1400 - Platform Manager 2 & L-ASC10: What is Hot Swap? And how does a Power Manager device do it?
Hot Swapping refers to inserting or removing a circuit card from a powered backplane. The circuit card presents an almost dead short to the supplies on the backplane with the discharged capacitors (bulk filtering, bypass, and hold-up). This dead short can cause a power-dip or brown-out on the backplane which can result in a series of resets to the other cards already in the system. A hot swap controller limits the inrush current to prevent the power-dip by modulating a series MOSFET based on the measured current. The following reference designs explain this concept in greater detail:
RD1057 5V and 3V Hot Swap Controller
RD1068 12V Hot Swap Controller with POWR1220AT8
RD1070 AMC Module Power Management
Related Articles
1476 - Power Manager II: Can I use an ispPAC-POWR1220 for -48V hot-swap control?
Although most of our applications literature shows the ispPAC-POWR607 in -48V hot-swap applications, it is possible to also use an ispPAC-POWR1220. It is generally not preferable to the ispPAC-POWR607 for the following reasons: It is physically ...
1399 - Power Manager II: How does the POWR1220AT8 control a 12V hot swap MOSFET when the maximum HVOUT voltage is 12V?
First of all, only the dash-two (POWR1220AT8-2) Power Manager devices support HVOUT output voltage of 12V. Secondly, the gate of the hot swap MOSFET does need to be driven to 18V to 20V in order to turn it on. This is accomplished using a few ...
2721 - Can Power Manager II Device support Hot Socketing?
Yes, Power Manager II device supports Hot Socketing. All the pins of the Power Manager II are Hot Socket complaint. There is no problem in applying maximum specified I/O voltages to the pins before VCCD or VCCA is applied. However small leakage ...
1402 - Platform Manager 2 & L-ASC10: Do you have any examples of logging power supply faults?
We have several reference designs for Power Manager devices that show how to detect a power supply fault (over voltage or under voltage) and save the data in a SPI memory. Using a current to voltage circuit the fault could also be an over current. ...
5948 - Platform Manager 2 & L-ASC10: What is the Power ramp rate for L-ASC10?
Power supply ramp rates for all Vcc and Vccio has a minimum of 0.01 V/ms and Maximum of 100 V/ms, as indicated in page 06 of document: FPGA-DS-02036 The VCCA, VCC, VCCIO0, VCCIO1, and VCCIO3 pins should be connected to the same power supply, as also ...