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AL8821 Fiches technique(PDF) 8 Page - Diodes Incorporated

No de pièce AL8821
Description  BOOST LED DRIVER
PDF  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  DIODES [Diodes Incorporated]
Site Internet  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AL8821 Fiches technique(HTML) 8 Page - Diodes Incorporated

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AL8821
Document number: DS37671 Rev. 2 - 2
8 of 14
www.diodes.com
February 2017
© Diodes Incorporated
AL8821
Application Information (Cont.)
(
1.5) 0.6 1.4
,1.5
5
16
0.088 , 0
1.5
COMP
COMP
LT
COMP
V
V
V
V
V
V
V 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 . 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.



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