ECPE 5 - 5v Regulated Power Supply

Rev. C

J. Dunmire
January 26, 2003

Introduction

This power supply is part of a series of labs associated with ECPE-5 course at the University of the Pacific. The course is designed and taught by Dr. Richard Turpin.

This power supply was designed with the following goals in mind:

The circuit is similar to a prototype circuit built on wireless bread-boards in a prior lab.
Assembly of this power supply will serve as an introductory soldering lesson.
This power supply will be used with a Microchip 16F877 experimental board in a later lab.

Description

The ECPE 5 Power supply is a simple 5 volt linear power supply based on the LM7805 regulator. A bridge rectifier is included to allow AC or DC input. Connectors and wire pads are included for both input and output.

The circuit and PCB board were designed using the ExpressPCB software.

The parts list and cost estimates are in the Excel file: Costed_BOM.xls.

Actual size: 1.0 inch x 1.5 inch

Input voltage range: 8 - 35 VDC or 8 - 24 VAC RMS

Output voltage: 5v DC, 1 amp Max. (The LM7805 will require a heat sink for high current, or large input voltages.)

Connections:
J1 - Input power, 2.5mm power jack
J2 - Input power, wires or 2.5mm pin header
J3 - Output Power, 3pin side entry connector for PCB to PCB connection
Pin 1 - GND
Pin 2 - +5v
Pin 3 - GND
J4 - Output Power, up to 18 gauge wire

Associated documentation:

The .sch and .pcb files require ExpressPCB and the .pdf files require an Acrobat viewer.

5vPwrSupply.sch - schematic diagram (in PDF format).
PwrSupply_1.pcb - PCB layout (ExpressPCB format).
PwrSupply_4.pcb - Four PwrSupply_1.pcb layouts combined on a single PCB panel. (ExpressPCB format)
Costed_BOM- parts list and estimated costs. All parts are available from Digikey. (Excel file)
LM7805_M78xx-MC78xxA.pdf - data sheet for the LM7805
rapc712_cd.pdf - data sheet for the 2.5mm power jack (J1).
022162020_sd.pdf - data sheet for the side entry, output power connector (J3).
022052031_sd.pdf - data sheet for a pin header that mates with J3. (Reference only.)
ee080_ee8_fc_dne.pdf - data sheet for the 47uF capacitor. Note that the hole spacing on the PCB is larger than required for the 47uF capacitor. This is to allow larger value capacitors, or capacitors from alternative vendors. The assumption is that is easier to fit a component into holes that are spaced too far apart than it is to fit them in holes that are too close together.
df005m.pdf - data sheet for the rectifier.
mID_4594_cID_3568_monokap.pdf - data sheet for the 1uF capacitor.

Note: All data sheets were obtained from online documentation at www.digikey.com.

$Date: 2008-10-21 19:17:35 $
$Source: /home/cvsroot/projectsTop/linear5vPwrSply/ECPE5_Power_Supply.html,v $

Contact me by email: jedunmire at gmail.com