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ADP1046DC1-EVALZ Datasheet(PDF) 23 Page - Analog Devices |
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ADP1046DC1-EVALZ Datasheet(HTML) 23 Page - Analog Devices |
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23 / 96 page  Data Sheet ADP1046 Rev. 0 | Page 23 of 96 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 26. 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 27. 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 28 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 28 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 28. 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 29. Light Load Mode (Yellow Is Bus Voltage; Red Is VS1 Voltage; Green Is OrFET Control Signal; Blue Is Load Current) |
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