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DATA SHEET
V OL
V OH
R puACOK_H
Output Low Level Voltage
Output High Level Voltage
Internal Pull Up Resistor on ACOK_H
I sink < 2 mA
I source < 50 μA
0
2.6
10
0.4
3.5
V
V
kΩ
SMB_ALERT_L Output
V ext
Maximum External Pull Up Voltage
12
V
V OL
I OH
R puSMB_ALERT_L
Output Low Level Voltage
Maximum High Level Leakage Current
Internal Pull Up Resistor on
SMB_ALERT_L
I source < 4 mA
0
None
0.4
10
V
μA
kΩ
8.2
INTERFACING WITH SIGNALS
All signal pins have protection diodes implemented to protect internal circuits. When the power supply is not powered, the
protection devices start clamping at signal pin voltages exceeding ±0.5 V. Therefore all input signals should be driven only
by an open collector/drain to prevent back feeding inputs when the power supply is switched off.
If interconnecting of signal pins of several power supplies is required, then this should be done by decoupling with small sig-
nal schottky diodes as shown in examples in Figure 24 (except for SMB_ALERT_L, ISHARE and I 2 C pins). This will ensure
the pin voltage is not affected by an unpowered power supply.
SMB_ALERT_L pins can be interconnected without decoupling diodes, since these pins have no internal pull up resistor and
use a 15 V zener diode as protection device against positive voltage on pins.
ISHARE pins must be interconnected without any additional components. This in-/output also has a 15 V zener diode as a
protection device and is disconnected from internal circuits when the power supply is switched off.
Figure 24 - Interconnection of Signal Pins
3.3V
PSU 1 PDU
3.3V
PSU 1 PDU
PWOK
VSB_SEL
PSU 2
PSU 2
3.3V
3.3V
PWOK
VSB_SEL
8.3
FRONT LEDS
The front-end has 2 front LEDs showing the status of the supply. LED number one is green and indicates AC power is on or
off, while LED number two is bi-colored: green and yellow, and indicates DC power presence or fault situations. For the posi-
tion of the LEDs see Table 3 lists the different LED status.
Table 3 - LED Status
OPERATING CONDITION
AC LED
AC Line within range
AC Line UV condition
DC LED 1)
PSON_L High
Hot-Standby Mode
V 1 or V SB out of regulation
Over temperature shutdown
Output over voltage shutdown ( V 1 or V SB )
Output over current shutdown ( V 1 or V SB )
Fan error (>15%)
Over temperature warning
Minor fan regulation error (>5%, <15%)
LED SIGNALING
Solid Green
Off
Blinking Yellow (1:1)
Blinking Yellow/Green (1:2)
Solid Yellow
Blinking Yellow/Green (2:1)
Blinking Yellow/Green (1:1)
1)
The order of the criteria in the table corresponds to the testing precedence in the controller.
PFE1100-12-054xA
10
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