Datasheet LT3952A (Analog Devices) - 7

LT3952A
TYPICAL PERFORMANCE CHARACTERISTICS INTVCC Current Limit Reference Voltage vs Temperature VREF Voltage vs Temperature vs Input Voltage
30 2.050 2.08 IREF = 100µA 2.06 25 NORMAL: INTVCC = 2.5V 2.025 2.04 20 2.02 (V) 15 (V) 2.000 2.00 FOLDBACK: INTVCC = 0V V REF V REF CURRENT LIMIT (mA) 1.98 10 CC 1.975 1.96 INTV 5 1.94 0 1.950 1.92 –50 0 50 100 150 –50 0 50 100 150 0 10 20 30 40 TEMPERATURE (°C) TEMPERATURE (°C) VIN (V) 3952A G10 3952A G11 3952A G12
Switching Frequency FB Thresholds vs Temperature Switching Frequency vs RT vs Temperature
1.24 10 1.050 OVFB RISING RT = 90.9k 1.22 OVFB FALLING 1.025 1.20 VFB 1.18 1 1.000 OPENLED RISING 1.16 FB THRESHOLDS (V) 0.975 OPENLED FALLING 1.14 SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 1.12 0.1 0.950 –50 0 50 100 150 10 100 1000 –50 0 50 100 150 TEMPERATURE (°C) RT (kΩ) TEMPERATURE (°C) 3952A G13 3952A G14 3952A G15
ISP/ISN Full-Scale Threshold ISP/ISN Mid-Scale Threshold SW Current Limit vs Temperature vs Temperature (CTRL = 0.7V) vs Temperature
5.0 254 128 CTRL = 2V VISP = 60V 253 127 4.8 252 126 4.6 251 250 125 4.4 ISP-ISN (mV) 249 ISP-ISN (mV) 124 SW CURRENT LIMIT (A) 248 4.2 123 247 4.0 246 122 –50 0 50 100 150 –55 0 50 100 150 –50 0 50 100 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3952A G16 3952A G17 3952A G18 Rev A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Revision History Typical Application Related Parts