30 Mar '12, 4pm

Interesting column by Bob Zollo on Electronic Design site: Conquer The Challenges Of High-Current Pulses

Interesting column by Bob Zollo on Electronic Design site: Conquer The Challenges Of High-Current Pulses

Dynamic loads create some of the most challenging application problems for power supplies. Rapidly changing currents or pulsed currents are extremely difficult to manage. Many devices under test (DUTs) impose rapidly changed currents or pulsed loads on their power supplies. For battery-powered devices, like smart phones, designers will employ power management techniques to optimize runtime. Their power management algorithms will turn phone subsystems on and off to conserve power, producing a rapidly changing current. A GSM transmit pulse will draw current with a slew rate of 0.15 A/µs during the approximately 600-µs wide transmit pulse. The fast edges of the transmit pulses will cause a regular power supply’s output voltage to droop during the pulse, resulting in the wrong voltage at the DUT during the transmit time and a lot of voltage instability as the pulses come and g...

Full article: http://electronicdesign.com/article/test-and-measurement/...

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