Datasheet LT3753 (Analog Devices) - 8

LT3753
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. SS1 High, Active and Reset SS2 Soft-Start Charge Current Switching Frequency Levels vs Junction Temperature vs Junction Temperature vs SS1 Pin Voltage
3.00 25 350 R 2.75 T = 24.9k SS1 HIGH LEVEL 24 325 2.50 300 23 2.25 275 SS2 PIN CURRENT* (–1) 250 2.00 22 225 1.75 21 SS1 ACTIVE LEVEL 200 1.50 (ALLOW FORWARD CONVERTER SWITCHING) 20 175 1.25 T CHARGE CURRENT (µA) 19 150 1.00 AR 125 18 100 0.75 T-ST 17 SWITCHING FREQUENCY (kHz) 75 HIGH, ACTIVE AND RESET LEVELS (V) 0.50 SOF SS1 RESET LEVEL (RESET SS1 LATCH) 50 SS1 0.25 SS2 16 25 0 15 0 –75 –50 –25 0 25 50 75 100 125 150 175 –75 –50 –25 0 25 50 75 100 125 150 175 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) SS1 (V) 3753 G10 3753 G11 3753 G12
Switching Frequency FB Reference Voltage ISENSEP Maximum Threshold vs Junction Temperature vs Junction Temperature vs COMP
325 1.30 240 RT = 24.9k 320 1.29 220 315 1.28 200 180 310 1.27 160 305 TAGE (V) 1.26 140 300 1.25 120 295 1.24 THRESHOLD (mV) 100 OC THRESHOLD 290 1.23 80 I SENSEP 60 SWITCHING FREQUENCY (kHz) 285 FB REFERENCE VOL 1.22 40 280 1.21 20 275 1.20 0 –75 –50 –25 0 25 50 75 100 125 150 175 –75 –50 –25 0 25 50 75 100 125 150 175 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) COMP (V) 3753 G13 3753 G14 3753 G15
ISENSEP Maximum Threshold – VSLP OC Overcurrent vs Duty Cycle (Programming Slope (Hiccup Mode) Threshold Compensation) vs Junction Temperature
240 110 VSLP = I(ISENSEP) • RISLP 220 105 RISLP = 0Ω 100 200 RISLP = 1.5kΩ 95 180 90 RISLP = 2kΩ MAXIMUM THRESHOLD - VSLOPE (V) 160 P 85 OC OVERCURRENT THRESHOLD (mV) I SENSE 140 80 0 10 20 30 40 50 60 70 80 90 100 –75 –50 –25 0 25 50 75 100 125 150 175 DUTY CYCLE (%) JUNCTION TEMPERATURE (°C) 3753 G16 3753 G17 Rev. B 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Package Description Revision History Typical Application Related Parts