Datasheet LTC1698 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | Isolated Secondary Synchronous Rectifier Controller |
| Pages / Page | 24 / 6 — TYPICAL PERFOR A CE CHARACTERISTICS. SYNC Positive Threshold. IVDD vs … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. SYNC Positive Threshold. IVDD vs SYNC Frequency. vs Temperature. vs VDD
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LTC1698
W U TYPICAL PERFOR A CE CHARACTERISTICS SYNC Positive Threshold SYNC Positive Threshold IVDD vs SYNC Frequency vs Temperature vs VDD
50 2.25 2.20 V T DD = 8V VDD = 8V A = 25°C 45 TA = 25°C CFG = CCG = 4700pF 40 2.00 1.96 CFG = CCG = 3300pF 35 CFG = CCG = 2200pF 30 1.75 1.72 (mA) 25 I VDD 20 1.50 1.48 15 10 1.25 1.24 SYNC POSITIVE THRESHOLD (V) C SYNC POSITIVE THRESHOLD (V) FG = CCG = 1000pF 5 0 1.00 1.00 50 100 150 200 250 300 350 400 450 500 –50 –25 0 25 50 75 100 125 150 5 6 7 8 9 10 11 12 13 14 f V SYNC (kHz) TEMPERATURE (°C) DD (V) 1698 G19 1698 G20 1698 G21
Opto Driver Short-Circuit Current Undervoltage Lockout Threshold vs V I vs Temperature DD VDD vs VDD
0 20 5 TA = 25°C TA = 25°C VOPTODRV = 1.233V 18 fSYNC = 100kHz CFG = CCG = 4700pF –10 16 4 CFG = CCG = 3300pF 14 –20 12 3 (V) (mA) 10 UVLO I VDD V 8 2 –30 6 CFG = CCG = 2200pF 4 1 –40 CFG = CCG = 1000pF 2 OPTO DRIVER SHORT-CIRCUIT CURRENT (mA) –50 0 0 5 6 7 8 9 10 11 12 13 14 5 6 7 8 9 10 11 12 13 14 –50 –25 0 25 50 75 100 125 150 V V TEMPERATURE ( DD (V) DD (V) °C) 1698 G17 1698 G18 1698 G24
Driver Rise, Fall and Propagation SYNC Input to Driver Output Delay Driver Disable Time-Out vs SYNC Delay vs Driver Load vs Temperature Frequency
90 90 30 2.2 V NORMALIZED DRIVER DISABLE TIME-OUT DD = 8V VDD = 8V VDD = 8V 80 TA = 25°C 80 CCG = CFG = 1000pF TA = 25°C f µs) SYNC = 100kHz ( 25 2.0 70 CG, FG t 70 PLH DISS 60 60 t 20 DISS × fSYNC 1.8 tDISS CG, FG tPLH 50 50 t × f tr (ns) 15 f 1.6 SYNC 40 CG, FG t t d 40 CG, FG tPHL TIME (ns) PHL 30 30 10 1.4 20 20 tDISS 5 1.2 10 10 DRIVER DISABLE TIME-OUT t 0 0 0 1.0 0 2000 4000 6000 8000 10000 –50 –25 0 25 50 75 100 125 150 50 100 150 200 250 300 350 400 450 500 DRIVER LOAD (pF) TEMPERATURE (°C) fSYNC (kHz) 1698 G25 1698 G26 1698 G27 1698f 6
W U TYPICAL PERFOR A CE CHARACTERISTICS SYNC Positive Threshold SYNC Positive Threshold IVDD vs SYNC Frequency vs Temperature vs VDD
50 2.25 2.20 V T DD = 8V VDD = 8V A = 25°C 45 TA = 25°C CFG = CCG = 4700pF 40 2.00 1.96 CFG = CCG = 3300pF 35 CFG = CCG = 2200pF 30 1.75 1.72 (mA) 25 I VDD 20 1.50 1.48 15 10 1.25 1.24 SYNC POSITIVE THRESHOLD (V) C SYNC POSITIVE THRESHOLD (V) FG = CCG = 1000pF 5 0 1.00 1.00 50 100 150 200 250 300 350 400 450 500 –50 –25 0 25 50 75 100 125 150 5 6 7 8 9 10 11 12 13 14 f V SYNC (kHz) TEMPERATURE (°C) DD (V) 1698 G19 1698 G20 1698 G21
Opto Driver Short-Circuit Current Undervoltage Lockout Threshold vs V I vs Temperature DD VDD vs VDD
0 20 5 TA = 25°C TA = 25°C VOPTODRV = 1.233V 18 fSYNC = 100kHz CFG = CCG = 4700pF –10 16 4 CFG = CCG = 3300pF 14 –20 12 3 (V) (mA) 10 UVLO I VDD V 8 2 –30 6 CFG = CCG = 2200pF 4 1 –40 CFG = CCG = 1000pF 2 OPTO DRIVER SHORT-CIRCUIT CURRENT (mA) –50 0 0 5 6 7 8 9 10 11 12 13 14 5 6 7 8 9 10 11 12 13 14 –50 –25 0 25 50 75 100 125 150 V V TEMPERATURE ( DD (V) DD (V) °C) 1698 G17 1698 G18 1698 G24
Driver Rise, Fall and Propagation SYNC Input to Driver Output Delay Driver Disable Time-Out vs SYNC Delay vs Driver Load vs Temperature Frequency
90 90 30 2.2 V NORMALIZED DRIVER DISABLE TIME-OUT DD = 8V VDD = 8V VDD = 8V 80 TA = 25°C 80 CCG = CFG = 1000pF TA = 25°C f µs) SYNC = 100kHz ( 25 2.0 70 CG, FG t 70 PLH DISS 60 60 t 20 DISS × fSYNC 1.8 tDISS CG, FG tPLH 50 50 t × f tr (ns) 15 f 1.6 SYNC 40 CG, FG t t d 40 CG, FG tPHL TIME (ns) PHL 30 30 10 1.4 20 20 tDISS 5 1.2 10 10 DRIVER DISABLE TIME-OUT t 0 0 0 1.0 0 2000 4000 6000 8000 10000 –50 –25 0 25 50 75 100 125 150 50 100 150 200 250 300 350 400 450 500 DRIVER LOAD (pF) TEMPERATURE (°C) fSYNC (kHz) 1698 G25 1698 G26 1698 G27 1698f 6
