Thermally enhanced Low V
FB
Step-Down LED Driver
ADT6780
Typical Operating Characteristics
VIN=12V, Load : 1A / one 4W White LED and Ta=25℃, unless otherwise noted
Enable Start-up
(C4=100nF)
V
SW
10V/div
V
EN
5V/div
V
SW
10V/div
V
EN
5V/div
V
OUT
2V/div
Enable Turn-off
(C4=100nF)
V
OUT
2V/div
I
LED
0.5A/div
1㎳/div
I
LED
0.5A/div
40㎲/div
Enable Start-up
(C4 open)
V
SW
10V/div
V
EN
5V/div
V
SW
10V/div
V
EN
5V/div
V
OUT
2V/div
Enable Turn-off
(C4 open)
V
OUT
2V/div
I
LED
0.5A/div
40㎲/div
I
LED
0.5A/div
40㎲/div
PWM Dimming Through Enable
(C4 open, PWM Frequency=500Hz, Duty=50%)
V
EN
5V/div
LED Current (A)
V
OUT
2V/div
V
SW
10V/div
I
LED
1A/div
1㎳/div
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
LED Current vs PWM Dimming Duty
(C4 open, PWM Frequency=500Hz)
0
20
40
60
80
100
PWM Dimming Duty (%)
* This specifications are subject to be changed without notice
Jul. 12. 2012 / Preliminary
6/13
http://www.ad-tech.co.kr
ADTECH [ ADTECH ]
