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

X  

预览 PDF HTML

ST1S14 数据表(PDF) 29 Page - STMicroelectronics

部件名 ST1S14
功能描述  Power good open collector output
PDF  46 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST1S14 数据表(HTML) 29 Page - STMicroelectronics

Back Button ST1S14 Datasheet HTML 25Page - STMicroelectronics ST1S14 Datasheet HTML 26Page - STMicroelectronics ST1S14 Datasheet HTML 27Page - STMicroelectronics ST1S14 Datasheet HTML 28Page - STMicroelectronics ST1S14 Datasheet HTML 29Page - STMicroelectronics ST1S14 Datasheet HTML 30Page - STMicroelectronics ST1S14 Datasheet HTML 31Page - STMicroelectronics ST1S14 Datasheet HTML 32Page - STMicroelectronics ST1S14 Datasheet HTML 33Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 29 / 46 page
background image
DocID17977 Rev 2
29/46
ST1S14
Application information
so the output voltage is:
Equation 34
Equation 29 and 30, in overcurrent conditions, can be simplified to:
Equation 35
considering TON which has already been reduced to its minimum.
Equation 36
where TSW=1/fSW and considering the nominal fSW.
The voltage divider introduces a gain factor K between the VO_SET and VFB that affect the
effectiveness of the current protection. The worst case scenario is the minimum K, that is
the minimum output voltage, over the input voltage (Chapter 5.2: Minimum output voltage
over VIN range).
As a consequence the minimum feedback voltage to keep the inductor current limited over
the input voltage range can be expressed making Equation 35 equal to Equation 36 and
expressing VO_SET as given in Equation 1:
Equation 37
Equation 37 expresses the worst case scenario as it considers the minimum K gain of the
voltage divider over the entire input voltage range. The Figure 16 plots the Equation 37
considering the minimum value of the peak current limit given in Table 6: Electrical
characteristics on page 8.
V
O
V
FB
1
R
1
R
2
-------
+
⎝⎠
⎛⎞
⋅
V
FB
V
O_SET
1.22
-------------------
⋅
==
I
L TON
Δ
V
IN
DCR
L
R
DSON
+
() I
⋅
–
L
------------------------------------------------------------------- T
ON MIN
()
V
IN
L
--------- 90ns
()
≅
=
I
L TOFF
Δ
V
D
V
O_MIN
DCR
L
I
⋅
++
()
–
L
------------------------------------------------------------------------ T
SW
90ns
–
()
V
D
V
FB
V
O_SET
1.22
-------------------
⋅
DCR
L
I
⋅
++
⎝⎠
⎛⎞
–
L
-------------------------------------------------------------------------------------------- 1.18
μs
()
≅
=
V
FB VIN
()
1.22
1.22
T
SW
⋅
V
IN
T
ON_MIN
⋅
--------------------------------------
V
D
I
L
DCR
⋅
()
+
()
⋅
⎝⎠
⎛⎞
–
=



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


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