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AL8820SP-13 Datasheet(PDF) 8 Page - Diodes Incorporated

Part # AL8820SP-13
Description  40V, 2A BOOST/BUCK LED DRIVER
Download  15 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AL8820SP-13 Datasheet(HTML) 8 Page - Diodes Incorporated

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AL8820
Document number: DS37369 Rev. 1 - 2
8 of 15
www.diodes.com
December 2014
© Diodes Incorporated
AL8820
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.
1
)
(
SET
LT
val
L
R
V
I
1
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 boost converter and total efficiency η. So the
average current IL(ave) can be obtained by the below equation.
1
)
(
IN
LED
LED
ave
L
V
I
V
I
Where:


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