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LT3952 Datasheet(PDF) 3 Page - Linear Technology |
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LT3952 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LT3952 3 3952fb For more information www.linear.com/LT3952 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = IVINP = IVINN = 12V, ISP = ISN = 24V, EN/UVLO = PWM = 3V, CTRL = 2V, OVLO = 0V unless otherwise noted PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Operating Voltage 3 V Supply Current FB = 1.3V, RT = 40.2k, CTRL = 0V EN/UVLO = 0V, CTRL = 0V EN/UVLO = 1.15V, CTRL = 0V 1.5 0 35 2.2 1 60 mA µA µA Internal Regulator INTVCC Output Voltage CTRL = 0V 2.90 3.00 3.10 V INTVCC Dropout Voltage VIN = 3V, CTRL = 0V 150 mV INTVCC Undervoltage Lockout INTVCC Rising, CTRL = 0V 2.62 2.68 2.74 V INTVCC UVLO Hysteresis CTRL = 0V 200 mV Reference Voltage Output VREF Voltage IVREF = –100A , CTRL = 0V l 1.955 2.000 2.045 V VREF Line Regulation 3V < VIN < 42V , CTRL = 0V 0.01 %/V VREF Load Regulation 0µA < IVREF < –100µA , CTRL = 0V 0.6 % Current Feedback CTRL Range for Current Sense Threshold Adjustment 0.2 1.2 V CTRL PWM Shutdown Threshold CTRL Falling 100 125 mV CTRL PWM Threshold Hysteresis 12.5 mV CTRL Zero-Scale Offset 200 mV CTRL Input Bias Current CTRL = 0V, Current Out of Pin 20 100 nA Current Sense Common Mode Input Range CTRL = 1.5V 0 60 V Full-Scale Current Sense Accuracy (VISP-VISN) ISP = 60V, CTRL = 1.5V l 245 250 255 mV Midrange Current Sense Accuracy (VISP-VISN) ISP = 60V, CTRL = 0.7V 115 125 135 mV 1/10th Scale Current Sense Accuracy (VISP-VISN) ISP = 60V, CTRL = 0.3V 10 25 40 mV Low Side Current Sense Accuracy (VISP-VISN) ISP = 0V, CTRL = 1.5V l 240 250 260 mV Overcurrent Sense Threshold l 350 375 390 mV ISP to VC Transconductance CTRL = 1.5V 275 µS ISP/ISN Input Bias Current PWM = 5V (Active), ISP = 60V PWM = 0V (Standby), ISP = 60V 250 0 0.1 µA µA Current Sense Monitor Ratio (VISMON)/(VISP-VISN) CTRL = 0.4V, 0.8V 4 V/V Current Sense Monitor Accuracy (VISMON) CTRL = 1.5V , ISP = 60V 0.950 1.000 1.050 V Input Current Sense Amplifier Amplifier Supply Current (From IVINP) IVINP = IVINN = 42V 35 60 µA IVIN Regulation Threshold (VIVINP-IVINN) l 55 60 65 mV IVINCOMP to VC Transconductance 1650 µS Input Common Mode Minimum Voltage 3 V IVINP/IVINN to Monitor Voltage Gain VIVINP-IVINN = 30mV 20 V/V |
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