User Manual

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UG:100 vicorpower.com Applications Engineering: 800 927.9474 Page 1

PF175 AC-DC Converter Evaluation Board

with External Input Filter

USER GUIDE | UG:100

January 2013

Features

n Oscilloscope probe jack for output voltage and ripple measurements

n Simple to use

n Ring lug, screw terminal, and solder connection options

n Replaceable fuse (5A, 216 Littelfuse recommended)

IMPORTANT NOTICE

Please read this document before setting up an evaluation board.

Introduction

This Evaluation Board oers a convenient means to evaluate the performance of Vicor’s

VI Brick® PFM Isolated AC-DC Converter modules with Power Factor Correction, and

has been optimized for user convenience. Refer to Table 1 for operating conditions

and limits.

This reference design contains an input line ﬁlter. It is important to remember the

response of the AC line ﬁlter is dependent upon the wiring connected to the evaluation

board. Care should be exercised to minimize stray source impedances in order to fully

exercise the features of the converter.

Contents Page

Set Up 2

Recommended 4

Hardware

Theory of Operation 5

Thermals

Ordering Information 8

Bill of Materials 8 – 10

Summary of content (12 pages)

PAGE 1
USER GUIDE | UG:100 PF175 AC-DC Converter Evaluation Board with External Input Filter January 2013 Contents Page Set Up 2 Recommended Hardware 4 Features n Oscilloscope probe jack for output voltage and ripple measurements n Simple to use n Ring lug, screw terminal, and solder connection options n Replaceable fuse (5A, 216 Littelfuse recommended) Theory of Operation 5 Thermals Ordering Information 8 Bill of Materials 8 – 10 IMPORTANT NOTICE Please read this document before setting up an evaluation
PAGE 2
Figure 1. VI Brick PFM AC DC Converter Evaluation Board layout and dimensional drawing, component side Basic Specifications and Operating Limits Please use the following table for operating limits: Table 1.
PAGE 3
For single phase power, connect LINE to the pin marked L, NEUTRAL to the pin marked N and earth ground to the pin marked EARTH. Corresponding wires in an IEC cable are brown, blue, and yellow with a green stripe. The board can be used with three phase power. Connect LINE1 to L and LINE2 to N. Earth ground should still be connected to the EARTH terminal of J1. +OUT, –OUT There are several connections available on the VI Brick AC-DC converter. Table 1 lists the available connectors and their current rating.
PAGE 4
Output Voltage Measurement Jack (J12) This connector is provided to make accurate measurements of the output ripple voltage of the VI Brick® AC-DC converter. Many types of scope probes may be directly connected to this point if the probe is equipped with a removable plastic sheath. To avoid creating ground loops when making measurements of the output or input voltage, these measurements should be made separately.
PAGE 5
Theory of Operation The schematic diagram is presented in functional blocks with text descriptions. Component values are given in Bill of Materials, layout in PCB Layout (Figure 7). Soft copies are available with download. Input, Rectifier, and Filter Section Input power is connected to screw terminal block J01. A 5 A fuse in F01 protects against overcurrent. 330 W at 93% efficiency draws 355W. At 85 V input, 4.17A is drawn. Z01 is a 20 mm disk MOV that can withstand higher surges than Z02-Z04.
PAGE 6
Figure 3. Active transient suppression section schematic Output Enable Control The EN pin is pulled low to disable the AC-DC converter. If pulled high to 3.3 V or left floating, the VI Brick® PFM® will operate. A 1x5 0.100” spaced socket allows easy connection to automated test equipment. This part of the circuit is referenced to primary ground. Users can connect their own secondary referenced control circuit by connecting through the optocoupler U01, and connecting to TP12 and TP11 as needed.
PAGE 7
Output Filter Section A common mode inductor should be used at the output to isolate switching noise from this converter so it does not cause beat frequencies with downstream converters. The one used in this reference design is the same used at the input so that a single part number can be stocked. If space is at a premium, a smaller common mode inductor can be substituted. Peak impedance should be between 500 kHz and 5 MHz. C37 is the bulk capacitor default on this board.
PAGE 8
Thermals For most lab environments a fan blowing across the evaluation board is recommended See VI Brick® Thermal Management Application Note at: www.vicorpower.com/documents/application_notes/AN200_VIBrickTherm.pdf or contact Vicor Applications Engineering for assistance (800) 927-9474.
PAGE 9
Ref. Des. Digi-Key Manufacturer Digi-Key Part Number Future Manufacturer Future Part Number DZEN 16V 2% 300mW SOD523 NXP Semiconductor BZX585-B16,115-ND NXP Semiconductor BZX585-B16,115 DZEN 13V 2% 300mW SOD523 NXP Semiconductor BZX585-B13,135 NXP Semiconductor BZX585-B13,135 Diodes Inc BAV19W-7-F Description D05 D06 D07 D08 D10 DPN 100V 200mA SOD-123 Diodes Inc BAV19W-7-F F01 FUSE HOLDER, SMD, 5x20 Wickmann F4546-ND Schurter 31.
PAGE 10
Ref. Des. Digi-Key Manufacturer Digi-Key Part Number Future Manufacturer Future Part Number Vishay Dale 541-2.20FFTR-ND Vishay Dale CRCW12062R20FKEA NOT APPLIED NOT APPLIED NOT APPLIED NOT APPLIED RES 42.2K OHM 1/4W 1% 1206 Vishay Dale 541-42.2KFTR-ND Vishay Dale CRCW120642K2FKEA RES 100 OHM 1/8W 1% 0805 Vishay Dale 541-100CTR-ND Vishay Dale CRCW0805100RFKEA Description R09 RES 2.
PAGE 11
Figure 6. Schematic diagram UG:100 vicorpower.com Applications Engineering: 800 927.
PAGE 12
Figure 7. PCB Layout Left, top layer, right, bottom layer. The Power Behind Performance Rev 1.0 12/2013 vicorpower.com Applications Engineering: 800 927.