công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

Preview PDF HTML

PM6670 bảng dữ liệu(PDF) 46 Page - STMicroelectronics

tên linh kiện PM6670
Giải thích chi tiết về linh kiện  Complete DDR2/3 memory power supply controller
PDF  53 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6670 bảng dữ liệu(HTML) 46 Page - STMicroelectronics

Back Button PM6670 Datasheet HTML 42Page - STMicroelectronics PM6670 Datasheet HTML 43Page - STMicroelectronics PM6670 Datasheet HTML 44Page - STMicroelectronics PM6670 Datasheet HTML 45Page - STMicroelectronics PM6670 Datasheet HTML 46Page - STMicroelectronics PM6670 Datasheet HTML 47Page - STMicroelectronics PM6670 Datasheet HTML 48Page - STMicroelectronics PM6670 Datasheet HTML 49Page - STMicroelectronics PM6670 Datasheet HTML 50Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 46 / 53 page
background image
Application information
PM6670
46/53
8.1.6
VDDQ current limit setting
The valley current limit is set by RCSNS and must be chosen to support the maximum load
current. The valley of the inductor current ILvalley is:
Equation 45
The output current limit depends on the current ripple as shown I Figure 41:
Figure 41. Valley current limit waveforms
As the valley threshold is fixed, the greater the current ripple, the greater the DC output
current will be. If an output current limit greater than ILOAD(max) over all the input voltage
range is required, the minimum current ripple must be considered in the previous formula.
Then the resistor RCSNS is:
Equation 46
where RDSon is the drain-source on-resistance of the low-side switch. Consider the
temperature effect and the worst case value in RDSon calculation (typically +0.4%/°C).
The accuracy of the valley current also depends on the offset of the internal comparator
(±5mV).
The negative valley-current limit (if the device works in forced-PWM mode) is given by:
Equation 47
2
I
(max)
I
I
L
LOAD
Lvalley
∆
−
=
Inductor current
Valley current limit
MAX LOAD 1
MAX LOAD 2
Current
Time
Inductor current
uA
100
I
R
R
Lvalley
DSon
CSNS
⋅
=
DSon
NEG
R
mV
120
I
=



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 50 51 52 53


bảng dữ liệu tải về

Go To PDF Page


Link URL



Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Liên kết đến bảng dữ liệu    |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
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