MAX44211 Output Protection

MAX44211-Output-Protection.jpg

Unwanted transients emanating from the power line back to the line-driver’s output and back-EMF generated by the coupling circuit when the load is disconnected and connected, and vice versa, create undesirable over-voltage conditions. Back-EMF is also generated when the line driver outputs are toggled from high to low impedance state, if significant current was flowing at the disconnect time. The MAX44211 power line communications driver most often is placed facing the power line with an isolating stage between them. In case of such over-stress conditions, external protection is required to protect the MAX44211 and downstream circuits.

The internal ESD clamping structure is present inside MAX44211 (see Figure) to protect the part from ESD or sub-microsecond events. When the application has hazards where these events can occur frequently and for comparatively longer time, it is recommended to have external protection circuitry. Failure to accommodate an output protection can result in over-stressing the outputs (OUT+/ OUT-) and eventually damage the part.

This application note provides insights and information on how to add external protection circuitry at the outputs of the MAX44211. A circuit using VAVDD = 15V is used in this application note.

The figure shows the internal ESD clamping protection structure.

Download PDF: MAX44211-Output-Protection

Source: Maxim Integrated

Advertisements

Author: Ankit Modi

I have received my M.Tech. (Power Electronics, Machines and Drives) and B.E. (Electrical Engineering) degrees in the year of 2013 and 2010 respectively. I have worked as a lecturer in C. K. Pithawalla College of Engineering and Technology, Surat for 2 years. I am currently working as an assistant professor in Electrical Engineering Department in Sankalchand Patel College of Engineering, Visnagar since May-2014.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s