Instruction Manual

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UG:013 vicorpower.com Applications Engineering: 800 927.9474 Page 1

Introduction

The PRM

evaluation boards described in this document are designed to use with the

PRM family of PRM regulators and demonstrate the beneﬁts of the Factorized Power

Architecture

™

. These evaluation boards are not designed for installation in end user

equipment. The system demonstrates the use of a PRM (the pre-regulator module)

and a VTM (the current multiplier or the voltage transformation module) for general

laboratory evaluation only.

IMPORTANT NOTICE:

Be sure to read this design guide manual thoroughly before using this product.

Pay attention to all cautions and warnings.

This user guide is not comprehensive and is not substitute for common sense and

good practice. For example:

n When testing electronic product always use approved safety glasses.

n Provide a strain relief for wires and place the system on the bench in such a way as

to prevent accidental displacement from bench top.

n Remove the power and use caution when connecting and disconnecting test probes

and interface lines to avoid unintentional short circuits and contact with

hot surfaces.

n Never use a jumper in place of the fuse. Replace the fuse only with its equivalent

type and rating.

n Never attempt to disconnect the evaluation board from a VTM

evaluation

board while power is applied. This system is not designed to demonstrate the hot

plug capability.

VI Chip

PRM

Evaluation Board

USER GUIDE | UG:013

Written by: Ankur Patel

Applications Engineer

February 2013

Contents Page

Introduction 1

Contents 3

Features 3

Board Description 4

General Components 5

Test Points 7

Sockets 8

Schematic 9

Assembly Drawings 11

Bill of Materials 13

VTM Evaluation Boards 16

Recommended Test 17

Equipment

Board Operating Modes 18

Common Features 19

Default/Adative Loop 20

Operating Mode: PRM

Trim Control 20

AL Control 20

Apative Loop 21

Operating Mode:

PRM & VTM

Remote Sense 21

Operating Mode: PRM

Remote Sense 23

Operating Mode: PRM

& VTM

Trim and Soft Start 24

Adjustment

Current Limit 25

Adjustment

Slave Operating 26

Mode

Paralleling 26

Conclusion 27

Summary of content (27 pages)

