Datasheet LT3595 (Analog Devices) - 4

LT3595
TYPICAL PERFORMANCE CHARACTERISTICS PWM Dimming Waveforms PWM Dimming Waveforms Switching Waveforms (1000:1) (10:1)
10 LEDS VSW1 50V/DIV PWM PWM 5V/DIV 5V/DIV 10 LEDS IL1 50mA/DIV I I L L 5 LEDS 20mA/DIV 20mA/DIV VSW2 50V/DIV I I LED LED 5 LEDS 20mA/DIV 20mA/DIV IL2 50mA/DIV 3595 G01 3595 G02 3595 G03 400ns/DIV 2μs/DIV 2ms/DIV VIN = 45V V V PWM FREQUENCY = 100Hz IN = 40V PWM FREQUENCY = 100Hz IN = 40V ILED = 20mA 10 LEDS AT 20mA T 10 LEDS AT 20mA T ON = 10μs ON = 1ms
LED Current vs PWM Duty Cycle Wide Dimming Range (5000:1) LED Current vs RSET Resistance VIN Quiescent Current
100 60 2.0 VIN = 45V 10 LEDS AT 20mA T = 125°C PWM FREQUENCY = 100Hz 50 10 1.6 T = 25°C 40 T = – 40°C 1 1.2 30 0.1 CURRENT (mA) 0.8 20 IN LED CURRENT (mA) LED CURRENT (mA) V 0.01 0.4 10 0.001 0 0 0.01 0.1 1 10 100 25 50 75 100 125 150 0 10 20 30 40 50 DUTY CYCLE (%) RSET RESISTANCE (kΩ) VIN (V) 3595 G04 3595 G05 3595 G06
VCC Quiescent Current
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S
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H
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D
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N Pin Bias Current
20 V 100 CC = 3.3V T = 125°C 18 T = 25°C 16 T = –40°C 80 14 T = 25°C 12 60 μA) 10 ( T = –40°C T = 125°C CURRENT (mA) 8 I SHDN 40 CCV 6 4 20 2 0 0 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 VCC (V) VSHDN (V) 3595 F07 3595 F08 3595f 4