Datasheet LT3595A (Analog Devices) - 4

LT3595A
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 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 IL IL 5 LEDS 20mA/DIV 20mA/DIV VSW2 50V/DIV ILED ILED 5 LEDS 20mA/DIV 20mA/DIV IL2 50mA/DIV 3595A G01 3595A G02 3595A G03 400ns/DIV 2μs/DIV 2ms/DIV VIN = 45V VIN = 40V PWM FREQUENCY = 100Hz VIN = 40V PWM FREQUENCY = 100Hz ILED = 20mA 10 LEDS AT 20mA tON = 10μs 10 LEDS AT 20mA tON = 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) 3595A G04 3595A G05 3595A G06
VCC Quiescent Current SHDN Pin Bias Current
20 100 VCC = 3.3V T = 125°C 18 T = 25°C 16 80 T = –40°C 14 T = 25°C 12 60 10 (mA) 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) SHDN (V) 3595A F07 3595A F08 3595af 4