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Half-Chip PRM-RS Customer Evaluation Board User Guide
(For use with PCB part number 35307)
USER GUIDE | UG:008
Introduction 1
Features 2
Board Description 2
Schematic, Assembly and
Bill of Materials (BOM) 5
Schematic 5
Assembly Drawing 6
Bill of Materials 6
VTM Customer
Evaluation Boards 8
Recommended Equipment 10
Test Configurations 10
PRM
Stand-Alone Operation 10
PRM-VTM™ Operation,
Local Sense 11
PRM-VTM Operation, Non-
isolated Remote Sense 12
Test Procedure 14
Advanced Modifications 16
Conclusion 19
Contents Page The half-Chip PRM-RS customer evaluation board described in this document is designed for use with
the Remote-Sense (RS) family of half-chip PRMs, and demonstrates the benefits of Factorized Power
Architecture™. This evaluation board is not designed for installation in end-user equipment. The system
demonstrates the use of a PRM™ Regulator and a VTM™ Current Multiplier for general laboratory
evaluation only.
Please read this document before setting up a customer evauation board.
IMPORTANT NOTICE:
The User Guide is not comprehensive and is not a substitute for common sense and good
practice. For example:
1. When testing electronic products always use approved safety glasses.
2. Provide a strain relief for wires and place the system on the bench in such a way as to prevent
accidental dislodgment from the bench top.
3. Remove power and use caution when connecting and disconnecting test probes and interface lines
to avoid inadvertent short circuits and contact with hot surfaces.
4. Never use a jumper in place of the fuse. Replace the fuse only with its equivalent type and rating.
5. Never attempt to disconnect the evaluation board from a VTM customer evaluation board while
power is applied. This system is not designed to demonstrate hot plug capability.
Introduction
The half-Chip PRM-RS customer evaluation board can be used to demonstrate a stand-alone regulator
or in conjunction with a VTM customer evaluation board to enable demonstration of a Factorized Power
Architecture (FPA™) system. There are many combinations possible using PRM and VTM customer
evaluation boards, but the focus in this user guide is using one PRM customer evaluation board and one
VTM customer evaluation board. The half-chip PRM customer evaluation board can be configured for
local sensing (at the PRM output), or non-isolated remote sensing (at the VTM output). The half-chip
PRM customer evaluation board is nominally configured for local sensing where the voltage feedback
circuit regulates the output voltage of the PRM. Implementing remote sensing requires component
changes and rework to the board which is detailed in the PRM-VTM Operation section on page 12.
Part Numbers and Ratings
Refer to the specific PRM data sheet for ratings of the device. It is important to remain within the device
limits when testing.
Contents
The half-Chip PRM-RS customer evaluation board arrives with the following contents:
1. 1 x half-Chip PRM-RS customer evaluation board fully populated.
2. 1 x 11mm VI Chip
®
push-pin heat sink.
3. 2 x VI Chip push pins for heat sink installation.
4. 2 x VI Chip push-pin heat sink grounding clip.
5. 2 x 10 pin male-to-male headers.
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Features
The half-Chip PRM-RS customer evaluation board has the following features:
1. Input and output lugs for source and load connections
2. Input fuse (appropriately rated)
3. Input capacitor for source decoupling
4. Test points for access to various device pins and circuit voltages
5. Trim pot for adjusting the output voltage set point
6. Voltage regulation, and current-sensing circuitry appropriately set for proper operation
7. Recommended output filter inductor
8. Dual output headers (female) for transferring power and signal connections to downstream VTM™
customer evaluation board.
9. Switch for enabling / disabling the device through the PC pin
10. Oscilloscope probe jack for making accurate output voltage measurements
11. Provisions for installing custom VI Chip
®
push-pin heat sink with grounding clips
(optional, included with board)
Board Description
The following section provides a detailed description of the half-Chip PRM-RS customer evaluation
board components and test points.
Figure 1
Board description