PAGE 1
USER GUIDE | UG:013 VI Chip® PRM Evaluation Board Written by: Ankur Patel Applications Engineer February 2013 Contents Page Introduction 1 Contents 3 Features 3 Board Description General Components Test Points Sockets 4 5 7 8 Schematic 9 Introduction The PRM® evaluation boards described in this document are designed to use with the PRM family of PRM regulators and demonstrate the benefits of the Factorized Power Architecture™.
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The PRM® evaluation board can be used to demonstrate a stand-alone buck-boost regulator or in conjunction with a VTM evaluation board to enable evaluation of a Factorized Power Architecture™ (FPA) system. There are many combinations possible using PRM and VTM evaluation boards, but the focus in this user guide is using one PRM evaluation board and one VTM evaluation board, with a brief overview of how to parallel boards.
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Contents All PRM evaluation boards arrive with the following contents. (The user guide can be downloaded from the www.vicorpower.
PAGE 4
Board Description The following section provides a detailed description of the evaluation board components, test points and sockets. Figure 1. Board Description Figure 2. Power/signal connectors pinout, front view -OUT 10 VC 8 -OUT +OUT +OUT 6 4 2 -S 10 9 -OUT 7 VC 5 3 1 -OUT +OUT +OUT 9 +S J13 Power/signal connector UG:013 vicorpower.com V T M_-IN 4 2 8 6 7 5 3 1 V _T M V _PC V _IM J10 Signal connector Applications Engineering: 800 927.
PAGE 5
General Components 1. PRM (PS10) 2. Input lugs: Sized for #10 hardware. Use these for making connection to the input source. This board does not contain reverse polarity protection. Check for proper polarity before applying the power. 3. Input fuse (F10): Appropriately rated. 4. Input filtering: Input capacitor (CIN) and filtering (inductor and ceramic capacitors) allows for stable operation with most input sources.
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General Components (Cont.) 10. Signal connector (J10): Used to transfer VTM® PC, IM, TM, -IN and Output Sense signals between the PRM and VTM boards. TM pin of VTM provides feedback to VT pin of PRM to enable temperature compensation in Adaptive Loop Operation of PRM and VTM. 11. Power/Signal connector (J13): Used to transfer power (+OUT/-OUT) and VC to downstream VTM board when used. 12.
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Test Points Description Each test point has a socket which accepts 0.015 – 0.025 inch diameter leads for easy installation of solid wires and through-hole components. All the test points are brought out to the edge of the board to allow for easy measurement and/or connection to the user’s external circuitry. All test points are labeled and routed to the edge of the board. Each test point is accompanied with an adjacent socket for adding a test lead or to facilitate wiring to external circuitry. Table 2.
PAGE 8
Sockets Description Each socket accepts 0.015 – 0.025 inch diameter leads for easy installation of solid wires and through-hole components for use with external circuit and test equipment. Table 3. Reference Functional Sockets description Designator Name Functional Description H57, H58 Input Sockets are used for easy installation of through-hole 100 V rated Capacitor aluminum-electrolytic capacitor.
PAGE 9
UG:013 vicorpower.
PAGE 10
ENABLE H54 R3 8 1206 T P70 T P42 T P40 SGND R46 0603 SGN D P11 2 4 6 T P72 CN 6_DIGIKEY_95278 1 3 5 CO NN3PIN J17 CONN3PIN J18 TRIM CONT ROL SELECT R3 5 0603 R4 0 T P71 SIGNALS FOR PARALLELING SHARE/CONT ROL NODE SGND TRIM POT EXT TRIM H50 3 2 1 T P69 3 2 1 T RIM EXT AL SGND AL POT H53 R3 7 1206 T P74 T P41 T P39 H49 T P73 SGND P10 2 4 6 AL T P76 CN6_DIGIK EY_95278 1 3 5 AL CONTROL SELECT R3 4 0603 R3 9 T P75 REF_ EN_ B EAO 0603 C23 H43 U12 SGND 3 2 U11A
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Assembly Drawings H57 C17 L10 PS10 PF43 PF44 H56 PF46 R23 J13 H32 J14 C14 C13 C11 C12 PF19 H35 PF49 H33 H36 H27 H25 H24 H11 H17 H34 H12 H16 H18 H13 H21 H10 H22 H15 H19 H14 PF16 J16 PF17 TP26 TP25 PF15 TP27 PF14 TP17 PF13 PF12 TP14 PF11 TP34 PF10 TP18 PF09 TP13 PF08 TP15 PF07 TP21 TP16 PF06 TP10 PF05 TP12 PF04 TP22 PF03 TP11 TP19 PF02 PF01 TP20 J17 J18 R46 H20 TP33 FID01 TP31 H44 H43 C20 R28 H42 J10 L11 PF18 J15 PF41 PF38
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Assembly Drawings (Cont.) Figure 4c. Bottom view: Half-chip/Full-chip evaluation board assembly drawing TP73 TP69 TP70 TP74 TP61 TP63 TP72 TP76 TP71 TP75 TP65 TP68 TP67 TP57 C25 C26 TP66 TP59 TP56 TP58 TP64 TP62 TP46 TP48 TP54 UG:013 TP50 vicorpower.com TP60 TP52 TP49 TP45 TP51 TP47 TP55 TP53 Applications Engineering: 800 927.
PAGE 13
Bill of Materials Following table describes the most common components of all four versions of PRM® evaluation boards. Table 4. Common components Reference Manufacturer Description Manufacturer Part Number Designator C11, C12, C13, C14 CAP X7R 2.2uF 10% TDK CORP OF AMERICA C3225X7R2A225KT5LOU 100V 1210 .102 MAX HT C15, C16, C17 CAP X7R 4.7uF 20% 100V 2220 TDK C5750X7R2A475M C18, C21, C23 CAP X7R .
PAGE 14
Bill of Materials (Cont.) Following table describes the most common components of all four versions of PRM® evaluation boards. Table 4 (Cont.). Common components Reference Manufacturer Manufacturer Description Designator Part Number R26 Design Specific – see Table 5 – Remote Sense Operation – set the constant current limit R28* – not applied – use sockets RES 20K OHM 1/4W 1% AXIAL KOA SPEER MF1/4DCT52R2002F R29 RES 54.
PAGE 15
