End of Life PRM Regulator P048F048T12AL S C NRTL US Non-isolated Regulator Features 48 V input VI Chip PRM Adaptive Loop feedback V = 36 75 V IN Vin range 36 75 Vdc ZVS buck-boost regulator V = 26 55 V OUT 3 P = 120 W High density 407 W/in 1.45 MHz switching frequency OUT I = 2.5 A 2 OUT Small footprint 108 W/in 96% Efficiency Low weight 0.5 oz (15 g) 125 C operation (Tj) Product Description Absolute Maximum Ratings The VI Chip regulator is a very efficient non-isolated regulator capable of both boosting and bucking a wide Parameter Values Unit Notes range input voltage. It is specifically designed to provide +In to -In -1.0 to 85.0 Vdc a controlled Factorized Bus distribution voltage for PC to -In -0.3 to 6.0 Vdc powering downstream VTM Transformer fast, PR to -In -0.3 to 9.0 Vdc efficient, isolated, low noise Point-of-Load (POL) IL to -In -0.3 to 6.0 Vdc converters. In combination, PRMs and VTMs form a VC to -In -0.3 to 18.0 Vdc complete DC-DC converter subsystem offering all of the +Out to -Out -0.3 to 59 Vdc unique benefits of Vicors Factorized Power TM TM Architecture (FPA) : high density and efficiency low SC to -Out -0.3 to 3.0 Vdc noise operation architectural flexibility extremely fast VH to -Out -0.3 to 9.5 Vdc transient response and elimination of bulk capacitance OS to -Out -0.3 to 9.0 Vdc at the Point-of-Load (POL). CD to -Out -0.3 to 9.0 Vdc In FPA systems, the POL voltage is the product of the SG to -Out 100 mA Factorized Bus voltage delivered by the PRM and the Continuous output current 2.5 AdcK-facto (the fixed voltage transformation ratio) of a Continuous output power 120 W downstream VTM. The PRM controls the Factorized Bus 225 C MSL 5 voltage to provide regulation at the POL. Because VTMs Case temperature during reflow 245 C MSL 6 perform true voltage division and current multiplication, Operating junction temperature -40 to 125 C T-Grade the Factorized Bus voltage may be set to a value that is Storage temperature -40 to 125 C T-Grade substantially higher than the bus voltages typically found inintermediate bu systems, reducing distribution losses and enabling use of narrower DC-DC Converter distribution bus traces. A PRM-VTM chip set can provide up to 100 A, or 115 W at a FPA system density of VC VH 3 3 169 A/in , or 195 W/in and because the PRM can PC SC +Out Factorized +In 0.01 F TM SG IL be located, orfactorized remotely from the POL, OS Bus (V ) NC ROS F L NC PRM -AL PR CD +Out these power densities can be effectively doubled. 10 k Module RCD TM O VTM VC +In +Out Module PC 0.4 H The PRM described in this data sheet features a unique A Out V IN 10 Adaptive Loo compensation feedback: a single wire K D In In Out Out Ro alternative to traditional remote sensing and feedback loops that enables precise control of an isolated POL voltage without the need for either a direct connection The P048F048T12AL is used with any 048 input series VTM to provide a regulated and to the load or for noise sensitive, bandwidth limiting, isolated output. isolation devices in the feedback path. PRM Regulator Rev 3.1 vicorpower.com 800 735.6200 Page 1 of 14 12/2013Not Recommended for New Designs P048F048T12AL General Specifications Overview of Adaptive Loop Compensation Adaptive Loop compensation, illustrated in Figure 1, contributes to the The VI Chips bi-directional VC port : bandwidth and speed advantage of Factorized Power. The PRM 1. Provides a wake up signal from the PRM to the VTM that monitors its output current and automatically adjusts its output voltage synchronizes the rise of the VTM output voltage to that of the PRM. to compensate for the voltage drop in the output resistance of the 2. Provides feedback from the VTM to the PRM to enable the PRM to VTM . R sets the desired value of the VTM output voltage, Vout R OS CD compensate for the voltage drop in VTM output resistance, R . O is set to a value that compensates for the output resistance of the VTM (which, ideally, is located at the point of load). For more information on configuring a PRM & VTM pair for adaptive loop, please see AN:024 Accurate Point of Load Voltage Regulation Using Simple Adaptive Loop Feedback. VC VH SC PC +Out Factorized +In 0.01 F SG TM IL OS Bus (V ) F L NC ROS NC PR PRM -AL CD +Out 10 k Module RCD TM O VTM VC +In +Out Module PC 0.4 H A Out V IN 10 K D In In Out Out Ro Figure 1 With Adaptive Loop control, the output of the VTM is regulated over the load current range with only a single interconnect between the PRM and VTM and without the need for isolation in the feedback path. PRM Regulator Rev 3.1 vicorpower.com 800 735.6200 Page 2 of 14 12/2013