Datasheet LT3519, LT3519-1, LT3519-2 (Analog Devices) - 4

LT3519/LT3519-1/LT3519-2
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Switch Current Limit VISP-VISN Threshold vs VCTRL vs Duty Cycle VREF Voltage vs Temperature
300 1200 2.04 VIN = 12V VIN = 12V V 250 ISP = 24V 2.03 1100 2.02 200 1000 2.01 150 (V) 900 2.00 REF THRESHOLD (mV) 100 V ISN 1.99 -V 800 50 ISP 1.98 V SWITCH CURRENT LIMIT (mA) 0 700 1.97 –50 600 1.96 0 0.5 1.0 1.5 2.0 0 25 50 75 100 –50 –25 0 25 50 75 100 125 VCTRL (V) DUTY CYCLE (%) TEMPERATURE (°C) 3519 G01 3519 G02 3519 G03
VISP-VISN Threshold Switch Current Limit Oscillator Frequency vs Temperature vs Temperature vs Temperature (LT3519)
260 1200 420 V V IN = 12V IN = 12V 258 VISP = 24V 1100 410 256 VCTRL = 2V 254 1000 400 252 250 900 390 THREHSOLD (mV) 248 ISN 800 -V 246 FREQUENCY (kHz) 380 ISPV 244 SWITCH CURRENT LIMIT (mA) 700 370 242 240 600 360 –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) 3519 G04 3519 G05 3519 G06
VISP-VISN Threshold vs VISP VREF Voltage vs VIN Quiescent Current vs VIN
260 2.04 3.0 VIN = 12V 258 VCTRL = 2V 2.03 2.5 256 2.02 254 2.0 252 2.01 (V) 250 2.00 1.5 REF THRESHOLD (mV) V 248 CURRENT (mA) ISN 1.99 IN -V 1.0 246 V ISP 1.98 V 244 0.5 1.97 242 VPWM = 5V VFB = 1.5V 240 1.96 0 0 10 20 30 40 50 0 5 10 15 20 25 30 35 40 0 10 20 30 40 VISP (V) VIN (V) VIN (V) 3519 G07 3519 G08 3519 G09 3519fa 4