TM PRM Regulator for Post PFC Operation S C NRTL US High Efficiency Converter Features Product Ratings V = 45.0 V to 55.0 V P = 250 W IN OUT Optimized for Post PFC operation with = 48.0 V V OUT 48 V holdup capacitance I = 5.21 A OUT (20.0 V to 55.0 V Trim) 48.0 V nominal input non-isolated ZVS buck-boost regulator Transient operation down to 30.0 V for extended holdup during line dropout 20.0 V to 55.0 V adjustable output range 2 250 W output power in 0.57 in footprint Product Description 96.7% typical efficiency, at full load TM 3 3 The VI Chip PRM Regulator is a high e ciency converter, 1676 W/in (102 W/cm ) Power Density operating from a 45.0 to 55.0 Vdc input to generate a regulated 5.29 MHrs MTBF (MIL-HDBK-217 Plus Parts Count) 20.0 to 55.0 Vdc output. The ZVS buck-boost topology enables Pin selectable operating mode high switching frequency (~ 1.03 MHz) operation with high conversion e ciency. High switching frequency reduces the Adaptive Loop size of reactive components enabling power density up to Remote Sense / Child 3 1676 W/in . Half VI Chip Package The Half VI Chip package is compatible with standard pick- 22.0mm x 16.5mm x 6.73mm and-place and surface mount assembly processes with a planar Optimized for use with PFM based thermal interface area and superior thermal conductivity. Isolated AC-48 V DC Converters In a Factorized Power Architecture system, the PRM and downstream VTM current multiplier minimize distribution and conversion losses in a high power solution, providing an Typical Applications isolated, regulated output voltage. The PRM48JH480x250A00 has two selectable modes of High Density Power Supply AC-DC rail outputs regulation depending on the application requirements. High Density ATE system AC-DC power In Adaptive Loop Operation, the PRM48JH480x250A00 utilizes a unique feed-forward scheme that enables precise regulation Telecom NPU and ASIC core power of an isolated POL voltage without the need for remote sensing Communications Systems and voltage feedback. Non-isolated and isolated power converters In Remote Sense Operation, the internal regulation circuitry is disabled, and an external control loop and current sensor maintain regulation. This a ords exibility in the design of both voltage and current compensation loops to optimize performance in the end application. PRM Regulator Rev 1.3 Page 1 of 44 11/2020 PRM48JH480x250A00 PRM48JH480x250A00 Typical Applications PRM ENABLE VAUX REF/ TRIM REF EN R TRIM AL VT SHARE/ VC AC Front End CONTROL NODE SGND IFB GND PRI GND 48 VDC FUSE V OUT AC (L) +OUT +IN +OUT 20 V to 55 V + AC C C MOV IN OUT V IN AC (N) OUT IN OUT SGND SEC GND PRIMARY SECONDARY ISOLATION BOUNDRY HOLDUP CAPACITOR SGND Typical Application: AC-48 VDC Front End + PRM48JH480x250A00 V REF SGND REF 3312 PRM SGND IN OUT Voltage Sense and Error Amplifier (Differential) GND ENABLE VAUX REF/ VTM TRIM REF EN SGND AL VT TM +OUT SGND Voltage Reference with Soft Start AC Front End SHARE/ VC VC CONTROL NODE VTM Start up Pulse V + V PC IFB GND VOUT C SGND OUT LOAD +IN IN PRI GND 48 VDC FUSE +IN AC (L) +OUT +IN +OUT L + F AC C MOV External Current Sense F V IN IN OUT OUT IN OUT AC (N) SGND 1 PRIMARY SECONDARY SEC GND SEC GND PRIMARY SECONDARY ISOLATION BOUNDRY ISOLATION BOUNDRY HOLDUP CAPACITOR SGND Typical Application: AC-48 VDC Front End + PRM48JH480x250A00 + VTM, non-isolated Remote Sense Configuration 1 Non-Isolated Conguration: Out connected to -IN PRM Regulator Rev 1.3 Page 2 of 44 11/2020 Voltage Sense