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LTC3769 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3769 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 28 page  LTC7820 6 7820fc For more information www.linear.com/LTC7820 TYPICAL PERFORMANCE CHARACTERISTICS Driver Voltage vs Frequency, in Figure 7 VCC Shutdown Current vs Temperature Short-Circuit and Retry 24V to 12V Divider Shutdown 48V to 24V Voltage Divider, RUN Pin FLOAT INTVCC Line Regulation 200ms/DIV VOUT 10V/DIV FAULT 10V/DIV TIMER 5V/DIV SW3 20V/DIV 7820 G13 VCC VOLTAGE (V) 0 10 6 2 4 5 3 0 1 60 40 7820 G10 80 50 30 70 20 TEMPERATURE (°C) –50 85 60 80 70 75 65 40 50 45 55 100 50 7820 G11 150 0 VCC = 12V VCC = 48V VCC = 72V FREQUENCY (kHz) 0 5.8 4.8 5.6 5.2 5.4 5.0 4.0 4.4 4.2 4.6 1000 800 600 400 7820 G12 1200 200 INTVCC BOOST3-SW3 BOOST2-VLOW BOOST1-SW1 25°C 125°C –45°C 25°C 125°C –45°C 25°C 125°C –45°C 25°C 125°C –45°C 100ms/DIV VOUT 20V/DIV VIN 20V/DIV RUN 5V/DIV SW3 20V/DIV 7820 G15 TA = 25°C, unless otherwise noted. Start-Up 48V to 24V Voltage Divider, RUN Pin FLOAT 100ms/DIV VOUT 20V/DIV VIN 20V/DIV RUN 5V/DIV SW3 20V/DIV 7820 G14 Input Current During Short Circuit 48V to 24V Divider Divider Efficiency vs CFLY in Figure 11 Voltage Divider Line Transient tr = tr = 100µs, fS = 500kHz 5µs/DIV VIN 20V/DIV VOUT 20V/DIV SW3 50V/DIV IIN 20A/DIV 7820 G16 100µs/DIV VIN 5V/DIV VOUT 5V/DIV SW3 10V/DIV 7820 G17 48V to 24V AT 10A LOAD 24V to 12V AT 20A LOAD QUANTITY OF 10µF CFLY IN PARALLEL 8 10 12 14 16 96 97 98 99 100 7820 G18 |
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