Datasheet LT3932, LT3932-1 (Analog Devices) - 4

LT3932/LT3932-1
ELECTRICAL CHARACTERISTICS 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. 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 0.965 1.000 1.030 V VISP − VISN = 10mV (10%), VISP = 12V 80 100 120 mV
PWM Driver
PWMTG Gate Drive (VOUT – VPWMTG) VOUT = 12V, VPWM = 2V l 10 11 V PWM Threshold (Rising) VOUT = 12V, VRP = 0V 1.4 V PWM Falling Hysteresis VOUT = 12V, VRP = 0V 200 mV PWM Pin Current VPWM = 2V −100 100 nA PWM to PWMTG Propagation Delay CPWMTG = 2.2nF (Connected from VOUT to PWMTG), Turn-On VOUT = 12V 100 ns Turn-Off 100 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 l 7.8 10 12.4 % RP = 28.7k, VREF = 2V, VPWM = 1.9V l 87 90 93 % PWM Dimming Frequency RP = 28.7k, RT = 45.3k, VSYNC/SPRD = 0V 7.42 7.81 8.20 kHz RP = 332k, RT = 45.3k, VSYNC/SPRD = 0V 116 122 128 Hz RP Pin Current Limit VRP = 0V, Current Out of Pin 60 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
This IC includes overtemperature protection that is intended to may cause permanent damage to the device. Exposure to any Absolute protect the device during momentary overload conditions. The maximum Maximum Rating condition for extended periods may affect device rated junction temperature will be exceeded when this protection is active. reliability and lifetime. Continuous operation above the specified absolute maximum operating
Note 2:
Do not apply a positive or negative voltage source to these pins, junction temperature may impair device reliability or permanently damage otherwise permanent damage may occur. the device.
Note 3:
The LT3932E is guaranteed to meet performance specifications
Note 5:
The current sense error amplifier is tested with VISP = 36V, and from 0°C to 125°C junction temperature. Specifications over the −40°C separately, with VISN = 0V. to 125°C operating junction temperature range are assured by design,
Note 6:
The MIN on and off times are guaranteed by design and are not characterization and correlation with statistical process controls. The tested. 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. Rev B 4 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