Datasheet LT3932, LT3932-1 (Analog Devices) - 8

LT3932/LT3932-1
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, unless otherwise noted. FB OPENLED Threshold FB SHORTLED Threshold Power Switch On-Resistance
1.10 0.40 300 RISING RISING TOP SWITCH FALLING FALLING BOTTOM SWITCH 1.05 0.35 250 1.00 0.30 200 TAGE (V) 0.95 TAGE (V) 0.25 150 ANCE (mOhm) FB VOL 0.90 FB VOL 0.20 100 RESIST 0.85 0.15 50 0.80 0.10 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3932 G28 3932 G29 3932 G30
Efficiency vs VIN Efficiency vs ILED Regulated FB Voltage
100 100 1.02 400kHz 5 LEDs (APPROX. 15V) 2MHz 4 LEDs (APPROX. 12V) 1.01 95 95 1.00 90 90 TAGE (V) 0.99 EFFICIENCY (%) EFFICIENCY (%) FB VOL 85 85 0.98 VIN = 24V VCTRL = 2V 2 LEDs (APPROX. 6V, 1A) 2MHz SW FREQUENCY VISP – VISN = 0V 80 80 0.97 5 10 15 20 25 30 35 40 0 400 800 1200 1600 2000 –50 –25 0 25 50 75 100 125 150 VIN VOLTAGE (V) ILED (mA) TEMPERATURE (°C) 3932 G31 3932 G32 3932 G33
PWMTG Voltage PWM Driver Propagation Delay FB OVLO Threshold
12 250 1.100 TURN–ON RISING 225 TURN–OFF FALLING 11 200 1.050 (V) Y (ns) 10 175 PWMTG 150 TAGE (V) 1.000 – V TION DELA 9 125 AGA FB VOL V OUT 100 PROP 0.950 8 CPWMTG = 2.2nF (X7R) V 75 OUT = 20V DATA INCLUDES CAPACITANCE VPWM = 2V VARIATION WITH TEMPERATURE 7 50 0.900 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3932 G34 3932 G35 3932 G36 Rev B 8 For more information www.analog.com 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