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Monitoring and controlling negative power supplies with power manager devices

Posted: 04 Sep 2009     Print Version  Bookmark and Share

Keywords:power supplies  power manager devices  ispPAC-POWR1208 monitor 

Lattice Semiconductor's ispPAC-POWR1208 and ispPAC-POWR604 both provide a single-chip solution for monitoring, sequencing and controlling on-board power supply systems. These devices incorporate both in-system programmable logic as well as analogue circuits to perform the majority of functions required to implement a power supply sequencing and monitoring system.

The ispPAC-POWR1208 provides analogue voltage monitoring functions for up to 12 external points. The analogue monitor inputs may accept signals from 0 to 6V without the addition of external protection circuitry. Each of the 12 comparator trip points may be set independently over a range covering 1.03V to 5.74V, with 192 available values. The ispPAC-POWR604 offers similar capabilities, except that it supports six analogue monitor inputs.

The ispPAC-POWR1208 operates from a single positive power supply ranging from 2.25V to 5.5V and provides direct glue-less support for both monitoring positive voltage signals and switching positive supply rails using n-channel power MOSFETs. In some board-level power systems, however, there may be a need for monitoring and controlling negative-voltage power supplies. In many cases, both the ispPAC-POWR1208 and ispPAC-POWR604 can provide monitor and control functions for negative-voltage systems with the addition of a few inexpensive discrete components. This application note presents some simple interface techniques, which may be used to allow the ispPAC-POWR1208 to both monitor and control negative power systems. Although for the sake of simplicity, this application note refers to the ispPAC-POWR1208, all of the techniques presented here are also equally applicable for use with the ispPAC-POWR604.

View the PDF document for more information.





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