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PM8908 Folha de dados(PDF) 22 Page - STMicroelectronics

Nome de Peças PM8908
Descrição Electrónicos  Monolithic buck converter for DDR memory termination
PDF  28 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8908 Folha de dados(HTML) 22 Page - STMicroelectronics

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Application information
PM8908
22/28
DocID027688 Rev 3
6.7
Compensation network
The PM8908 device implements a constant on-time control loop. The compensation
network is shown in Figure 10.
Figure 10. Compensation network
The following procedure shall be followed in order to calculate the best network external
components value.
Select RF value in order to obtain the desired closed loop regulator bandwidth
according to Equation 10:
Equation 10
where:
–
fT is the crossover frequency, it should be less than about 1/10 of the switching
frequency
–
RCS = 53 m
Select CF according to Equation 11:
Equation 11
Select CP according to Equation 12:
Equation 12
Check the phase margin obtained and repeat the whole procedure if necessary.
COMP
REFIN
CF
8
9
RF
REF
7
CREF
CP
OUT
T
OUT
T
M
CS
OUT
T
F
C
ESR
f
C
ESR
f
g
R
C
f
R
5
2
1
5
2
1
2
F
T
F
R
f
C
5
2
1
OUT
T
C
OUT
P
C
ESR
f
R
C
ESR
C
5
2
1



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