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PM6675 Datasheet(PDF) 21 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) 21 Page - STMicroelectronics

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Equation 13
Moreover, the CINT capacitor must meet the following condition:
Equation 14
where RTOT is the sum of the ESR of the output capacitor and the equivalent ESR given by
the Virtual-ESR Network (RVESR). The k parameter must be greater than unity (k > 3) and
determines the minimum integrator capacitor value CINT:
Equation 15
The capacitor of the Virtual-ESR Network, C, is chosen as follow
Equation 16
and R is calculated to provide the desired triangular ripple voltage:
Equation 17
Finally the R1 resistor is calculated according to expression 18:
Equation 18
RTOT = ESR + RVESR
TOT
out
Z
SW
R
C
2
k
f
k
f
⋅
⋅
π
=
⋅
>
Vout
Vr
f
k
f
2
g
C
Z
SW
m
INT
⋅
⎟
⎠
⎞
⎜
⎝
⎛
−
⋅
π
>
INT
C
5
C
⋅
>
C
R
L
R
VESR ⋅
=
C
f
1
R
C
f
1
R
1
R
Z
Z
⋅
⋅
π
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⋅
⋅
π
⋅
=



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