Datasheet

LTC4263-1
5
42631fa
TYPICAL PERFORMANCE CHARACTERISTICS
Powering an IEEE 802.3af PD
Powering a Legacy PD with
470μF Bypass Capacitor
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 33Ω Short
100ms/DIV
V
DD48
V
SS
42631 G01
V
OUT
10V/DIV
POWER
ON
DETECTION
PHASE 2
DETECTION
PHASE 1
25ms/DIV
V
DD48
V
SS
42631 G02
V
OUT
20V/DIV
I
OUT
300mA/DIV
0mA
600mA
570mA CURRENT LIMIT
LOAD
FULLY
CHARGED
FOLDBACK
500ms/DIV
V
DD48
V
SS
42631 G10
V
OUT
10V/DIV
I
PORT
1A/DIV
t
ED
500ms/DIV
V
DD48
42631 G11
V
OUT
2V/DIV
t
DBO
R
PORT
= 15.5k
10ms/DIV
V
DD48
V
SS
42631 G12
V
OUT
20V/DIV
I
OUT
300mA/DIV
0mA
600mA
t
OVLD
LOAD
APPLIED
PORT OFF
50ms/DIV
V
DD48
V
SS
42631 G13
V
OUT
10V/DIV
t
MPDO
PORT OFF
PD REMOVAL
1μs/DIV
V
DD48
V
SS
42631 G14
V
OUT
20V/DIV
I
PORT
20A/DIV
0A
20A
I
PORT
= CURRENT IN
1Ω RESISTOR APPLIED
TO OUTPUT OF CIRCUIT
ON FRONT PAGE
1Ω SHORT
APPLIED
100μs/DIV
V
DD48
V
SS
42631 G15
V
OUT
20V/DIV
I
PORT
300mA/DIV
0mA
600mA
CURRENT
LIMIT ACTIVE
33Ω SHORT APPLIED
SHORT
REMOVED
FOLDBACK CURRENT LIMIT
I
PORT
= CURRENT IN 33Ω RESISTOR APPLIED
TO OUTPUT OF CIRCUIT ON FRONT PAGE