Ap8802, 1a led step-down converter, Typical characteristics – Diodes AP8802 User Manual
Page 5
AP8802
1A LED STEP-DOWN CONVERTER
AP8802
Document number: DS31766 Rev. 9 - 2
5 of 19
www.diodes.com
May 2012
© Diodes Incorporated
Typical Characteristics
INPUT VOLTAGE (V)
Figure. 2 Supply Current (not switching) vs. Input Voltage
0
48
4
44
8 12 16 20 24 28 32
40
36
0.1
0
0.3
0.2
0.7
0.6
0.9
0.8
0.5
0.4
N
O
N-
S
W
IT
CH
ING
S
U
P
P
L
Y
C
U
R
RE
N
T
(m
A
)
AMBIENT TEMPERATURE (°C)
Figure. 3 V
vs. Ambient Temperature
CTRL
-40
125
-25
110
-10
5
20
35 50 65
95
80
1.244
1.252
1.250
1.256
1.254
1.248
1.246
CTR
L
VO
L
T
A
G
E (
V)
-40 -25 -10
5
20 35 50 65 80 95 110 125
AMBIENT TEMPERATURE (°C)
Figure. 4 R
vs. Ambient Temperature
DS(ON)
1.2
1.0
0.8
0.6
0.4
0.2
0
R
()
DS
(O
N)
Ω
0
0.5
1.0
1.5
2.0
2.5
1000
900
800
700
600
500
200
100
0
400
300
LE
D
C
U
R
R
EN
T
(m
A
)
R
RESISTANCE ( )
SET
Ω
Figure. 5 LED Current vs. R
SET
0
0.5
1
1.5
2
2.5
CTRL VOLTAGE (V)
Figure. 6 LED Current vs. V
CTRL
0
200
1000
1200
600
800
400
LE
D
C
U
R
R
E
N
T
(m
A
)
R
= 0.2
SET
Ω
R
= 0.3
SET
Ω
R
= 0.68
SET
Ω
CTRL VOLTAGE (V)
Figure. 7 Switching Frequency vs. V
CTRL
0
2.5
0.5
1
1.5
2
0
500
400
800
700
100
S
W
IT
CH
IN
G
FRE
Q
U
E
NCY
(k
H
z
)
300
600
200