Datasheet LT3476 (Analog Devices) - 4

LT3476
typicAl perForMAnce chArActeristics TA = 25°C, unless otherwise noted. V(CAP-LED) Threshold vs VADJ Current Limit vs Duty Cycle Oscillator Frequency vs RT
150 2.5 10000 TA = 25°C TYPICAL 120 2 MINIMUM 90 1.5 (kHz) 1000 60 1 F OSC CURRENT LIMIT (A) V(CAP-LED) THRESHOLD (mV) 30 0.5 0 0 100 0 0.3 0.6 0.9 1.2 1.5 0 20 40 60 80 100 1 10 100 1000 VADJ (V) DUTY CYCLE (%) RT (kΩ) 3476 G01 3476 G02 3476 G03
V(CAP-LED) Threshold Switch Current Limit Oscillator Frequency vs Temperature, VADJ = VREF vs Temperature vs Temperature
108 2.5 1150 RT = 21k 107 1100 2 106 1050 1.5 105 1000 1 TOR FREQUENCY (kHz) 104 950 CURRENT LIMIT (A) V(CAP-LED) THRESHOLD (mV) 103 0.5 OSCILLA 900 102 0 850 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3476 G06 3476 G04 3476 G05
Reference Voltage V(CAP-LED) Threshold vs V(CAP) Quiescent Current
1.065 108 25 VADJ = 1.05V PWM 1-4 = 3.6V 107 1.060 20 106 V 1.055 15 C = GND, NOT SWITCHING T (V) A = 25°C 105 V REF 1.050 10 104 INPUT CURRENT (mA) PWM 1-4 = 0V 1.045 V(CAP-LED) THRESHOLD (mV) 5 103 1.040 102 0 –45 –20 5 30 55 80 105 130 0 5 10 15 20 25 30 35 0 4 8 12 16 TEMPERATURE (°C) VCAP (V) VIN (V) 3476 G07 3476 G08 3476 G09 3476fb 4 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