LT3486 Просмотр технического описания (PDF) - Linear Technology
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LT3486 Datasheet PDF : 20 Pages
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LT3486
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified.
Switching Waveforms
VSW2
50V/DIV
IL2
500mA/DIV
VSW1
10V/DIV
IL1
1A/DIV
VIN = 3.6V
0.5µs/DIV
8 LEDs/25mA
3486 G17
2 LEDs/320mA
CIRCUIT OF FRONT PAGE APPLICATION
PWM Dimming Wavforms
ILED
200mA/DIV
IL
500mA/DIV
PWM
5V/DIV
VIN = 12V
8/8 LEDs
0.2ms/DIV
PWM FREQ = 1kHz
3486 G18
LED Current vs PWM Duty Cycle
Wide Dimming Range (1000:1)
100 VIN = 12V
8/8 LEDs
PWM FREQ = 100Hz
10
1
0.1
0.01
0.01
0.1
1
10
PWM DUTY CYCLE (%)
100
3486 G01
SHDN Pin Bias Current
(CTRL1 = CTRL2 = 3V)
140
VIN = 3.6V
120
TA = 50°C
100
TA = 25°C
80
TA = 100°C
60
40
20
0
04
8 12 16 20 24
SHDN PIN VOLTAGE (V)
3486 G05
VFB vs VCTRL
250
VIN = 3.6V
TA = 25°C
200
150
100
50
0
0
0.5
1
1.5
2
CONTROL VOLTAGE (V)
3486 G03
Open-Circuit Output Clamp
Voltage vs Temperature
37
VIN = 3.6V
RT = 63.4k
36
VOUT2
VOUT1
35
34
33
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3486 G06
VFB vs VCTRL
(Temperature Variation)
250
± 5mV
TA = 85°C
200
TA = –50°C
150
TA = 25°C
100
50
0
0
0.5
1
1.5
2
CONTROL VOLTAGE (V)
3486 G04
Open-Circuit Output Clamp
Voltage vs VIN
37
VIN = 3.6V
RT = 63.4k
36
VOUT1
35
VOUT2
34
33
2 4 6 8 10 12 14 16 18 20 22 24
VIN (V)
3486 G07
3486fe
4
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