Datasheet LT8714 (Analog Devices) - 4

LT8714
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 = 12V, VBIAS = 12V, unless otherwise noted (Note 2). PARAMETER CONDITIONS MIN TYP MAX UNITS
FB Internal Voltage, V1 IFB = 0.0μA l 0.597 0.6065 0.616 V FB Internal Resistance, R1 l 7.1 7.25 7.4 kΩ FB Amp Transconductance, EA1 ∆IVC = 2μA 200 μmhos FB Amp Voltage Gain, EA1 108 V/V FB Line Regulation 4.5V ≤ VIN ≤ 80V –0.02 –0.001 0.02 %/V Output Current Sense Regulation Voltage, VISN = 80V, VFB = 1.4V, CTRL = 1.1V l 46 50 54 mV VISP – VISN VISN = 5V, VFB = 1.4V, CTRL = 1.1V l 46 50 54 mV IMON Regulation Voltage, EA2 VFB = 1V l 1.184 1.208 1.233 V Output Current Sense Amp Transconductance, A7 ∆IIMON = 10μA 1000 μmhos Output Current Sense Amp Voltage Gain, A7 12.14 V/V Output Current Sense Amp Input Dynamic Negative Input Range l –55.5 –49.5 –43.5 mV Range, A7 Positive Input Range 500 mV IMON Amp Transconductance, EA2 ∆IVC =2μA, VFB = 1.4V, CTRL=1.1V 160 μmhos IMON Amp Voltage Gain, EA2 VISN = 12V, VFB = 1.4V, CTRL = 1.1V 70 V/V Valley Inductor Current Limit, VISP – VISN VISN = 80V l –220 –300 –380 mV VISN = 12V l –220 –300 –380 mV
Oscillator
Switching Frequency, fOSC RT = 46.4k l 640 750 860 kHz RT = 357k l 85 100 115 kHz 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
Gate Drivers, BG and TG
BG Rise Time CBG = 3300pF (Note 3) 24 ns BG Fall Time CBG = 3300pF (Note 3) 21 ns TG Rise Time CTG = 3300pF (Note 3) 15 ns TG Fall Time CTG = 3300pF (Note 3) 16 ns BG and TG Non-Overlap Time TG Rising to BG Rising, CBG = CTG = 3300pF 80 140 220 ns (Note 3) BG Falling to TG Falling, CBG = CTG = 3300pF 45 90 150 ns (Note 3) BG Minimum On-Time CBG = CTG = 3300pF 150 420 ns BG Minimum Off-Time CBG = CTG = 3300pF 100 480 ns TG Minimum On-Time CBG = CTG = 3300pF 0 150 ns TG Minimum Off-Time CBG = CTG = 3300pF 290 770 ns 8714f 4 For more information www.linear.com/LT8714 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Appendix Typical Applications Package Description Typical Application Related Parts