off is to design the network in order to achieve an RESR given by:
Equation 26
where
∆IL is the inductor current ripple and VRIPPLE is the overall ripple of the T node
voltage. It should be chosen higher than approximately 30mV.
The stability of the system depends firstly on the output capacitor value and on RTOT:
+
-
V
Vrr
C
CO
OM
MP
P
g
gm
m
O
OU
UT
T
R
RF
Fb
b1
1
R
RF
Fb
b2
2
V
Vrr
+
P
PW
WM
M
C
Co
om
mp
pa
arra
atto
orr
C
CIINNTT
R
RIINNTT
C
CFFIILLTT
t
Vr
C
COOUUTT
COMP PIN
VOLTAGE
L
L
D
D
OUTPUT
VOLTAGE
I=gm(V1-Vr)
V
V1
1
C
C
R
R1
1
R
R
t
t
T
T NODE
VOLTAGE
∆V
∆V1
R
ROOUUTT
∆V1
out
L
RIPPLE
ESR
R
I
V
R
−
∆
=



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