Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

Preview PDF HTML

AL8821 Folha de dados(PDF) 8 Page - Diodes Incorporated

Nome de Peças AL8821
Descrição Electrónicos  40V, 2A BOOST LED DRIVER
PDF  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  DIODES [Diodes Incorporated]
Página de início  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AL8821 Folha de dados(HTML) 8 Page - Diodes Incorporated

Back Button AL8821 Datasheet HTML 4Page - Diodes Incorporated AL8821 Datasheet HTML 5Page - Diodes Incorporated AL8821 Datasheet HTML 6Page - Diodes Incorporated AL8821 Datasheet HTML 7Page - Diodes Incorporated AL8821 Datasheet HTML 8Page - Diodes Incorporated AL8821 Datasheet HTML 9Page - Diodes Incorporated AL8821 Datasheet HTML 10Page - Diodes Incorporated AL8821 Datasheet HTML 11Page - Diodes Incorporated AL8821 Datasheet HTML 12Page - Diodes Incorporated Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 14 page
background image
AL8821
Document number: DS37671 Rev. 1 - 2
8 of 14
www.diodes.com
January 2015
© Diodes Incorporated
AL8821
Application Information (Cont.)
(
1.5) 0.6 1.4
,1.5
5
16
88
, 0
1.5
COMP
COMP
LT
COMP
V
mV
V
V
V
V
mV V
V
V

 

The range of VCOMP is from 0V to 5V.
The upper threshold depends on the lower threshold and the hysteresis value. The hysteresis value is set by external resister RHYS. It is defined as
below.
100
HYS
HYS
V
R
A

According to the operation principle , the peak to peak current
∆IL and the valley current IL(val) can be obtained by the below equations.
SET
LT
val
L
R
V
I
)
(
SET
HYS
L
R
V
I 
Where:
∆IL is the peak to peak current of inductor.
IL(val) is the valley current of inductor.
From the Figure 2, the relationship between IL(peak), IL(val), IL(ave) and ∆IL can be obtained as below.
L
val
L
peak
L
I
I
I
)
(
)
(
L
val
L
ave
L
I
I
I
2
1
)
(
)
(
Where:
IL(peak) is the peak current of inductor.
IL(ave) is the average current of inductor.
As we know the average current IL(ave) depends on the output power, rated input voltage VIN1 of step-up converter and total efficiency η. So the
average current IL(ave) can be obtained by the following equation.
1
)
(
)
444
.
0
(
IN
LED
LED
ave
L
V
I
V
I
Where: VLED is the voltage in LEDs.
Set ratio of
∆IL to IL(peak) as K.



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14


Folha de dados Download

Go To PDF Page


Ligação URL



ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   Link para a ficha técnica    |   roca de Link   |   Lista de Fabricantes
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