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LT1248 Datasheet(PDF) 3 Page - Linear Technology |
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LT1248 Datasheet(HTML) 3 Page - Linear Technology |
3 / 12 page 3 LT1248 IM IAC (VAOUT – 2) 2 Note 2: Multiplier Gain Constant: K = ELECTRICAL C C HARA TERISTICS The q denotes specifications which apply over the full operating tempera- ture range, otherwise specifications are at TA = 25°C. Maximum operating voltage (VMAX) = 25V, VCC = 18V, RSET = 15k to GND, CSET = 1nF to GND, IAC = 100µA, ISENSE = 0V, CAOUT = 3.5V, VAOUT = 5V, OVP = 7.5V, no load on any outputs, unless otherwise noted. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired PARAMETER CONDITIONS MIN TYP MAX UNITS Current Amplifier Current Amp Short-Circuit Current CAOUT = 0V q 514 30 mA Input Range, ISENSE, MOUT (Linear Operation) q – 0.3 1 V Reference Reference Output Voltage IREF = 0mA, TA = 25°C 7.39 7.50 7.60 V VREF Load Regulation – 5mA < IREF < 0mA 5 mV VREF Line Regulation 11.5V < VCC < VMAX q –20 5 20 mV VREF Short-Circuit Current VREF = 0V q 12 28 50 mA VREF Worst Case Load, Line, Temperature q 7.32 7.5 7.68 V Current Limit PKLIM Offset Voltage q –15 15 mV PKLIM Input Current PKLIM = – 0.1V q – 50 – 100 µA PKLIM to GTDR Propagation Delay PKLIM Falling from 50mV to – 50mV 400 ns Multiplier Multiplier Output Current IAC = 100µA, RSET = 15k 35 µA Multiplier Output Current Offset RAC = 1M from IAC to GND q – 0.05 – 0.5 µA Multiplier Maximum Output Current IAC = 450µA, RSET = 15k, VAOUT = 7V, MOUT = 0V q – 286 – 260 – 235 µA Multiplier Gain Constant (Note 2) 0.035 V–2 IAC Input Resistance IAC from 50µA to 1mA 15 32 50 k Ω Oscillator Oscillator Frequency RSET = 15k, CSET = 1000pF q 85 100 115 kHz RSET = 15k, CSET = 1500pF q 58 68 78 kHz CSET Ramp Peak-to-Peak Amplitude 4.35 4.7 5.0 V CSET Ramp Valley Voltage 1.25 1.4 1.55 V Synchronization Pulse Threshold on EN/SYNC Pin Pulse Low = 3.5V, High = 7V, Width > 200ns 4.5 5.6 6.5 V Synchronization Frequency Range RSET = 15k, CSET = 1000pF q 1.2 1.6 f NOM Overvoltage Comparator Comparator Trip Voltage Ratio (VTRIP/VREF) q 1.04 1.05 1.06 Hysteresis 0.35 V OVP Bias Current OVP = 7.5V q – 50 – 250 nA OVP Propagation Delay 100 ns Gate Driver Max GTDR Output Voltage 0mA Load, 18V < VCC q 12 15 17.5 V GTDR Output High – 200mA Load, 11.5V ≤ VCC ≤ 15V q VCC – 3.0 V GTDR Output Low (Device Unpowered) VCC = 0V, 50mA Load (Sinking) q 0.9 1.5 V GTDR Output Low (Device Active) 200mA Load (Sinking) q 0.5 1 V 10mA Load q 0.2 0.4 V Peak GTDR Current 10nF from GTDR to GND 2 A GTDR Rise and Fall Time 1nF from GTDR to GND 25 ns GTDR Max Duty Cycle 90 96 % |
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