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DATA SHEET
If a power supply is in a fault condition, it will pull low its active-high HOTSTANDBYEN_H pin which indicates to the other
power supply that it is not allowed to enter the hot-standby mode or that it needs to return to normal operation should it al-
ready have been in the hot-standby mode.
NOTE : The system controller needs to ensure that only one of the power supplies is allowed to enter the hot-standby model.
Figure 31 shows the achievable power loss savings when using the hot-standby mode operation. A total power loss reduc-
tion of 45% is achievable.
Figure 30 - Hot-standby enable/disable current thresholds
Figure 31 - PSU power losses with/without hot-standby mode
60
50
40
2 PSU on
30
1 PSU on
20
Total
System
10
Hot-Standby Disabled
Hot-Standby Enabled
36A 45A
90A
Current
0
0
100
200
300
400
500
600
700
800
Po [W]
Figure 32 - Recommended hot-standby configuration
PSU 1
VSB
CS
HOTSTANDBYEN
PRESENT_L
3 x 3k3
PSU 2
VSB
CS
HOTSTANDBYEN
PRESENT_L
In order to prevent voltage dips when the active power supply is unplugged while the other is in hot-standby mode, it is
strongly recommended to add the external circuit as shown in Figure 32 . If the PRESENT_L pin status needs also to be read
by the system controller, it is recommended to exchange the bipolar transistors with small signal MOS transistors or with
digital transistors.
8.12 I 2 C / SMBUS COMMUNICATION
The interface driver in the PFE supply is referenced to the V 1 Return. The PFE supply is a communication Slave device only;
it never initiates messages on the I 2 C/SMBus by itself. The communication bus voltage and timing is defined in Table 7 fur-
ther characterized through:
Figure 33 - Physical layer of communication interface
?
?
?
?
?
?
There are no internal pull-up resistors
The SDA/SCL IOs are 3.3/5 V tolerant
Full SMBus clock speed of 100 kbps
Clock stretching limited to 1 ms
SCL low time-out of >25 ms with recovery
within 10 ms
Recognizes any time Start/Stop bus conditions
RX
TX
3.3/5V
R pull-up
SDA/SCL
The SMB_ALERT_L signal indicates that the power supply is experiencing a problem that the system agent should investi-
gate. This is a logical OR of the Shutdown and Warning events. The power supply responds to a read command on the gen-
eral SMB_ALERT_L call address 25(0x19) by sending its status register.
BCD.00012_AI Oct-24-2013
13
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