DatasheetsPDF.com

AN718

Vishay Intertechnology
Part Number AN718
Manufacturer Vishay Intertechnology
Description Powering The Pentium Vre With The Si9145 Voltage Mode Controlled PWM Converter
Published Oct 4, 2005
Detailed Description AN718 Vishay Siliconix AN718 Powering the Pentium™ VRE with the Si9145 Voltage Mode Controlled PWM Converter BENEFITS •...
Datasheet PDF File AN718 PDF File

AN718
AN718

Overview
AN718 Vishay Siliconix AN718 Powering the Pentium™ VRE with the Si9145 Voltage Mode Controlled PWM Converter BENEFITS • First and only Intel-approved switching converter solution to provide static and dynamic voltage regulation for the Pentium VRE microprocessor.
• Low cost • Efficiency greater than 89% at 7 A • Eliminates the need for heat sinks • Supplies maximum currents required by P54C • High operating frequency (recommended 375 kHz) allows use of the smallest possible inductors and capacitors, resulting in lowest voltage ripple and best transient response • Easily adjustable output voltage to meet the different specs of P54C family.
• PCB layout available • Available in SO-16 surface-mount package The Si9145BY consistently satisfies Pentium VRE voltage regulation limits within generous margins.
Worst-case assumptions for voltage regulation, as provided by Intel, are displayed in Figure 2.
REGULATION REQUIREMENTS FOR THE VRE PENTIUM CONVERTER The Pentium VRE microprocessor has been designed to operate faster and more efficiently than any of its predecessors.
To save power, a CPU clock has been implemented with start/stop features, requiring an ultra-fast response from the power supply.
To obtain higher clock speeds and to enhance manufacturing yields, the Pentium requires specific output voltage levels with tight voltage regulations (Figure 3).
Within this stringent voltage regulation limit, no overshoot or undershoot are permitted to exceed the regulation limit, irrespective of their duration.
Not surprisingly, these new demands have overwhelmed the capabilities of existing power supply designs based on conventional PWM ICs.
Meeting the tight static and transient regulation demands of the Pentium VRE microprocessor requires a certain amount of decoupling capacitance both at the processor and at the output of the power supply.
Obviously, the greater the decoupling capacitance, the easier it is to meet the transient regulation.
Since cost and space limit the a...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)