Global Sources
EE Times-India
Stay in touch with EE Times India
EE Times-India > Power/Alternative Energy
Power/Alternative Energy  

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.

Comment on "Monitoring and controlling negative ..."
*  You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.


Go to top             Connect on Facebook      Follow us on Twitter      Follow us on Orkut

Back to Top