Datasheet

LT3596
6
3596fa
FB and LED Loop Regulation
Voltage LED Current LED Current Matching
LED Current vs PWM Duty Cycle LED Current vs CTRLn Voltage
Adaptive Loop Switching
Waveforms (with PWM Dimming)
Boost Diode Voltage Soft-Start 60V Buck Switching Waveforms
Typical perForMance characTerisTics
T
A
= 25°C, unless otherwise noted
CURRENT (mA)
0 25
0
BOOST DIODE VOLTAGE (V)
0.4
1.0
50
100
125
3596 G10
0.2
0.8
0.6
75
150
175
EN/UVLO
5V/DIV
SW
50V/DIV
V
OUT
20V/DIV
400µs/DIV
3596 G11
I
L
500mA/DIV
SW
20V/DIV
V
OUT
20V/DIV
400ns/DIV
3596 G12
I
L
500mA/DIV
TEMPERATURE (°C)
–50 –25
0.9
REGULATION VOLTAGE (V)
1.1
1.4
V
FB
0
50
75
3596 G13
1.0
1.3
1.2
25
100
125
V
LED
TEMPERATURE (°C)
–50
MATCHING (%)
0.75
25
3596 G15
0
–0.50
–25 0 50
–0.75
–1.00
1.00
0.50
0.25
–0.25
75 100 125
CH1
CH2
CH3
R
ISETn
= 20k
PWM DUTY CYCLE (%)
0.001
0.0001
LED CURRENT (mA)
0.001
0.01
0.1
1
10
100
0.01 0.1 1 10
3596 G16
100
R
ISETn
= 20k
CTRLn VOLTAGE (V)
0
0
LED CURRENT (mA)
25
50
75
100
0.25
0.5 0.75 1
3596 G17
1.25 1.5
R
ISETn
= 20k
I
LED
100mA/DIV
V
OUT
10V/DIV
V
LED
10V/DIV
V
SW
100V/DIV
200µs/DIV
3596 G18