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
100%
95%
90%
Efficiency
VIN=6V
V
SW
10V/div
VIN=12V
VIN=24V
V
OUT
(AC)
20mV/div
I
INDUCTOR
0.5A/div
Steady State Operation
Efficiency (%)
85%
80%
75%
70%
65%
60%
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1㎲/div
LED Current (A)
VFB vs Die Temperature
0.216
0.212
0.208
0.204
0.200
0.196
0.192
0.188
0.184
-40
-20
0
20
40
60
80
100
120
Switching Frequency vs Die Temperature
1050
Switching Frequency (kHz)
1000
Feedback Voltage (V)
950
900
850
800
750
-40
-20
0
20
40
60
80
100
120
Temperature (℃)
Temperature (℃)
Output Short
4.0
Peak Current vs Duty
3.5
Inductor Peak Current (A)
4㎲/div
V
OUT
2V/div
3.0
V
SW
10V/div
I
INDUCTOR
2A/div
2.5
2.0
1.5
1.0
0
20
40
60
80
100
Duty (%)
* This specifications are subject to be changed without notice
Jul. 12. 2012 / Preliminary
5/13
http://www.ad-tech.co.kr
ADTECH [ ADTECH ]
