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Controllers tout faster response to load transients

Posted: 19 Apr 2007     Print Version  Bookmark and Share

Keywords:dual-edge PWM technology  dual-edge multi-phase controllers  power computing 

ON Semiconductor has added to its power-computing portfolio two new dual-edge multi-phase controllers. The NCP5387 and NCP5382 address power needs for servers and for desktop PCs based on VR10.x, VR.11.0 and Parallel VID.

Using the company's dual-edge pulse width modulation (PWM) technology, the new devices promise faster response to load transients than existing solutions. As such, they enable power-management subsystems to quickly and efficiently respond to users' activation of high-performance computing functions.

Dual-edge approach
Industry-standard single-edge and clocked control devices on the market today require operation at higher-than-optimal frequencies or use of substantial capacitive hold-up circuits. ON Semi said its dual-edge approach is less complicated to design-in, and enables a physically smaller power management subsystem than single-edge or clocked control devices can provide. By enabling simultaneous switching of all phases in a multi-phase power waveform, the company's dual-edge PWM controllers also provide faster responses than single-edge or clocked control devices. This improved response enables the power management subsystem to operate at a lower frequency and with fewer hold-up capacitors than existing approaches.

The NCP5387 and NCP5382 controllers combine differential voltage and current sensing with adaptive voltage positioning. Dual-edge PWM, combined with inductor current sensing, reduces system cost by providing fast initial response to transient load events. Dual-edge multi-phase modulation reduces total bulk and ceramic output capacitance required to satisfy transient load line regulation. A high-performance operational error amplifier is provided, which allows easy compensation of the system. The proprietary Dynamic Reference Injection method makes the error amplifier compensation virtually independent of the system response to VID changes, eliminating trade-offs between overshoot and dynamic VID performance.

'Significant advancement'
"Our dual-edge control technology is changing the way the industry approaches computing power supply design," said Bill Schromm, senior VP and general manager of ON Semiconductor's computing products group. "The fact that our controllers improve power efficiency by up to three per cent is a significant advancement that has been welcomed by our customers."

The NCP5387 is a two-, three- or four-phase controller suitable for VR10.x, VR11.0 and Parallel VID desktop computing systems. It is available in a Pb-free QFN-40 package and priced at Rs.44 ($1.27) per unit in 2,500-unit quantities.

The NCP5382 is a four-, five- or six-phase controller suitable for servers and other low-voltage, high-current power supplies. It is available in a Pb-free QFN-48 package and priced at Rs.88 ($1.75) per unit in 2,500-unit quantities.

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