Datasheet LT3597 (Analog Devices) - 6

LT3597
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Boost Diode VF Soft-Start 60V Switching Waveforms
800 700 –40°C VEN/UVLO 5V/DIV V 600 SW 25°C 20V/DIV V 500 SW 20V/DIV (mV) 125°C F 400 IL 100mA/DIV DIODE V 300 IL 100mA/DIV 200 V V OUT OUT 100 20V/DIV 20V/DIV 0 0 2 4 6 8 10 3597 G11 400µs/DIV 3597 G12 400ns/DIV DIODE CURRENT (mA) 3597 G10
Loop Regulation Voltage LED Current LED Current Matching
1.4 103 0.50 102 1.3 VFB 0.25 101 CH3 1.2 CH1 CH2 100 CH3 0 CH1 VOLTAGE (V) 1.1 VLED (ADAPTIVE LOOP) LED CURRENT (mA) 99 CH2 –0.25 1.0 98 LED CURRENT MATCHING (%) 0.9 97 –0.50 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3597 G13 3597 G14 3597 G15
LED Current vs PWM Duty Cycle LED Current vs CTRL Adaptive Loop Operation
100 120 10 100 ILED 100mA/DIV 1 80 VOUT 10V/DIV 0.1 60 VLED 10V/DIV 0.01 40 LED CURRENT (mA) LED CURRENT (mA) VSW 0.001 20 20V/DIV 0.0001 0 0.001 0.01 0.1 1 10 100 0 0.25 0.5 0.75 1 1.25 1.5 3597 G18 400µs/DIV DUTY CYCLE (%) CTRL VOLTAGE (V) 3597 G16 3597 G17 3597fa 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts