Datasheet LT3761A (Analog Devices) - 3

LT3761A
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Error Amplifier
Full-Scale ISP/ISN Current Sense Threshold CTRL ≥ 1.2V, ISP = 48V l 242 250 258 mV (VISP-ISN) CTRL ≥ 1.2V, ISN = 0V l 243 257 271 mV 1/10th Scale ISP/ISN Current Sense Threshold CTRL = 0.2V, ISP = 48V l 21 25 30 mV (VISP-ISN) CTRL = 0.2V, ISN = 0V l 17 28 39 mV Mid-Scale ISP/ISN Current Sense Threshold CTRL = 0.5V, ISP = 48V l 96 100 104 mV (VISP-ISN) CTRL = 0.5V, ISN = 0V l 95 105 115 mV ISP/ISN Overcurrent Threshold 600 mV ISP/ISN Current Sense Amplifier Input Common Mode 0 80 V Range (VISN) ISP/ISN Input Bias Current High Side Sensing (Combined) PWM = 5V (Active), ISP = ISN = 48V 100 µA PWM = 0V (Standby), ISP = ISN = 48V 0.1 µA ISP/ISN Input Bias Current Low Side Sensing (Combined) PWM = 5V, ISP = ISN = 0V –230 µA ISP/ISN Current Sense Amplifier gm (High Side Sensing) VISP-ISN = 250mV, ISP = 48V 120 µS ISP/ISN Current Sense Amplifier gm (Low Side Sensing) VISP-ISN = 250mV, ISN = 0V 70 µS CTRL Pin Range for Linear Current Sense Threshold l 0 1.0 V Adjustment CTRL Input Bias Current Current Out of Pin 50 100 nA VC Output Impedance 0.9V ≤ VC ≤ 1.5V 15 MΩ VC Standby Input Bias Current PWM = 0V –20 20 nA FB Regulation Voltage (VFB) ISP = ISN = 48V, 0V l 1.225 1.255 1.275 V FB Amplifier gm FB = VFB, ISP = ISN = 48V 500 µS FB Pin Input Bias Current Current Out of Pin, FB = VFB 40 100 nA FB Open LED Threshold OPENLED Falling, ISP Tied to ISN l VFB – VFB – VFB – V 65mV 50mV 40mV C/10 Inhibit for OPENLED Assertion (VISP-ISN) FB = VFB, ISN = 48V, 0V 14 25 39 mV FB Overvoltage Threshold PWMOUT Falling VFB + VFB + VFB + V 50mV 60mV 75mV VC Current Mode Gain (∆VVC/∆VSENSE) 4 V/V
Oscillator
Switching Frequency RT = 95.3kΩ l 85 100 115 kHz RT = 8.87kΩ 925 1000 1050 kHz GATE Minimum Off-Time CGATE = 2200pF 160 ns GATE Minimum On-Time CGATE = 2200pF 180 ns
Linear Regulator
INTVCC Regulation Voltage 10V ≤ VIN ≤ 60V l 7.6 7.85 8.05 V INTVCC Maximum Operating Voltage 8.1 V INTVCC Minimum Operating Voltage 4.5 V Dropout (VIN – INTVCC) IINTVCC = –10mA, VIN = 7V 390 mV INTVCC Undervoltage Lockout EN/UVLO = 2V l 3.9 4.1 4.4 V INTVCC Current Limit INTVCC = 6V, 8V ≤ VIN ≤ 60V 30 36 42 mA INTVCC Current in Shutdown EN/UVLO = 0V, INTVCC = 8V 8 13 µA 3761af For more information www.linear.com/LT3761A 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts