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LT3756 Datasheet(PDF) 4 Page - Analog Devices |
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LT3756 Datasheet(HTML) 4 Page - Analog Devices |
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4 / 26 page  LT3756/LT3756-1/LT3756-2 4 Rev. C For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Minimum Operating Voltage VIN Tied to INTVCC l 6 V VIN Shutdown IQ SHDN/UVLO = 0V, PWM = 0V SHDN/UVLO = 1.15V, PWM = 0V 0.1 1 5 µA µA VIN Operating IQ (Not Switching) PWM = 0V 1.4 1.7 mA VREF Voltage 100µA ≤ IVREF ≤ 0µA (E, I, H-Grades) 80µA ≤ IVREF ≤ 0µA (J-Grade only) l l 1.965 1.965 2.00 2.00 2.045 2.045 V V VREF Line Regulation 6V ≤ VIN ≤ 100V 0.006 %/V SENSE Current Limit Threshold l 98 108 118 mV SENSE Input Bias Current Current Out of Pin 40 µA SS Pull-Up Current Current Out of Pin 8 10 13 µA Error Amplifier ISP/ISN Full-Scale Current Sense Threshold FB = 0V, ISP = 48V J-Grade l l 96 95.5 100 100 103 103 mV mV ISP/ISN Current Sense Threshold at CTRL = 0V CTRL = 0V, FB = 0V, ISP = 48V –12 –9.5 –7 mV CTRL Pin Range for Current Sense Threshold Adjustment l 0 1.1 V CTRL Input Bias Current Current Out of Pin 50 100 nA LED Current Sense Amplifier Input Common Mode Range (VISN) l 2.9 100 V ISP/ISN Short-Circuit Threshold ISN = 0V 115 150 200 mV ISP/ISN Short-Circuit Fault Sensing Common Mode Range (VISN) l 0 3 V ISP/ISN Input Bias Current (Combined) PWM = 5V (Active), ISP = ISN = 48V PWM = 0V (Standby), ISP = ISN = 48V 55 0 0.1 µA µA LED Current Sense Amplifier gm V(ISP – ISN) = 100mV 120 µS VC Output Impedance 1V < VC < 2V 15000 kΩ VC Standby Input Bias Current PWM = 0V –20 20 nA FB Regulation Voltage (VFB) ISP = ISN J-Grade l l 1.220 1.232 1.215 1.250 1.250 1.250 1.270 1.265 1.275 V V V FB Amplifier gm FB = VFB, ISP = ISN 480 µS FB Pin Input Bias Current Current Out of Pin 40 100 nA FB Open LED Threshold OPENLED Falling (LT3756 and LT3756-2) VFB – 65mV VFB – 50mV VFB – 40mV V FB Overvoltage Threshold PWMOUT Falling VFB + 50mV VFB + 60mV VFB + 75mV V VC Current Mode Gain – (∆VVC/∆VSENSE) 4 V/V Oscillator Switching Frequency RT = 100k RT = 10k l 90 925 100 1000 125 1050 kHz kHz Minimum Off-Time 170 ns Linear Regulator INTVCC Regulation Voltage 7 7.15 7.3 V Dropout (VIN – INTVCC) IINTVCC = –10mA, VIN = 7V 1 V INTVCC Undervoltage Lockout 3.9 4.1 4.3 V |
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