Description
Conventional small-signal analysis of current-mode control, combined with classical loop measurement techniques, has guided power supply designers for nearly thirty years. As switching frequencies increase to the megahertz range, timing delays introduced by circuit components begin to affect overall loop response creating discrepancies between measured and predicted results. Using the example of a buck converter, this paper re-examines a small-signal current-mode control model from a circuit analysis perspective, discusses circuit parameter effects on loop performance and, in particular, investigates their impact on the open-loop gain of the modulator.

PRESENTER
Brian Lynch – Brian's experience includes 19 years of power supply design and development for custom and standard product AC/DC and DC/DC converters for merchant vendors and computer OEM's. Brian joined TI/Unitrode in 1997 and applies his experience in his current role as leader of the team responsible for the definitions of the TPS40k™ series of DC/DC controllers. Brian earned his BSEE from Worcester Polytechnic Institute in 1978 and holds a patent in Predictive Gate Drive™ technology.

Objective

Key Learning

Course Modules
1. Module 01