Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

Preview PDF HTML

PM6680 Scheda tecnica(PDF) 38 Page - STMicroelectronics

Il numero della parte PM6680
Spiegazioni elettronici  No Rsense dual step-down controller with adjustable voltages for notebook system power
PDF  49 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680 Scheda tecnica(HTML) 38 Page - STMicroelectronics

Back Button 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 PM6680 Datasheet HTML 42Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 38 / 49 page
background image
Device description
PM6680
38/49
In order to reduce ground noise due to load transient on the other section, it is
recommended to add a resistor RINT and a capacitor Cfilt that, together with CINT, realize a
low pass filter (see Figure 36). The cutoff frequency fCUT must be much greater (10 or more
times) than the switching frequency of the section:
Equation 26
Due to the capacitive divider (CINT, Cfilt), the ripple voltage at the COMP pin is given by:
Equation 27
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
filt
INT
filt
INT
CUT
INT
C
C
C
C
f
2
1
R
+
×
×
×
π
=
q
V
C
C
C
V
V
RIPPLEout
filt
INT
INT
RIPPLEout
RIPPLEINT
×
=
+
×
=
COMP
COMP
OUT
OUT
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP PIN
VOLTAGE
L
L
D
D
OUTPUT
VOLTAGE
C
C
R
R
R1
R1
t
t
T
T NODE
VOLTAGE
?V
?V1
R
ROUT
OUT
?V1
+
-
Vr
Vr
gm
gm
Vr
Vr
+
PWM
PWM
Comparator
Comparator
V1
V1
FB
FB
R
R11
R
R22
COMP
COMP
OUT
OUT
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP PIN
VOLTAGE
L
L
D
D
OUTPUT
VOLTAGE
C
C
R
R
R1
R1
t
t
T
T NODE
VOLTAGE
?V
?V1
R
ROUT
OUT
?V1
+
-
Vr
Vr
gm
gm
Vr
Vr
+
PWM
PWM
Comparator
Comparator
V1
V1
FB
FB
R
R11
R
R22
R
R11
R
R22



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


Scheda tecnica Scarica

Go To PDF Page


Link URL



Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   Collegamento alla scheda tecnica    |   scambio Link   |   Ricerca produttore
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