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LTC3786 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3786 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 44 page  LT8710 4 8710f For more information www.linear.com/LT8710 PARAMETER CONDITIONS MIN TYP MAX UNITS Positive FBX Pin Bias Current VFBX = Positive FBX Reg Voltage, Current into Pin l 81.9 83.7 85.6 µA Negative FBX Pin Bias Current VFBX = Negative FBX Reg Voltage, Current Out of Pin l 81.1 83.1 85.2 µA FBX Amp Transconductance, EA1 or EA2 ΔI = 2μA 200 µmhos FBX Amp Voltage Gain, EA1 or EA2 70 V/V FBX Line Regulation 4.5V ≤ VIN ≤ 80V, VBIAS = 0V –0.02 –0.001 0.02 %/V Output Current Sense Regulation Voltage, VISP – VISN VISN = 80V, VFBX = 1V VISN = 12V, VFBX = 1V VISN = 0V, VFBX = 1V VISN = 12V, VFBX = 1V, INTVEE in UVLO and VSS > 1.8V l l l l 43 43 40 17 50 50 50 25 57 57 60 34 mV mV mV mV IMON Regulation Voltage, EA3 VFBX = 1V VFBX = 1V, INTVEE in UVLO and VSS > 1.8V l l 1.184 0.885 1.213 0.916 1.24 0.947 V V Output Current Sense Amp Transconductance, A6 ΔI = 10μA 1000 µmhos Output Current Sense Amp Voltage Gain, A6 11.9 V/V Output Current Sense Amp Input Dynamic Range, A6 Negative Input Range, VISP – VISN Positive Input Range, VISP – VISN 500 –51.8 mV mV IMON Amp Transconductance, EA3 ΔI = 2μA, VFBX = 1V 165 µmhos IMON Amp Voltage Gain, EA3 VFBX = 1V 65 V/V EN/FBIN Input Regulation Voltage, EA4 VFBX = 1V l 1.55 1.607 1.662 V EN/FBIN Amp Transconductance, EA4 ΔI = 2µA, VFBX = 1V 140 µmhos EN/FBIN Amp Voltage Gain, EA4 VFBX = 1V 55 V/V MODE Forced CCM Threshold To Exit Forced CCM Mode, MODE Rising To Enter Forced CCM Mode, MODE Falling l l 1.19 1.125 1.224 1.175 1.258 1.23 V V MODE Forced CCM Threshold Hysteresis 49 mV DCM Comparator Threshold in Pulse-Skipping Mode, MODE = 2V VISN = 80V, To Enter DCM Mode, VISP – VISN Falling VISN = 12V, To Enter DCM Mode, VISP – VISN Falling VISN = 0V, To Enter DCM Mode, VISP – VISN Falling l l l –4.5 –4.5 –7.5 2.8 2.8 2.8 10 10 13 mV mV mV DCM Comparator Threshold in Forced CCM, MODE =0V VISN = 80V, To Enter DCM Mode, VISP – VISN Falling VISN = 12V, To Enter DCM Mode, VISP – VISN Falling VISN = 0V, To Enter DCM Mode, VISP – VISN Falling l l l –220 –220 –220 –300 –300 –300 –380 –380 –380 mV mV mV Oscillator Switching Frequency, fOSC RT = 46.4k RT = 357k l l 640 85 750 100 860 115 kHz kHz Switching Frequency in Foldback Compared to Normal fOSC 1/5 ratio Switching Frequency Range Free-Running or Synchronizing l 100 750 kHz SYNC High Level for Sync l 1.5 V SYNC Low Level for Sync l 0.4 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 3V 20 80 % Recommended Min SYNC Ratio fSYNC/fOSC 3/4 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications for each channel are at TA = 25°C. VIN = 12V, VEN/FBIN = 12V, VBIAS = 12V, unless otherwise noted (Note 2). |
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