User Manual

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
0484448 121620242832 4036
0.1
0
0.3
0.2
0.7
0.6
0.9
0.8
0.5
0.4
NON-SWITCHING SUPPLY CURRENT (mA)
AMBIENT TEMPERATURE (°C)
Figure. 3 V vs. Ambient Temperature
CTRL
-40 125-25 110-10520355065 9580
1.244
1.252
1.250
1.256
1.254
1.248
1.246
CTRL VOLTAGE (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(ON)
Ω
0 0.5 1.0 1.5 2.0 2.5
1000
900
800
700
600
500
200
100
0
400
300
LED
C
U
R
R
EN
T
(mA)
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
LED
C
U
R
R
E
N
T
(mA)
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
02.50.5 1 1.5 2
0
500
400
800
700
100
SWITCHING FREQUENCY (kHz)
300
600
200