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AL8812FDF-13

P1-P3P4-P6P7-P9P10-P11
AL8812
Document number: DS37099 Rev. 1 - 2
7 of 11
www.diodes.com
March 2014
© Diodes Incorporated
A
L8812
Typical Application Circuits (cont.)
Boost Converter
Test Conditions Results
Line Regulation
V
in
= 9V to 12V, I
O
= 200mA
20mV = ±0.035%
Load Regulation
V
in
= 12V, I
O
= 50mA to 200mA
15mV = ±0.035%
Output Ripple
V
in
= 12V, I
O
= 200mA 500mV
PP
Efficiency
V
in
= 12V, I
O
= 200mA
80%
AL8812
Document number: DS37099 Rev. 1 - 2
8 of 11
www.diodes.com
March 2014
© Diodes Incorporated
A
L8812
Typical Application Circuits (cont.)
Buck Converter
Test Conditions Results
Line Regulation
V
in
= 12V to 24V, I
O
= 500mA
20mV = ±0.2%
Load Regulation
V
in
= 24V, I
O
= 50mA to 500mA
5mV = ±0.05%
Output Ripple
V
in
= 24V, I
O
= 500mA 160mV
PP
Efficiency
V
in
= 24V, I
O
= 500mA
82%
AL8812
Document number: DS37099 Rev. 1 - 2
9 of 11
www.diodes.com
March 2014
© Diodes Incorporated
A
L8812
Design Formula Table
Calculation Boost Buck
t
ON
/ t
off
V
OUT
+ V
F
-V
IN
min
V
OUT
+ v
F
V
IN
(
min
)
- V
sa
t
V
IN
(
min
)
- V
SAT
- V
OUT
( t
ON
+ t
off
)
1/f 1/f
t
off
t
ON
+ t
OFF
t
ON
+ t
OFF
t
ON
+1
t
ON
+1
t
OFF
t
OFF
t
ON
( t
ON
+t
OFF
) - t
OFF
( t
ON
+t
OFF
) - t
OFF
C
T
4.0×10
-
5
t
ON
4.0×10
-
5
t
ON
I
p
k
(switch) 2I
OUT
(
max
)
(t
ON
/ t
off
+1) 2I
OUT
(
max
)
R
sc
0.3 / I
p
k
(
switch
)
0.3 / I
p
k
(
switch
)
L
(min)
( V
IN
(
min
)
– V
sat
)
t
on (max)
( V
IN
(
min
)
– V
SAT
-V
OUT
)
ON (max)
I
p
k
(
switch
)
I
p
k
(
switch
)
C
O
9
I
OUT
t
ON
I
p
k
(
switch
)
( t
OFF
+ t
ON
)
V
ri
pp
le
(pp)
8V
ri
pp
le
(pp)
V
sat
= Saturation voltage of the output switch.
V
F
= Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
V
IN
- Nominal input voltage.
V
OUT
- Desired output voltage, |V
OUT
| = 1.25 (1+R2/R1)
I
OUT
- Desired output current.
f
min
- Minimum desired output switching frequency at the selected values of V
in
and I
o
.
V
ripple(pp)
- Desired peak-to-peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its
equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and
load regulation.
P1-P3P4-P6P7-P9P10-P11

AL8812FDF-13

Mfr. #:
Buy AL8812FDF-13
Manufacturer:
Diodes Incorporated
Description:
Switching Voltage Regulators LED LV Int Switch
Lifecycle:
New from this manufacturer.
Delivery:
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