数据搜索系统，热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

预览 PDF HTML

PM6675AS 数据表(PDF) 19 Page - STMicroelectronics

部件名 PM6675AS
功能描述  High efficiency step-down controller with embedded 2 A LDO regulator
PDF  48 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6675AS 数据表(HTML) 19 Page - STMicroelectronics

Back Button PM6675AS Datasheet HTML 15Page - STMicroelectronics PM6675AS Datasheet HTML 16Page - STMicroelectronics PM6675AS Datasheet HTML 17Page - STMicroelectronics PM6675AS Datasheet HTML 18Page - STMicroelectronics PM6675AS Datasheet HTML 19Page - STMicroelectronics PM6675AS Datasheet HTML 20Page - STMicroelectronics PM6675AS Datasheet HTML 21Page - STMicroelectronics PM6675AS Datasheet HTML 22Page - STMicroelectronics PM6675AS Datasheet HTML 23Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 19 / 48 page
background image
PM6675AS
Device description
19/48
Figure 24.
Switching section simplified block diagram
7.1.2
Output ripple compensation and loop stability
The loop is closed connecting the center tap of the output divider (internally, when the fixed
output voltage is chosen, or externally, using the VSEL pin in the adjustable output voltage
mode). The feedback node is the negative input of the error comparator, while the positive
input is internally connected to the reference voltage (Vr = 0.6 V). When the feedback
voltage becomes lower than the reference voltage, the PWM comparator goes high and sets
the control logic, turning on the high-side MOSFET. After the On-Time (calculated as
previously described) the system releases the high-side MOSFET and turns-on the
synchronous rectifier.
The voltage drop along ground and supply PCB paths, used to connect the output capacitor
to the load, is a source of DC error. Further the system regulates the output voltage valley,
not the average, as shown in Figure 22. Thus, the voltage ripple on the output capacitor is
an additional source of DC error. To compensate this error, an integrative network is
introduced in the control loop, by connecting the output voltage to the COMP pin through a
capacitor (CINT) as shown in Figure 25.
+
-
H
HS
S
L
Le
ev
ve
ell
s
sh
hiifftte
err
L
LS
S
Q
Q
R
S
T
To
on
n--m
miin
n
Anti cross-
conduction
circuitry
T
To
offff--m
miin
n
Q
R
S
+
-
P
PW
WM
M C
Co
om
mp
pa
arra
atto
orr
P
Po
os
siittiiv
ve
e C
Cu
urrrre
en
ntt L
Liim
miitt c
co
om
mp
pa
arra
atto
orr
0
0..6
6V
V
Q
Q
R
S
+
_
M
Miin
n ffs
sw
w
c
co
ou
un
ntte
err
Z
Ze
erro
o--c
crro
os
ss
siin
ng
g
C
Co
om
mp
pa
arra
atto
orr
b
ba
an
nd
dg
ga
ap
p
1
1..2
23
36
6V
V
P
PH
HA
AS
SE
E
P
PG
GN
ND
D
L
LG
GA
AT
TE
E
B
BO
OO
OT
T
C
CS
SN
NS
S
+
C
CO
OM
MP
P
g
gm
m
IIn
ntte
eg
grra
atto
orr
V
VS
SN
NS
S
V
VB
BG
G
V
VB
BG
G
P
PU
UL
LS
SE
E -- S
SK
KIIP
P
V
VS
SE
EL
L
VSEL<4V
1-Shot generator
T
To
on
n
V
VS
SN
NS
S
V
VO
OS
SC
C
0
0..6
6V
V
1
10
00
0u
uA
A
500mV
2.5V
2.5V
+
-
-
-
+
+
H
HG
GA
AT
TE
E
V
VR
RE
EF
F
S
SG
GN
ND
D
V
VO
OS
SC
C
V
VO
OS
SC
C
V
VC
CC
C



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


数据表 下载

Go To PDF Page


链接网址



ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   数据表链接    |   链接交换   |   制造商名单
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