USER GUIDE UG:003 PRM-AL Customer Evaluation Boards Contents Page Introduction Introduction 1 A Factorized Power Architecture offers a fundamentally new and improve d a pproach to distributed power. Factorizing DC-DC power conversion into its basic functions isolation and transformation on Board Overview 2 the one hand and output voltage control and regulation on the other and arranging those functions in Recommended Hardware 4 a sequence maximizes power system performance and cost effectiveness. VTM modules put isolated current multiplication and voltage division directly at the point-of-load (PoL), and an upstream PRM Kit 26647 Contains: 4 non-isolated regulator controls the Factorized Bus voltage supplied to the VTM to provide line and load Initial Set Up 4 regulation. With this architecture, the Factorized Bus voltage can be relatively high distribution losses can be minimized with narrower copper traces and the PRM may be located at any convenient location, Baseline Test Procedure 4 either adjacent to or remote from the VTM. PRMs operate from a wide variety of input sources to drive VTM Evaluation Board 8 VTMs. VTMs are extremely fast and quiet and provide voltage division ratios as high as 32. VTMs enable the user to efficiently supply up to 100A from each full VI Chip package at regulated output voltages The DC-DC Converter Chipset 9 as low as 0.8V or higher, as needed. DC Ordering Information 9 With FPA, only a VTM is needed at the PoL. VTMs, unimpeded by serial inductance, feature very high bandwidth and extremely fast transient response, allowing energy to be stored efficiently at the relatively high Factorized Bus voltage. Without bulk capacitors at the PoL, precious board real estate may be reclaimed for essential functions. The density, efficiency, performance, cost-effectiveness and architectural superiority of FPA make it the least intrusive form of distributed power and facilitate the development of more advanced, competitive products. The PRM may be used as a stand alone non-isolated regulation stage, whereas the VTM is intended to be used with a PRM. IMPORTANT NOTICE: Be sure to read this design guide manual thoroughly before using this product. Pay attention to all cautions and warnings. The Customer Evaluation Boards described in this document are intended to acquaint you with the benefits and features of a Factorized Power Architecture (FPA). They are not designed to be installed in end-use equipment. During operation, the power devices and surrounding structures can be operated safely at hi g h te m p e rature s . The list below is not comprehensive and is not a substitute for common sense and good practice. nnRemove power and use caution when connecting and disconnecting test probes and interface lines to avoid inadvertent short circuits and contact with hot surfaces. nnWhen testing electronic products always use approved safety glasses. Follow good laboratory practice and procedures. UG:003 Page 1Board Overview Please take a closer look at the PRM-CB board. Figure 1 is a picture of a PRM-AL mounted to the PRM-CB board. The board has several features that enable the user to fully explore the capabilities of the PRM-AL. Figure 1 PRM-AL mounted to PRM-CB board 1. Source voltage input points are designed to accommodate 10 hardware and Panduit ring lugs. BE CERTAIN THAT THE POLARITY IS CORRECT BEFORE APPLYING POWER. 2. Auxiliary control (H01) access points for PR, IL, TM, PC, and VH, (header shown installed). 3. Reference test point Signal Ground (SG). 4. Adjustment potentiometers for indicated function are used in conjunction with actuation of corresponding switch in Item 5. 5. PRM port connections (switch bank and silk-screen reference). a. Toggling the switch indicated PC to the ON position inhibits the PRM output. b. Toggling the switch indicated IL to the ON position enables an adjustable current limit effected by varying the corresponding IL trim pot (Item 4). c. Toggling the switch indicated SC to the ON position enables adjustment of the output voltage down from the set point determined by the OS resistor by varying the corresponding SC trim pot (Item 4). CAUTION: depending upon the initial output voltage set point determined by the OS resistor it is possible to trim the SC so low that the output shuts off. The minimum output voltage per the data sheet is 26V . DC d. Toggling the switch indicated CD to the ON position places the PRM in Adaptive-Loop regulation mode (for use with the VTM-CB) from the Local-Loop regulation mode. (In Local Loop mode the set voltage is regulated at the output terminals of the PRM.) Adjusting the corresponding CD trim pot (Item 4) changes the gain of the loop to compensate for different OS settings and/or interconnect resistive losses. UG:003 Page 2