Bill of Materials (Cont.) Following table describes the design specific components of all four versions of PRM® evaluation boards. Table 5.
PAGE 16
VTM® Evaluation Boards The PRM® evaluation board is designed to work with all types of VTM evaluation boards to facilitate testing of virtually any PRM/VTM combination. The VTM evaluation board contains dual connectors designed to mate with J10 and J13 on PRM evaluation board. The additional signal connector is used to transfer VTM signal pins, as well as S+ and S- signals between boards.
PAGE 17
Figure 7. PRM evaluation board connection to VTM evaluation board Recommended Test Equipment The following is a list of recommended test equipment. 1. DC power supply: 0 - 80 V, 600 W minimum 2. Load: Rated appropriately based on output voltage, current and power requirements. 3. Digital multi-meters (DMMs) 4. Oscilloscope + probes 5. Function generator (for external enable/disable and trim control) 6. Auxiliary bench voltage supply (for external trim and AL control) 7.
PAGE 18
Line and Load connections n Make sure that input power supply is OFF. n Connect the input power supply positive lead to the +IN input lug of the evaluation board. n Connect the input power supply return lead to the –IN input lug of the evaluation board. n Connect the output lug +OUT to the positive terminal of the electronic load. n Connect the output lug –OUT to the return terminal of the electronic load. n Verify proper polarity of the connections. n Place the input capacitance 22 uF, 100 V.
PAGE 19
Figure 9. Switch configuration ON OFF DEFAULT / ADAPTIVE LOOP using PRM ON OFF ADAPTIVE LOOP using PRM and VTM ON OFF LOCAL SENSE (Single Ended) using PRM ON OFF REMOTE SENSE (Differential) using PRM and VTM ON OFF SLAVE using PRM Postion number 1 2 3 4 5 6 7 8 9 10 Figure 9 provides the illustration for how to configure the switch for each operating mode. Common features in all modes of operations n On / off control to enable and disable the PRM® in the presence of input power.
PAGE 20
Default / Adaptive Loop operating mode using PRM® Mode select switch S10 setting: keep the switch OFF at all positions as shown in following illustration. Please note that switch S10 is 10 positions switch. ON OFF Postion number DEFAULT / ADAPTIVE LOOP 1 2 3 4 5 6 7 8 9 10 In default operation, PRM maintains its own output voltage using active internal voltage sensing. Also internal current sensing circuit is active for constant current limit.
PAGE 21
Figure 12. Adaptive Loop selection TP73 H49 TP76 TP75 P10 TP39 1 2 3 4 AL 5 6 CN6_DIGIKEY_95278 EXT AL AL POT R34 0603 R37 1206 SGND R39 TP41 SGND TP74 H53 AL CONTROL SELECT Adaptive Loop operating mode using PRM® and VTM® Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in following illustration. ON OFF Postion number PRM and VTM ADAPTIVE LOOP 1 2 3 4 5 6 7 8 9 10 For use when VTM evaluation board is connected to PRM evaluation board.
PAGE 22
The following table describes the switch configuration. Table 6. Switch configuration in local sensing Switch Position Number ON or OFF Connection 1 ON 2 TRIM pin is shorted to GND and PRM is configured for Remote Sense Operating mode. ON CONTROL NODE pin is connected to output of external error amplifier. 3 ON IFB pin is connected to output of external current sense amplifier to set constant current limit.
PAGE 23
Remote Sense operating mode using PRM® and VTM®: non-isolated remote sensing (differential sensing) Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in the following illustration. ON OFF Postion number REMOTE SENSE (Differential) 1 2 3 4 5 6 7 8 9 10 Note: To use this configuration, the VTM isolation must be broken by tying VTM -IN and VTM -OUT together. The following table describes the switch configuration. Table 7.
PAGE 24
In this configuration, the PRM® and VTM® evaluation boards are connected together to form a PRM / VTM pair and regulation is performed at the VTM module output. The +SENSE and -SENSE connections are made at the VTM output through connector J10. This is a non-isolated configuration and therefore the VTM isolation must be broken by tying the VTM -OUT and VTM -IN pins together. The VTM evaluation board has provisions for easily breaking the isolation.
PAGE 25
Trim and soft-start adjustment in Remote Sense Operation Trim and soft start adjustment in Remote Sense Operation is set by the reference voltage network shown below. The PRM evaluation board is normally configured for a 20 V to 55 V trim range. Trim POT R44 is used to trim the output voltage in Remote Sense Operation. The slew rate of the output voltage during startup may be controlled by controlling the rate-of-rise of the voltage at VREF node. This can be achieved using soft-start capacitance C24.
PAGE 26
Slave operating mode (Arrays) Mode select switch S10 setting: keep the switch S10 setting at all positions as shown in following illustration. Slave configuration for Adaptive Loop Master. Master/Slave configured PRM parallel arrays ON OFF Postion number Slave configuration for Remote Sense Operation.
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Figure 16. Paralleling of PRM evaluation board Top - Master Bottom - Slaves Interconnect signals Conclusion The PRM® evaluation board is a flexible tool which allows users to implement and perform basic testing on various configurations, including PRM-VTM® module combinations. This user guide covers some basic topics; however, it cannot describe every scenario. If additional information required, please contact Vicor Applications Engineering. The Power Behind Performance Rev 1.3 08/14 vicorpower.