8
PET2000-12-074xD
10.
10.1
ELECTRICAL CHARACTERISTICS
PARAMETER
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
PSON_H / HOTSTANDBYEN_H
PSON_L: Main output enabled
VIL
VIH
Input Low Level Voltage
Input High Level Voltage
-0.2
0.8
V
V
HOTSTANDBYEN_H: Hot Standby mode
not allowed
PSON_L: Main output disabled
2
3.5
1
HOTSTANDBYEN_H: Hot Standby mode
allowed
IIL,H
Maximum Input Sink or Source Current
Internal Pull up Resistor to internal 3.3 V
VI = -0.2 V to +3.5 V
-1
mA
Rpull up
10
kΩ
Maximum external Pull down Resistance
to GND to obtain Low Level
Minimum external Pull down Resistance
to GND to obtain High Level
RLOW
RHIGH
1
kΩ
kΩ
50
PWOK_H
VOL
Output Low Level Voltage
V1 or VSB out of regulation, VIsink < 4 mA
V1 and VSB in regulation, Isource < 0.5 mA
0
0.4
3.5
V
V
VOH
Output High Level Voltage
Internal Pull up Resistor to internal 3.3 V
Maximum Sink Current
2.4
Rpull up
IOL
1
kΩ
mA
VO < 0.4 V
4
10.2
SENSE INPUTS
The main output has sense lines implemented to compensate for voltage drop on load wires in both positive and negative
path. The maximum allowed voltage drop is 200 mV on the positive rail and 100 mV on the GND rail.
With open sense inputs the main output voltage will rise by 270 mV. Therefore, if not used, these inputs should be connected
to the power output and GND at the power supply connector. The sense inputs are protected against short circuit. In this case
the power supply will shut down.
10.3
CURRENT SHARE
The PET front-ends have an active current share scheme implemented for V1. 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 an analog bus to transmit and receive current share information. The controller implements a
Master/Slave current share function. The power supply providing 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).
10.4
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.
With low level input the main output is enabled. This active-low pin is also used to clear any latched fault condition.
The PSON_L can be either controlled by an open collector device or by a voltage source.
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