Design and validation testing of the SEE-hardened IS1825ASRH pulse width modulator

The industry standard 1825A voltage- or current-mode PWM controller has well known SEE problems when operated in a proton and heavy ion environment. We describe design considerations and SEE validation testing results of a version of the 1825A PWM that is hardened against these effects. The hardened part uses latch redundancy and hardened complementary BiCMOS processing to achieve improved SEE performance.