Ap8801, 500ma led step-down converter, Typical characteristics – Diodes AP8801 User Manual
Page 4
AP8801
500mA LED STEP-DOWN CONVERTER
AP8801
Document number: DS31765 Rev. 7 - 2
4 of 14
June 2012
© Diodes Incorporated
Typical Characteristics
INPUT VOLTAGE (V)
Figure. 2 Supply Current (not switching) vs. Input Voltage
0
60
5
55
10 15 20 25 30 35 40
50
45
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
C
H
IN
G
S
U
P
P
L
Y
C
U
R
R
E
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
C
T
R
L V
O
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
R
RESISTANCE ( )
Figure. 5 LED Current vs. R
SET
SET
Ω
0
0.5
1.5
2.0
1.0
0
300
250
500
450
50
LE
D
C
U
R
R
E
N
T
(mA
)
400
200
100
350
150
CTRL VOLTAGE (V)
Figure. 6 LED Current vs. V
CTRL
0
2.5
0.5
1.0
1.5
2.0
0
400
300
600
500
100
LE
D
C
U
R
R
EN
T
(mA
)
200
R
= 0.56
SET
Ω
R
= 0.68
SET
Ω
R
= 1.33
SET
Ω
CTRL VOLTAGE (V)
Figure. 7 Switching Frequency vs. V
CTRL
0
2.5
0.5
1.0
1.5
2.0
0
500
400
800
700
100
SW
IT
C
H
IN
G
F
R
E
Q
U
E
N
C
Y
(k
H
z)
300
600
200