LT3486
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Waveforms
V
SW2
50V/DIV
I
L2
500mA/DIV
V
SW1
10V/DIV
I
L1
1A/DIV
0.5µs/DIV
V
IN
= 3.6V
8 LEDs/25mA
2 LEDs/320mA
CIRCUIT OF FRONT PAGE APPLICATION
3486 G17
T
A
= 25°C unless otherwise specified.
PWM Dimming Wavforms
I
LED
200mA/DIV
I
L
500mA/DIV
PWM
5V/DIV
V
IN
= 12V
0.2ms/DIV
8/8 LEDs
PWM FREQ = 1kHz
3486 G18
LED Current vs PWM Duty Cycle
Wide Dimming Range (1000:1)
100
V
IN
= 12V
8/8 LEDs
PWM FREQ = 100Hz
FEEDBACK VOLTAGE (mV)
250
200
V
FB
vs V
CTRL
V
IN
= 3.6V
T
A
= 25°C
FEEDBACK VOLTAGE (mV)
250
V
FB
vs V
CTRL
(Temperature Variation)
± 5mV
200
T
A
= –50°C
T
A
= 25°C
T
A
= 85°C
10
I
LED
(mA)
150
100
150
100
1
0.1
50
50
0.01
0.01
1
10
0.1
PWM DUTY CYCLE (%)
100
3486 G01
0
0
1
0.5
1.5
CONTROL VOLTAGE (V)
2
3486 G03
0
0
1
0.5
1.5
CONTROL VOLTAGE (V)
2
3486 G04
SHDN
Pin Bias Current
(CTRL1 = CTRL2 = 3V)
140
SHDN
PIN BIAS CURRENT (µA)
120
100
80
60
40
20
0
0
4
16
12
8
SHDN
PIN VOLTAGE (V)
20
24
3486 G05
Open-Circuit Output Clamp
Voltage vs Temperature
37
V
IN
= 3.6V
R
T
= 63.4k
OUTPUT CLAMP VOLTAGE (V)
V
OUT2
V
OUT1
35
37
Open-Circuit Output Clamp
Voltage vs V
IN
V
IN
= 3.6V
R
T
= 63.4k
VIN = 3.6V
TA = 50°C
OUTPUT CLAMP VOLTAGE (V)
TA = 25°C
TA = 100°C
36
36
V
OUT1
35
V
OUT2
34
34
33
–50
–25
75
0
25
50
TEMPERATURE (°C)
100
125
33
2
4
6
8 10 12 14 16 18 20 22 24
V
IN
(V)
3486 G07
3486 G06
3486fe
4
LINER [ LINEAR TECHNOLOGY ]
