Datasheet LT3744 (Analog Devices) - 8

LT3744
Typical perForMance characTerisTics Regulated Sense Voltage LED Current Regulation Accuracy LED Current Regulation Accuracy
70 100 300 ANALOG DIMMING LIMITED TO 125°C 380 TYPICAL UNITS 125°C 380 TYPICAL UNITS VCTRLX = 75mV (20:1) 90 60 25°C VCTRL1 = 1.5V 25°C VCTRL1 = 0V 250 80 –45°C –45°C 50 (mV) 70 200 40 60 LED_ISN 50 150 - V 30 40 100 20 NUMBER OF UNITS 30 NUMBER OF UNITS V LED_ISP 20 10 50 10 0 0 0 0 0.25 0.5 0.75 1.0 1.25 1.50 1.75 2.0 59 59.4 59.8 60.2 60.6 61 –300 –200 –100 0 100 200 300 VCTRLx (V) REGULATED VLED_ISP - VLED_ISN VOLTAGE (mV) REGULATED VLED_ISP - VLED_ISN VOLTAGE (µV) 3744 G19 3744 G20 3744 G21
Feedback Voltage VFB Load Regulation SS "Finished” Threshold
1.235 1.0 4.00 1.23 3.90 0.8 3.80 1.225 3.70 1.22 0.6 3.60 (V) TAGE (V) 1.215 3.50 V FB 1.21 0.4 3.40 SS PIN VOL 3.30 1.205 0.2 3.20 1.2 NORMALIZED LOAD CURRENT (A/A) 3.10 1.195 0 3.00 –50 –25 0 25 50 75 100 125 1.2 1.205 1.21 1.215 1.22 1.225 1.23 1.235 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) VFB (V) TEMPERATURE (°C) 3744 G22 3744 G23 3744 G23a
Average Current Regulation During Start-Up Falling C/10 Threshold Overcurrent Threshold
80 160 120 125°C 380 TYPICAL UNITS 70 140 25°C 110 –45°C 60 120 100 RISING THRESHOLD 50 100 90 (mV) (mV) 40 80 80 -V ISN V ISN - FALLING THRESHOLD V ISP 30 60 70 NUMBER OF UNITS V ISP 20 40 60 VIN = 3.3V 10 VIN = 12V 20 50 VIN = 36V 0 0 40 –50 –25 0 25 50 75 100 125 4.4 4.8 5.2 5.6 6.0 6.4 6.8 7.2 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) VLED_ISP - VLED_ISN C/10 THRESHOLD (mV) TEMPERATURE (°C) 3744 G24 3744 G25 3744 G26 3744fa 8 For more information www.linear.com/LT3744 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 Typical Application Related Parts