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LT3955 Datasheet(PDF) 3 Page - Linear Technology |
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LT3955 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 30 page  LT3955 3 3955fb For more information www.linear.com/LT3955 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. elecTrical characTerisTics PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Minimum Operating Voltage VIN Tied to INTVCC l 4.5 V VIN Shutdown IQ EN/UVLO = 0V, PWM = 0V EN/UVLO = 1.15V, PWM = 0V 0.1 1 6 µA µA VIN Operating IQ (Not Switching) PWM = 0V 1.7 2.2 mA VREF Voltage –100µA ≤ IVREF ≤ 0µA l 1.965 2.02 2.06 V VREF Line Regulation 4.5V ≤ VIN ≤ 60V 0.001 %/V VREF Pull-Up Current VREF = 0V l 150 185 210 µA SW Pin Current Limit l 3.5 4.2 4.9 A SW Pin Leakage SW = 48V 5 10 µA SW Pin Voltage Drop ISW = 2A 200 mV DIM/SS Pull-Up Current Current Out of Pin, DIM/SS = 0V l 10 12 14 µA DIM/SS Voltage Clamp IDIM/SS = 0µA 1.2 V Error Amplifier Full-Scale ISP/ISN Current Sense Threshold (VISP–ISN) CTRL ≥ 1.2V, ISP = 48V, 0V ≤ FB ≤ 1.18V CTRL ≥ 1.2V, ISN = 0V, 0V ≤ FB ≤ 1.18V l l 242 243 250 257 258 268 mV mV 1/10th Scale ISP/ISN Current Sense Threshold (VISP–ISN) CTRL = 0.2V, ISP = 48V, 0V ≤ FB ≤ 1.18V CTRL = 0.2V, ISN = 0V, 0V ≤ FB ≤ 1.18V l l 21 20 25 28 30 36 mV mV Mid-Scale ISP/ISN Current Sense Threshold (VISP–ISN) CTRL = 0.5V, ISP = 48V, 0V ≤ FB ≤ 1.18V CTRL = 0.5V, ISN = 0V, 0V ≤ FB ≤ 1.18V l l 96 94 100 105 104 115 mV mV ISP/ISN Overcurrent Threshold 600 mV ISP/ISN Current Sense Amplifier Input Common Mode Range (VISN) 0 80 V ISP/ISN Input Bias Current High Side Sensing (Combined) PWM = 5V (Active), ISP = ISN = 48V PWM = 0V (Standby), ISP = ISN = 48V 100 0.1 µA 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 Adjustment l 0 1.0 V 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 VMODE Falling, ISP Tied to ISN l VFB – 65mV VFB – 50mV VFB – 40mV V C/10 Inhibit for VMODE Assertion (VISP–ISN) FB = VFB, ISN = 48V, 0V 14 25 39 mV FB Overvoltage Threshold PWMOUT Falling VFB + 50mV VFB + 60mV VFB + 70mV V Oscillator Switching Frequency RT = 95.3kΩ RT = 8.87kΩ l 85 925 100 1000 115 1050 kHz kHz SW Minimum Off-Time 160 ns SW Minimum On-Time 180 ns SYNC Input Low 0.4 V |
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