Datasheet LT3932, LT3932-1 (Analog Devices) - 7

LT3932/LT3932-1
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, unless otherwise noted. LED Current (Analog CTRL) LED Current (Digital CTRL) LED Voltage Limit
110 110 125 V 100 100 CTRL = 2V 90 90 100 80 80 70 70 (mV) 60 (mV) 60 (mV) 75 ISN 50 ISN 50 ISN - V – V 40 - V 40 50 V ISP 30 V ISP 30 V ISP 20 20 10 25 10 0 0 –10 –10 0 0 0.25 0.50 0.75 1 1.25 1.50 1.75 2 0 12.5 25 37.5 50 62.5 75 87.5 100 0.97 0.98 0.99 1 1.01 1.02 CTRL VOLTAGE (V) CTRL DUTY RATIO (%) FB VOLTAGE (V) 3932 G19 3932 G20 3932 G21
LED Current (100% Regulation) LED Current (5% Regulation) ISMON Voltage
300 300 2.0 155°C 300 UNITS 155°C 300 UNITS 270 25°C VCTRL = 1.5V 270 25°C VCTRL = 300mV –50°C 240 –50°C 240 1.5 210 210 180 180 TAGE (V) 150 150 1.0 120 120 NUMBER OF UNITS 90 NUMBER OF UNITS 90 ISMON VOL 0.5 60 60 30 30 0 0 0 98.8 99.2 99.6 100.0 100.4 100.8 101.2 4.8 4.9 5 5.1 5.2 5.3 5.4 0 50 100 150 200 250 300 VISP - VISN (mV) VISP - VISN (mV) VISP – VISN (mV) 3932 G22 3932 G23 3932 G24
Peak SW Current Limit LED Current Line Regulation LED Current vs VOUT
4.0 50.0 51.0 2 LEDs (APPROX. 6V) 2MHz SW FREQUENCY V 3.6 49.6 CTRL = 735mV 50.6 3.2 49.2 (mV) 50.2 (mV) ISN ISN - V - V 2.8 48.8 49.8 V ISP V ISP PEAK SW CURRENT (A) 2.4 48.4 49.4 VIN = 36V VCTRL = 750mV 2MHz SW FREQUENCY 2.0 48.0 49.0 10 30 50 70 90 0 6 12 18 24 30 36 0 6 12 18 24 30 36 DUTY RATIO (%) VIN VOLTAGE (V) VOUT VOLTAGE (V) 3932 G25 3932 G26 3932 G27 Rev B For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts