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