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LTC4278 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4278 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 32 page  LTC4290/LTC4271 8 429071f Classification Transient Response to 40mA Load Step TYPICAL PERFORMANCE CHARACTERISTICS Powering Up into a 180µF Load Classification Current Compliance VDD Supply Current vs Voltage VEE Supply Current vs Voltage 802.3af Power On Sequence in AUTO Pin Mode 802.3at Power On Sequence in AUTO Pin Mode Power On Sequence with 10VPP 60Hz Noise FORCED CURRENT DETECTION VEE = –55V CLASS 3 PD VEE 50ms/DIV –60 –10 –20 –30 –40 –50 0 429071 G01 FORCED VOLTAGE DETECTION 802.3af CLASSIFICATION POWER ON AGND FORCED CURRENT DETECTION VEE = –55V CLASS 4 PD VEE 50ms/DIV –60 –10 –20 –30 –40 –50 0 429071 G02 FORCED VOLTAGE DETECTION 802.3at CLASSIFICATION POWER ON AGND AGND 50ms/DIV –25 0 –5 –10 –15 –20 5 429071 G03 FORCED VOLTAGE DETECTION 802.3af CLASSIFICATION POWER ON PORT OFF FORCED CURRENT DETECTION NORMAL DETECT DETECT WITH 60Hz NOISE 5ms/DIV 429071 G04 FET ON FOLDBACK VEE = –54V AGND VEE VEE 0mA PORT VOLTAGE 20V/DIV PORT CURRENT 200mA/DIV GATE VOLTAGE 10V/DIV 425mA CURRENT LIMIT LOAD FULLY CHARGED 50µs/DIV 40mA 0mA 429071 G05 –20V PORT VOLTAGE 1V/DIV PORT CURRENT 20mA/DIV VDD = 3.3V VEE = –54V CLASSIFICATION CURRENT (mA) 429071 G06 0 20 10 30 40 50 60 70 0 –2 –4 –6 –8 –10 –12 –14 –16 –18 –20 VDD SUPPLY VOLTAGE (V) 429071 G07 2.7 2.9 2.8 3.0 3.1 3.2 3.3 3.4 3.6 3.5 15.0 12.0 9.0 6.0 3.0 0.0 –40 25°C 85°C VEE SUPPLY VOLTAGE (V) 429071 G08 –60 –50 –40 –30 –20 9.0 8.5 8.0 7.0 7.5 6.5 6.0 –40 25°C 85°C |
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