Datasheet

5
dc1666af
DEMO MANUAL DC1666A
Quick start proceDure
Figure 2. DC1666A Efficiency with 25V LEDs at 2A
Figure 3. DC1666A 100Hz 50:1 PWM Dimming
Waveforms at 12V
IN
and 25V
LED
at 2A
INPUT VOLTAGE (V)
0
80
EFFICIENCY (%)
84
88
92
10
20
30 40
3791 TA02b
50
96
100
82
86
90
94
98
60
BUCK
BOOST
BUCK-BOOST
PWM
5V/DIV
I
L1
2A/DIV
I
LED
2A/DIV
50µs/DIV
3791 TA02c
Figure 4. DC1666A CTRL LED Current Foldback at Low V
IN
with UVLO Falling and Rising and OVLO
INPUT VOLTAGE (V)
UVLO
(FALLING)
TURN-ON
(RISING)
3
0
I
LED
(A)
4
5
6 7
DC1666A F04
8
1.0
2.0
0.5
1.5
9 10 50 55 60
TURN-ON
(FALLING)
OVLO
(RISING)