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PM6680ATR Folha de dados(PDF) 38 Page - STMicroelectronics

Nome de Peças PM6680ATR
Descrição Electrónicos  Dual synchronous step-down controller with adjustable output voltages plus LDO
PDF  48 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680ATR Folha de dados(HTML) 38 Page - STMicroelectronics

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Design guidelines
PM6680A
38/48
Equation 30
where RTOT is the sum of the ESR of the output capacitor Rout and the equivalent ESR given
by the virtual ESR network RESR.
Moreover CINT must meet the following condition:
Equation 31
Where k is a free design parameter greater than 3 and determines the minimum integrator
capacitor value CINT:
Equation 32
C must be selected as shown:
Equation 33
R must be chosen in order to have enough ripple voltage on integrator input:
Equation 34
R1 can be selected as follows:
Equation 35
Example:
OUT1=1.5 V, fSW = 290 kHz, L = 2.5 µH, Cout = 330 µF with Rout < 12 mΩ.
We design RESR = 12 mΩ. We choose CINT = 1 nF by equations 30, 33 and Cfilt = 47 pF,
RINT = 1 kΩ by eq.27, 28. C = 5.6 nF by Eq.34. Then R = 36 kΩ (eq.34) and R1 = 3 kΩ
(eq.35).
TOT
out
Z
R
C
2
1
f
×
×
π
=
TOT
out
Z
sw
R
C
2
k
f
k
f
×
×
π
=
×
>
OUT
Z
sw
m
INT
V
Vr
f
k
f
2
g
C
×
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
×
π
>
INT
C
5
C
×
>
C
R
L
R
ESR ×
=
Z
Z
f
C
1
R
f
C
1
R
1
R
×
π
×
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
π
×
×
=



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