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LT3956 Datasheet(PDF) 3 Page - Linear Technology |
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LT3956 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 20 page  LT3956 3956f elecTrical characTerisTics The l denotes the specifications which apply over the full operating temp- erature 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 SW Pin Leakage SW = 48V 5 10 µA SW Pin Current Limit l 3.3 3.9 4.6 A SW Pin Voltage Drop I(SW) = 2A 220 mV SS Pull-Up Current Current Out of Pin 8 10 13 µA Error Amplifier Full-Scale Current Sense Threshold ( V(ISP–ISN)) FB = 0V, ISP = 48V, CTRL ≥ 1.2V l 240 250 257 mV Current Sense Threshold at CTRL = 1V ( V(ISP–ISN)) CTRL = 1V, FB = 0V, ISP = 48V l 217 225 231 mV Current Sense Threshold at CTRL = 0.5V ( V(ISP–ISN)) CTRL = 0.5V l 96 100 103 mV Current Sense Threshold at CTRL = 0.1V ( V(ISP–ISN)) CTRL = 0.1V, FB = 0V, ISP = 48V l –2.5 0 4.5 mV CTRL Range for Current Sense Threshold Adjustment 0 1.1 V CTRL Input Bias Current Current Out of Pin, CTRL = 0V 50 100 nA Current Sense Amplifier Input Common Mode Range ( VISN) 2.9 80 V ISP/ISN Short-Circuit Threshold ( V(ISP–ISN)) ISN = 0V 300 335 370 mV ISP/ISN Short-Circuit Fault Sensing Common Mode Range ( VISN) 0 3 V ISP/ISN Input Bias Current (Combined) PWM = 5V (Active), ISP = ISN = 48V PWM = 0V (Standby), ISP = ISN = 48V 80 0 0.1 µA µA LED Current Sense Amplifier gm 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 = 0V, 48V l 1.220 1.232 1.250 1.250 1.270 1.265 V V FB Amplifier gm FB = VFB, ISP = ISN 480 µS FB Pin Input Bias Current Current Out of Pin, FB = 1V 40 100 nA FB Voltage Loop Active Threshold VMODE Falling VFB – 65mV VFB – 50mV VFB – 40mV V FB Overvoltage Threshold PWMOUT Falling VFB + 50mV VFB + 60mV VFB + 80mV V Oscillator Switching Frequency RT = 100k RT = 10k l 90 925 100 1000 125 1050 kHz kHz SW Minimum Off-Time 170 ns SW Minimum On-Time 200 ns Linear Regulator INTVCC Regulation Voltage 7 7.15 7.3 V Dropout (VIN – INTVCC) IINTVCC = –10mA, VIN = 7V 1 V INTVCC Undervoltage Lockout l 4.1 4.4 V INTVCC Current Limit 14 17 25 mA INTVCC Current in Shutdown EN/UVLO = 0V, INTVCC = 7V 8 12 µA |
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