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

X  

Preview PDF HTML

LED7707TR bảng dữ liệu(PDF) 33 Page - STMicroelectronics

tên linh kiện LED7707TR
Giải thích chi tiết về linh kiện  6-rows 85 mA LEDs driver with boost regulator for LCD panels backlight
PDF  48 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED7707TR bảng dữ liệu(HTML) 33 Page - STMicroelectronics

Back Button LED7707TR Datasheet HTML 29Page - STMicroelectronics LED7707TR Datasheet HTML 30Page - STMicroelectronics LED7707TR Datasheet HTML 31Page - STMicroelectronics LED7707TR Datasheet HTML 32Page - STMicroelectronics LED7707TR Datasheet HTML 33Page - STMicroelectronics LED7707TR Datasheet HTML 34Page - STMicroelectronics LED7707TR Datasheet HTML 35Page - STMicroelectronics LED7707TR Datasheet HTML 36Page - STMicroelectronics LED7707TR Datasheet HTML 37Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 33 / 48 page
background image
LED7707
Application information
33/48
Equation 25
where D is the duty-cycle defined as:
Equation 26
whereas R0 is:
Equation 27
and
Equation 28
The output voltage in the above calculations is considered as the maximum value (LED with
the maximum forward voltage connected to the leading generator):
Equation 29
Considering the input voltage range, the lower LB will be at the lower input voltage. Hence
the condition to assure the DCM operation becomes:
Equation 30
An inductor value of 4.7 µH could be a suitable value, considering also a margin from the
boundary condition.
It is important to highlight that the inductor choice involves not only the value itself but the
saturation current (higher than the current limit, see Section 6.4.4), the rated RMS current
(the compliance with the saturation current might be not enough; also the thermal
performances must be taken into account), the DCR (which affects the efficiency) and the
size (in some application might be a strict requirement).
However the DCR can’t be reduced keeping the size small. Hence a trade off between these
two requirements must be achieved according to the application.
(
)
SW
2
0
B
F
2
D
1
D
R
L
⋅
−
⋅
⋅
=
⎩
⎨
⎧
=
=
=
−
=
V
2
.
13
V
@
50
.
0
V
8
.
10
V
@
59
.
0
V
V
1
D
max
,
IN
min
,
IN
OUT
IN
Ω
=
=
74
I
V
R
OUT
OUT
0
mA
360
I
6
I
ROW
OUT
=
⋅
=
V
6
.
26
mV
700
V
7
V
max
,
LEDs
,
F
max
,
OUT
=
+
⋅
=
(
)
H
6
.
5
V
L
L
min
,
IN
B
μ
=
<



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


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