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UCC1837 Datasheet(PDF) 2 Page - Texas Instruments |
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UCC1837 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page 2 UCC1837 UCC2837 UCC3837 CONNECTION DIAGRAM ELECTRICAL CHARACTERISTICS: Unless otherwise specified, TA = –55°C to 125°C for the UCC1837, –25°C to 85°C for the UCC2837 and 0°C to 70°C for UCC3837; VDD = 5V, CT = 10nF, CCAP = 100nF. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Supply Supply Current VDD = 5V 1 1.5 mA VDD = 10V 1.2 2 mA Under Voltage Lockout Minimum Voltage to Start 2.00 2.65 3.00 V Minimum Voltage After Start 1.6 2.2 2.6 V Hysteresis 0.25 0.45 0.65 V Reference ( Note 1 ) VREF 25°C 1.485 1.5 1.515 V 0°C to 70°C 1.470 1.5 1.530 V –55°C to 125°C 1.455 1.5 1.545 V Current Sense Comparator Offset 0°C to 70°C 90 100 110 mV Comparator Offset –55°C to 125°C 85 100 115 mV Amplifier Offset 120 140 160 mV Input Bias Current VCS = 5V 0.5 5 µA Current Fault Timer CT Charge Current VCT = 1V 16 36 56 µA CT Discharge Current VCT = 1V 0.4 1.2 1.9 µA CT Fault Low Threshold 0.4 0.5 0.6 V CT Fault Hi Threshold 1.3 1.5 1.7 V Fault Duty Cycle 2 3.3 5 % Error Amplifier Input Bias Current 0.5 2 µA Open Loop Gain 60 90 dB Transconductance –10 µA to 10µA 2 5 8 mMho Charge Current VCOMP = 6V 20 40 60 µA Discharge Current VCOMP = 6V 10 25 40 µA DIL-8, SOIC-8 (Top View) J or N Package, D Package ABSOLUTE MAXIMUM RATINGS All pins referenced to GND . . . . . . . . . . . . . . . . . –0.3V to +15V CS, CT, FB . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VDD + 0.3V Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . –55°C to +150°C Lead Temperature (Soldering, 10sec.) . . . . . . . . . . . . . +300°C Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. |
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