+48V, Single-Port Network Power Switch
For Power-Over-LAN
______________________________________________________________________________________ 13
INCREMENT
OVERCURRENT
COUNTER
N
N
Y
RESET
OVERCURRENT
COUNTER
N
POK LOW
AFTER tPOK_DLY
HIGH TO LOW
N
Y
N
EN = HIGH?
RESET
POWER-ON
N
Y
N
RESET COUNTERS
START PD DECTECTION
FORCE OUT = VPBI
(4V)
WAIT I/2t
DET
Cl0 = CL1 = CL2 = HIGH
START
PD CLASSIFICATION
CL0 = CL1 = CL2 = HIGH
Y
N
CLASS = H?
Y
START POWER-UP
RESET
FAULT AND ZC
Y
INCREMENT
t
ZCDEL
tZCDEL
= 350ms?
SWITCH SHUTOFF
FAULT = LOW
Y
LATCH = HIBH
Y
EN = LOW?
Y
Y
N
N
N
SWITCH
SHUT-OFF
ZC = LOW
RESET t
ZCDEL
OVERCURRENT
DETECTED
ZC_EN =
HIGH?
N
Y
INCREMENT
tZC_DEG
RESET
tZC_DEG
Y
IS DCA HIGH?
SAMPLE AND HOLD
I
SENSE1
MEASURE
I
DET
= I
SENSE2
- I
SENSE1
WAIT t
DCA
OUTPUT IN HIGH-Z
N
Y
N
REPORT CLASS
STATUS
THERMAL
SHUTDOWN
DETECTED?
N
Y
IS POK HIGH?
RESET
t
ZC_DEG
t
ZCDEL
Y
N
Y
N
t
RESTART
ELAPSED?
Y
N
Y
Y
V
IN
> UVLO
TH
?
IS
(V
PBI
- V
PBI
)/I
DET
OK?
VOUT
- VIN < VTHPOK?
OVERCURRENT
CONDITION?
OVERCURRENT
COUNTER = 60?
POK HIGH
AFTER
t
POK_DLY
LOW TO HIGH
Is I
OUT
< I
ZCTH
?
tZC_DEG =
10ms?
Note 1
FORCE
V
OUT
= V
CLASS
(17.5V)
WAIT t
CLASS
and MEASURE I
CLASS
FORCE OUT = V
PBI
(8V)
WAIT 1/2t
DET
*FOR THE MAX5922B, THE DCA FUNCTION IS INTERNALLY DISABLED. FOR THE MAX5922C, THE DCA FUNCTION IS INTERNALLY ENABLED.
Figure 2. Operational Flow Chart (MAX5922A and MAX5922B/MAX5922C with DET_DIS Connected Low)
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