BobUrman is a senior electrical design engineer with Vapor Bus International, Buffalo Grove, Ill. He holds a BSEE from the University of Illinois, Urbana, and an MISM from the Keller Graduate School of Management, Chicago, Ill. Email address: burman@wabtec.com
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April 10, 2008[Ideas For Design] Unconventional Use Of An Output Driver Protects Current Monitor
One of our products uses a standard 1/10-W surface-mount resistor with a high-side current monitor to detect small load changes at the product’s output. Since this circuit is part of the device’s output, it’s vulnerable to field wiring mishaps. If the field installation results in a shorted output, the resistor, which can’t dissipate much power, will be destroyed. Protecting the resistor with a PTC (positive temperature coefficient) device is...
