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DATA SHEET
8.7
PSON_L INPUT
The PSON_L is an internally pulled-up (3.3 V) input signal to enable/disable the main output V1 of the front-end. This active-
low pin is also used to clear any latched fault condition. The timing diagram is given in Figure 29 and the parameters in
Table 5 .
Table 5 - PSON_L timing
OPERATING CONDITION
MIN
MAX
UNIT
t PSON_L V1on
t PSON_L V1off
t PSON_L H min
PSON_L to V 1 delay (on)
PSON_L to V 1 delay (off)
PSON_L minimum High time
2
2
10
20
20
ms
ms
ms
8.8
PWOK_H SIGNAL
The PWOK_H is an open drain output with an internal pull-up to 3.3 V indicating whether both V SB and V 1 outputs are within
regulation. This pin is active-low. The timing diagram is shown in Figure 26 / Figure 29 and referenced in the Table 6 .
Figure 29 - PSON_L turn-on/off timing
Table 6 - PWOK_H timing
OPERATIN G CONDITION
MIN MAX UNIT
t PWOK_H del
PWOK_H to V 1 delay (on)
100 500
ms
PWOK_H to V 1 delay (off)
AC
Input
caused by:
PSKILL_H
PSON_L, ACOK_H, OT, Fan
0
1
1
2.5
ms
ms
V SB
t PWOK_H warn*) Failure
V 1
PSON_L
t PSON_L V1on
t V1 rise
t PSON_L H min
t PSON_L V1off
UV and OV on VSB
OC on V1 (Software trigger)
OC on V1 (Hardware trigger)
OV on V1
1
-11
-1
-3
30
0
0
0
ms
ms
ms
ms
ACOK_H
*) A positive value means a warning time, a negative value a
PWOK_H
8.9
t PWOK_H del
CURRENT SHARE
t PWOK_H warn
delay (after fact).
The PFE front-ends have an active current share scheme implemented for V 1 . All the ISHARE current share pins need to be
interconnected in order to activate the sharing function. If a supply has an internal fault or is not turned on, it will disconnect
its ISHARE pin from the share bus. This will prevent dragging the output down (or up) in such cases.
The current share function uses a digital bi-directional data exchange on a recessive bus configuration to transmit and re-
ceive current share information. The controller implements a Master/Slave current share function. The power supply provid-
ing the largest current among the group is automatically the Master. The other supplies will operate as Slaves and increase
their output current to a value close to the Master by slightly increasing their output voltage. The voltage increase is limited to
+250 mV.
The standby output uses a passive current share method (droop output voltage characteristic).
8.10 SENSE INPUTS
Both main and standby outputs have sense lines implemented to compensate for voltage drop on load wires. The maximum
allowed voltage drop is 200 mV on the positive rail and 100 mV on the PGND rail.
With open sense inputs the main output voltage will rise by 270 mV and the standby output by 50 mV. Therefore if not used,
these inputs should be connected to the power output and PGND close to the power supply connector. The sense inputs are
protected against short circuit. In this case the power supply will shut down.
8.11 HOT-STANDBY OPERATION
The hot-standby operation is an operating mode allowing to further increase efficiency at light load conditions in a redundant
power supply system. Under specific conditions one of the power supplies is allowed to disable its DC/DC stage. This will
save the power losses associated with this power supply and at the same time the other power supply will operate in a load
range having a better efficiency. In order to enable the hot standby operation, the HOTSTANDBYEN_H and the ISHARE pins
need to be interconnected. A power supply will only be allowed to enter the hot-standby mode, when the HOT-
STANDBYEN_H pin is high, the load current is low (see Figure 30 ) and the supply was allowed to enter the hot-standby
mode by the system controller via the appropriate I 2 C command (by default disabled). The system controller needs to ensure
that only one of the power supplies is allowed to enter the hot-standby mode.
PFE850-12-054xA
12
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