QPO-1-EVAL1 Vicor

USER GUIDE UG:313 QPO-1-EVAL1 QPO Active Output Filter Evaluation Board Contents Page Introduction Introduction 1 The QPO-1-EVAL1 is designed to allow full testing of the QPO-1LZ, along with its various performance options, to fully optimize a final system design. The board offers two terminal options for vertical or Features 1 horizontal mounting. The user must select the required values for the RHR, RSCSET and RSA resistors QPO-1-EVAL1 BOM 3 and solder them in the designated positions before applying power to the EVAL1. Please refer to the QPO-1LZ product data sheet, schematics and the following pages for the proper application Installed Components 3 of this board. User Defined Components 3 The QPO-1 output ripple attenuator SiP uses active filtering to reduce output ripple and noise (PARD) Function Descriptions 4 over 30dB from 500Hz to 500kHz and can be extended down to 50Hz with additional capacitance added to the VREF pin. The QPO-1LZ operates over a voltage range from 3 to 30V and supports load DC Slope Adjust 4 currents as high as 10A. Output regulation is maintained with remote sense or trim adjustment of the Headroom Adjust 4 power supply. The closed loop architecture improves transient response and ensures quiet point-of-load regulation when used in conjunction with the power supplys control loop or trim node. SC Function 4 Remote Sense 4 Features Start-up Circuit 6 Peak Detector 6 nn> 30dB PARD attenuation, 1 500kHz nn3 30V operating range Ordering Information 8 DC nn10A rating nnSupports precise point-of-load regulation through use of remote sensing or converter trimming nnOptional start-up circuit included nnUser-selectable performance optimization for attenuation, power dissipation and transient response nnHorizontal or vertical mounting options nnEvaluation board includes a Johnson Jack for low-noise measurement of the QPOs filtering performance Figure 1 Top view of evaluation board UG:313 Page 1QPO-1 Performance The waveforms in Figure 2 highlight the QPO-1s ability to both filter a converters output ripple and maintain a constant output voltage during a load transient. The input voltage of the QPO-1 (dark blue) shows varying amplitude and frequency PARD before and during the load transient, but the QPO-1 output voltage (light blue) remains relatively unaffected. The load transient is a 1 10A load step (green). The converter used is a Vicor Mini, 48V to 5V converter (Model number: V48B5C200BN). Figure 2 PARD and Transient Attenuation Figure 3 Evaluation board schematic J12 J11 J8 C1 RSENSE 15F 51.1 J7 J3 J6 QPO IN QPO OUT J2 1.00k RP CESR 15F J6 Peak Det CESR Start-up Circuit RSCSET SC Set J5 SC TBD R2 RSA TBD 100 Slope Adj DZ1 RSU 18V Q1 J1 VREF 20.0k IRLML5103TRPBF VREF Gnd Gnd J4 RHR CHR CP CSU J9 TBD Opt Opt 1F J10 J1 UG:313 Page 2