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ADP1046AW Datasheet(PDF) 23 Page - Analog Devices

Part No. ADP1046AW
Description  Digital Controller for Isolated
Download  88 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1046AW Datasheet(HTML) 23 Page - Analog Devices

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Data Sheet
ADP1046AW
Rev. 0 | Page 23 of 88
OrFET Operation Examples
Hot Plug into a Live Bus
A new PSU is plugged into a live 12 V bus (yellow). The internal
voltage, VS1 (red), is ramped up before the OrFET is turned on.
After the OrFET is turned on (green), current in the new PSU
begins to flow to the load (blue). The turn-on voltage threshold
between the new PSU and the bus is programmable.
CH2 2.00V
CH4 10.0V
CH1 2.00V
CH3 2.00A
M10.0ms
A CH4
100mV
2
3
4
CS2
VS3
VS1
OrFET
Figure 27. Hot Plug into a Live Bus (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)
Runaway Master
A rogue PSU on the bus (yellow) has a fault condition, causing
the bus voltage to increase above the OVP threshold. The good
PSU turns off the OrFET (green) and regulates its internal volt-
age, VS1 (red). When the rogue power supply fault condition is
removed, the bus voltage decreases. The OrFET of the good PSU
is immediately turned on, and the good PSU resumes regulating
from VS3±.
CH2 2.00V
CH4 10.0V
CH1 2.00V
CH3 2.00A
M50.0ms
A CH4
0mV
3
4
CS2
VS3
VS1
OrFET
Figure 28. Runaway Master (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)
Short Circuit
When one of the output rectifiers fails, the bus voltage can
collapse if the OrFET is not promptly turned off. The fast OrFET
comparator is used to protect the system from this fault event.
Figure 29 shows a short circuit applied to the output capacitors
before the OrFET. After the fast OrFET threshold for CS2± (blue)
is triggered, the OrFET (green) is turned off. Figure 29 also shows
the operation when the short circuit is removed. The internal
regulation point, VS1 (red), returns to 12 V, and the OrFET
(green) is reenabled. The PSU again begins to contribute
current to the load (blue).
CH2 2.00V
CH4 10.0V
CH1 2.00V
CH3 2.00A
M200.0ms
A CH4
7.5mV
3
4
CS2
VS3
OrFET
VS1
Figure 29. Internal Short Circuit (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)
Light Load Mode Operation
PSU 1 increases its voltage at light load from 12 V to 12.1 V
(yellow). Both PSU 1 and PSU 2 are CCM; therefore PSU 1
sources current and PSU 2 sinks current (blue). In PSU 2, the
OrFET control turns off the OrFET to prevent reverse current
from flowing. Note that the OrFET voltage (green) is solid during
this transition because PSU 1 and PSU 2 are in CCM mode.
CH2 2.00V
CH4 10.0V
CH1 2.00V
CH3 2.00A
M5.0ms
A CH4
8.3mV
3
4
CS2
VS3
OrFET
VS1
Figure 30. Light Load Mode (Yellow Is Bus Voltage; Red Is VS1 Voltage;
Green Is OrFET Control Signal; Blue Is Load Current)


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