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LT3932 Datenblatt(PDF) 4 Page - Linear Technology |
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LT3932 Datenblatt(HTML) 4 Page - Linear Technology |
4 / 30 page LT3932/LT3932-1 4 3932fa For more information www.linear.com/LT3932 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Do not apply a positive or negative voltage source to these pins, otherwise permanent damage may occur. Note 3: The LT3932E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the −40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3932I is guaranteed to meet performance specifications over the −40°C to 125°C operating junction temperature range. The LT3932H is guaranteed over the −40°C to 150°C operating junction temperature range. Operating lifetime is derated for junction temperatures greater than 125°C. Note 4: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. The maximum rated junction temperature will be exceeded when this protection is active. Continuous operation above the specified absolute maximum operating junction temperature may impair device reliability or permanently damage the device. Note 5: The current sense error amplifier is tested with VISP = 36V, and separately, with VISN = 0V. Note 6: The MIN on and off times are guaranteed by design and are not tested. ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS SS Pin Discharging Current VSS = 2V 1.25 µA SS Lower Threshold (Falling) 200 mV SS Higher Threshold (Rising) 1.7 V Fault Detection Open-Circuit Threshold (FB Rising) l 930 950 970 mV Open-Circuit Falling Hysteresis 55 mV Short-Circuit Threshold (FB Falling) l 180 200 220 mV Short-Circuit Rising Hysteresis 50 mV FAULT Pull-Down Current VFAULT = 200mV, VFB = 0V 100 µA FAULT Leakage Current VFAULT = 3.3V, VFB = 700mV −100 100 nA Overvoltage Protection FB Overvoltage Threshold (FB Rising) 1.050 V FB Overvoltage Falling Hysteresis 48 mV LED Current Monitor ISMON Voltage VISP − VISN = 100mV (100%), VISP = 12V VISP − VISN = 10mV (10%), VISP = 12V 0.965 80 1.000 100 1.030 120 V mV PWM Driver PWMTG Gate Drive (VOUT – VPWMTG) VOUT = 12V, VPWM = 2V l 10 11 V PWM Threshold (Rising) VOUT = 12V 1.4 V PWM Falling Hysteresis VOUT = 12V 200 mV PWM Pin Current VPWM = 2V −100 100 nA PWM to PWMTG Propagation Delay Turn-On Turn-Off CPWMTG = 2.2nF (Connected from VOUT to PWMTG), VOUT = 12V 100 100 ns ns Analog Control for PWM Dimming PWM Voltage for 100% Dimming RP = 28.7k, VREF = 2V 2.00 V PWM Voltage for 0% Dimming RP = 28.7k, VREF = 2V 0.99 V PWM Dimming Accuracy RP = 28.7k, VREF = 2V, VPWM = 1.1V RP = 28.7k, VREF = 2V, VPWM = 1.9V l l 7.8 87 10 90 12.4 93 % % PWM Dimming Frequency RP = 28.7k, RT = 45.3k, VSYNC/SPRD = 0V RP = 332k, RT = 45.3k, VSYNC/SPRD = 0V 7.42 116 7.81 122 8.20 128 kHz Hz RP Pin Current Limit RP = 0V, Current Out of Pin 60 µA The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V unless otherwise noted. |
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Ähnliche Beschreibung - LT3932 |
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