IRS20955S and IRS20957S Comparison Application Note

This application note provides a detailed comparison between the IRS20955S and IRS20957S MOSFET drivers, focusing on their differences and improvements. The IRS20957S is presented as a high voltage, high speed MOSFET driver designed specifically for Class D audio amplifier applications, and is described as an enhanced version of the IRS20955S. The document outlines electrical characteristic differences, including absolute maximum ratings and recommended operating conditions for both devices. It highlights the logic status differences, particularly how the IRS20957S handles narrow input pulses more effectively than the IRS20955S, which may flip logic states under certain conditions. Additionally, the note discusses the VCLAMPH differences and the implications for upgrading from the IRS20955S to the IRS20957S, emphasizing the advantages of the latter in terms of propagation delay and noise immunity. The summary concludes with a recommendation against using the IRS20955S for new designs.