Datasheet LT8311 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters |
| Pages / Page | 48 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 744 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Opto-Driver Short-Circuit Current
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LT8311
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Opto-Driver Short-Circuit Current Opto-Driver Sink Current INTVCC Regulation Voltage
20 400 8 7 350 15 6 TAGE (V) 300 VOL 5 TO CURRENT (mA) V CC 10 TO CURRENT (µA) OP OP INT 250 4 5 200 3 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8311 G18 8311 G19 8311 G20
INTVCC Current Limit and INTVCC UVLO INTVCC OVLO Short-Circuit Current
4.8 16.5 60 UVLO+ 50 INTV 4.6 16.0 OVLO+ CC CURRENT LIMIT 40 TAGE (V) TAGE (V) 4.4 15.5 VOL VOL CURRENT (mA) V CC UVLO– V CC 30 V CC INT INT 4.2 15.0 OVLO– INT INTV 20 CC SHORT-CIRCUIT CURRENT 4.0 14.5 10 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8311 G21 8311 G22 8311 G23
CG/FG Rise/Fall Time CSW/FSW Maximum Input CG/FG Rise/Fall Time vs INTVCC Voltage Current
30 25.0 260 INTVCC ≈ 7V (NOT OVERDRIVEN) FG FALL TIME VCSW = VFSW = 150V FG RISE TIME CG FALL TIME 25 22.5 CG RISE TIME 250 20 20.0 240 ALL TIME (ns) ALL TIME (ns) RISE/F RISE/F 15 FG FALL TIME 17.5 230 FG RISE TIME CG FALL TIME CG RISE TIME CSW/FSW MAXIMUM INPUT CURRENT (µA) 10 15.0 220 –75 –50 –25 0 25 50 75 100 125 150 6 8 10 12 14 16 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) INTV TEMPERATURE (°C) 8311 G24 CC (V) 8311 G25 8311 G26 8311f For more information www.linear.com/LT8311 9 Document Outline Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation FUNDAMENTALS OF FORWARD CONVERTER OPERATION IN CCM LT8311 SYNCHRONOUS CONTROL SCHEMES PREACTIVE MODE SYNCHRONOUS CONTROL SYNC MODE SYNCHRONOUS CONTROL OPTO-COUPLER CONTROL Applications Information VIN BIAS SUPPLY INTVCC BIAS SUPPLY LT8311 OPTO CONTROL FUNDAMENTALS LT8311 SYNCHRONOUS CONTROL FUNDAMENTALS PREACTIVE MODE SYNCHRONOUS CONTROL SYNC MODE SYNCHRONOUS CONTROL Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Opto-Driver Short-Circuit Current Opto-Driver Sink Current INTVCC Regulation Voltage
20 400 8 7 350 15 6 TAGE (V) 300 VOL 5 TO CURRENT (mA) V CC 10 TO CURRENT (µA) OP OP INT 250 4 5 200 3 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8311 G18 8311 G19 8311 G20
INTVCC Current Limit and INTVCC UVLO INTVCC OVLO Short-Circuit Current
4.8 16.5 60 UVLO+ 50 INTV 4.6 16.0 OVLO+ CC CURRENT LIMIT 40 TAGE (V) TAGE (V) 4.4 15.5 VOL VOL CURRENT (mA) V CC UVLO– V CC 30 V CC INT INT 4.2 15.0 OVLO– INT INTV 20 CC SHORT-CIRCUIT CURRENT 4.0 14.5 10 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8311 G21 8311 G22 8311 G23
CG/FG Rise/Fall Time CSW/FSW Maximum Input CG/FG Rise/Fall Time vs INTVCC Voltage Current
30 25.0 260 INTVCC ≈ 7V (NOT OVERDRIVEN) FG FALL TIME VCSW = VFSW = 150V FG RISE TIME CG FALL TIME 25 22.5 CG RISE TIME 250 20 20.0 240 ALL TIME (ns) ALL TIME (ns) RISE/F RISE/F 15 FG FALL TIME 17.5 230 FG RISE TIME CG FALL TIME CG RISE TIME CSW/FSW MAXIMUM INPUT CURRENT (µA) 10 15.0 220 –75 –50 –25 0 25 50 75 100 125 150 6 8 10 12 14 16 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) INTV TEMPERATURE (°C) 8311 G24 CC (V) 8311 G25 8311 G26 8311f For more information www.linear.com/LT8311 9 Document Outline Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation FUNDAMENTALS OF FORWARD CONVERTER OPERATION IN CCM LT8311 SYNCHRONOUS CONTROL SCHEMES PREACTIVE MODE SYNCHRONOUS CONTROL SYNC MODE SYNCHRONOUS CONTROL OPTO-COUPLER CONTROL Applications Information VIN BIAS SUPPLY INTVCC BIAS SUPPLY LT8311 OPTO CONTROL FUNDAMENTALS LT8311 SYNCHRONOUS CONTROL FUNDAMENTALS PREACTIVE MODE SYNCHRONOUS CONTROL SYNC MODE SYNCHRONOUS CONTROL Typical Applications Package Description Typical Application Related Parts
