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LTC4263CS 数据表(PDF) 5 Page - Linear Technology |
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LTC4263CS 数据表(HTML) 5 Page - Linear Technology |
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5 / 24 page  LTC4263 5 4263fe TYPICAL PERFORMANCE CHARACTERISTICS Powering an IEEE 802.3af PD Powering a Legacy PD with 220μF Bypass Capacitor Classification Transient Response to 40mA Load Step Overload Restart Delay Midspan Backoff with Invalid PD Overcurrent Response Time Response to PD Removal with AC Disconnect Enabled Rapid Response to 1Ω Short Rapid Response to Momentary 50Ω Short 100ms/DIV VDD48 VSS 4263 G01 VOUT 10V/DIV POWER ON CLASSIFICATION DETECTION PHASE 2 DETECTION PHASE 1 25ms/DIV VDD48 VSS 4263 G02 VOUT 20V/DIV IOUT 200mA/DIV 0mA 400mA CLASSIFICATION 425mA CURRENT LIMIT LOAD FULLY CHARGED FOLDBACK 100μs/DIV VDD48 – 18V VDD48 – 19V 4263 G06 VOUT 2V/DIV IOUT 20mA/DIV 0mA 40mA VDD48 – VSS = 48V TA = 25°C 500ms/DIV VDD48 VSS 4263 G10 VOUT 10V/DIV IPORT 500mA/ DIV tED 500ms/DIV VDD48 4263 G11 VOUT 2V/DIV tDBO RPORT = 15.5kΩ 10ms/DIV VDD48 VSS 4263 G12 VOUT 20V/DIV IOUT 200mA/DIV 0mA 400mA tOVLD LOAD APPLIED PORT OFF 50ms/DIV VDD48 VSS 4263 G13 VOUT 10V/DIV tMPDO PORT OFF PD REMOVAL 1μs/DIV VDD48 VSS 4263 G14 VOUT 20V/DIV IPORT 20A/ DIV 0A 20A IPORT = CURRENT IN 1Ω RESISTOR APPLIED TO OUTPUT OF CIRCUIT ON FRONT PAGE 1Ω SHORT APPLIED 100μs/DIV VDD48 VSS 4263 G15 VOUT 20V/DIV IPORT 400mA/DIV 0mA 800mA CURRENT LIMIT ACTIVE 50Ω SHORT APPLIED SHORT REMOVED FOLDBACK CURRENT LIMIT IPORT = CURRENT IN 50Ω RESISTOR APPLIED TO OUTPUT OF CIRCUIT ON FRONT PAGE |
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