Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

Preview PDF HTML

PM6680 Fiches technique(PDF) 37 Page - STMicroelectronics

No de pièce PM6680
Description  No Rsense dual step-down controller with adjustable voltages for notebook system power
PDF  49 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680 Fiches technique(HTML) 37 Page - STMicroelectronics

Back Button PM6680 Datasheet HTML 33Page - STMicroelectronics PM6680 Datasheet HTML 34Page - STMicroelectronics PM6680 Datasheet HTML 35Page - STMicroelectronics PM6680 Datasheet HTML 36Page - STMicroelectronics PM6680 Datasheet HTML 37Page - STMicroelectronics PM6680 Datasheet HTML 38Page - STMicroelectronics PM6680 Datasheet HTML 39Page - STMicroelectronics PM6680 Datasheet HTML 40Page - STMicroelectronics PM6680 Datasheet HTML 41Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 37 / 49 page
background image
PM6680
Device description
37/49
7.13.6
Closing the integrator loop
The design of external feedback network depends on the output voltage ripple. If the ripple
is higher than approximately 30mV, the feedback network (Figure 35) is usually enough to
keep the loop stable.
Figure 36.
Circuitry for output ripple compensation
The stability of the system depends firstly on the output capacitor zero frequency. The
following condition should be satisfied:
Equation 23
where k is a design parameter greater than 3 and Rout is the ESR of the output capacitor. It
determinates the minimum integrator capacitor value CINT:
Equation 24
where gm = 50us is the integrator transconductance.
In order to ensure stability it must be also verified that:
Equation 25
+
-
V
Vrr
C
CO
OM
MP
P
g
gm
m
O
OU
UT
T
V
Vrr
+
P
PW
WM
M
C
Co
om
mp
pa
arra
atto
orr
C
CIIN
NT
T
R
RIIN
NT
T
C
CF
FIIL
LT
T
t
Vr
C
CO
OU
UT
T
COMP PIN
VOLTAGE
L
L
D
D
OUTPUT
VOLTAGE
I=gm(V1-Vr)
V
V1
1
t
?V
?V
V
VC
CIIN
NT
T
R
RO
OU
UT
T
F
FB
B
R
R1
1
R
R2
2
out
out
Zout
sw
R
C
2
k
f
k
f
×
×
π
=
×
>
OUT
Zout
sw
m
INT
V
Vr
f
k
f
2
g
C
×
⎟
⎠
⎞
⎜
⎝
⎛
−
×
π
>
OUT
Zout
m
INT
V
Vr
f
2
g
C
×
×
π
>



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49


Fiches technique Télécharger

Go To PDF Page


Lien URL



ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Lien vers la fiche technique    |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com