Datasheet LT3517 (Analog Devices) - 4

LT3517
electrical characteristics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 5V, SHDN = 5V, PWM = 5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
TGEN Input High Voltage 1.5 V TGEN Input Low Voltage 0.4 V TGEN Pin Bias Current TGEN = 5V 100 200 µA VREF Pin Voltage IREF = –100µA l 1.96 2 2.04 V VREF Pin Voltage Line Regulation 3V < VIN < 40V 0.03 %/V Gate Turn-On Delay CLOAD = 1nF Between ISP and TG 200 ns Gate Turn-Off Delay CLOAD = 1nF Between ISP and TG 200 ns Top Gate Drive VGS (VISP – VTG) VISP = 24V, TGEN = 5V 7 V PWM = 0V 0 0.3 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Absolute maximum voltage at VIN, SHDN, PWM and TGEN pins may cause permanent damage to the device. Exposure to any Absolute is 40V for nonrepetitive 1 second transients and 30V for continuous Maximum Rating condition for extended periods may affect device operation. reliability and lifetime.
Note 4:
This IC includes overtemperature protection that is intended
Note 2:
The LT3517E is guaranteed to meet performance specifications to protect the device during momentary overload conditions. Junction from 0°C to 125°C operating junction temperature range. Specifications temperature will exceed the maximum operating junction temperature over the –40°C to 125°C operating junction temperature range are when overtemperature protection is active. Continuous operation above assured by design, characterization and correlation with statistical the specified maximum operating junction temperature may impair device process controls. The LT3517I is guaranteed over the full –40°C to 125°C reliability. operating junction temperature range. The LT3517H is guaranteed over the full –40°C to 150°C operating junction temperature range. Operating lifetime is derated at junction temperatures greater than 125°C.
typical perForMance characteristics Switch Current Limit VISP – VISN Threshold vs VCTRL vs Duty Cycle Oscillator Frequency vs RT
120 2.0 10000 VIN = 5V TA = 25°C VISP = 24V 100 VC = 1V TA = 25°C 1.5 80 60 1.0 1000 THRESHOLD (mV) ISN 40 – V 0.5 V ISP SWITCH CURRENT LIMIT (A) 20 OSCILLATOR FREQUENCY (kHz) TA = 25°C 0 0 100 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 20 40 60 80 100 1 10 100 VCTRL (V) DUTY CYCLE (%) RT (kΩ) 3518 G01 3518 G03 3517 G02 3517fh 4 For more information www.linear.com/LT3517 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts