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LTC4263 数据表(PDF) 7 Page - Linear Technology

部件名 LTC4263
功能描述  Single PoE PSE Controller High Capacitance Legacy Device Detection
PDF  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC4263 数据表(HTML) 7 Page - Linear Technology

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LTC4274
7
4274fa
TYPICAL PERFORMANCE CHARACTERISTICS
Power On Sequence in AUTO Pin
Mode
Powering Up into a 180μF Load
802.3af Classification in
AUTO Pin Mode
2-Event Classification in
AUTO Pin Mode
Classification Transient Response
to 40mA Load Step
Classification Current Compliance
VDD Supply Current vs Voltage
VEE Supply Current vs Voltage
802.3at ILIM Threshold vs
Temperature
100ms/DIV
–70
–60
10
0
–10
–20
–30
–40
–50
4274 G01
PORT 1
VDD = 3.3V
VEE = –54V
FORCED CURRENT DETECTION
FORCED VOLTAGE
DETECTION
802.3af
CLASSIFICATION
POWER ON
GND
VEE
5ms/DIV
GND
0mA
4274 G02
VEE
VEE
GATE
VOLTAGE
10V/DIV
PORT
CURRENT
200 mA/DIV
PORT
VOLTAGE
20V/DIV
FOLDBACK
FET ON
425mA
CURRENT LIMIT
LOAD
FULLY
CHARGED
VDD = 3.3V
VEE = –54V
5ms/DIV
VEE
–18.4
PORT
VOLTAGE
10V/DIV
GND
4274 G03
VDD = 3.3V
VEE = –55V
PD IS CLASS 1
10ms/DIV
VEE
–17.6
PORT
VOLTAGE
10V/DIV
GND
4274 G04
VDD = 3.3V
VEE = –55V
PD IS CLASS 4
1ST CLASS EVENT
2ND CLASS EVENT
50μs/DIV
40mA
0mA
4274 G05
–20V
PORT
VOLTAGE
1V/DIV
PORT
CURRENT
20mA/DIV
VDD = 3.3V
VEE = –54V
CLASSIFICATION CURRENT
–20
–18
–16
–14
–12
–10
–8
–6
–4
–2
0
010
20
30
4274 G06
40
50
60
70
VDD = 3.3V
VEE = –54V
TA = 25°C
VDD SUPPLY VOLTAGE (V)
2.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
2.9
3.1
3.3
3.5
4274 G07
3.7
3.9
4.1
4.3
–40°C
25°C
85°C
VEE SUPPLY VOLTAGE (V)
–60
2.0
2.1
2.2
2.3
2.4
–55 –50 –45 –40
4274 G08
–35 –30 –25 –20
–40°C
25°C
85°C
TEMPERATURE (°C)
–40
210
211
213
212
214
215
840
844
852
848
856
860
040
4274 G09
–80
120
VDD = 3.3V
VEE = –54V
RSENSE = 0.25Ω
REG 48h = C0h



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