EPower

EPower module (top view)

EPower module (bottom view)

Brief information

The EPower module replaces the original Enterprise power circuits.

Specification

The module has three power sources:

• 12 V @ 0.7 A,
• 5 V @ 1.5 A channel A,
• 5 V @ 1.5 A channel B.

The current limitation of the 5 V stabilizer is set at 3.7 A [I = 37125 / R1] (the maximum possible current is 7 A, if need, but it could damage the circuity of the computer).

Maximum values (limited by used components) are:

• 12 V @ 1.0 A,
• 5 V @ 2.3 A per channel (both 5A+5B @ 4.5 A).

This is much more than the original power source (12 V @ 0.15 A and 2x 5 V @ 1 A).

How to install

The author has made every effort to make the module as reliable and safe to use as possible. However,

You make any modifications inside of your equipment at your own risk !

What you need

• EPower module
• screwdriver
• soldering iron
• tin extractor
• solder tin
• pliers

Enterprise mainboard preparation

The following components should be desoldered from the motherboard:

C8 (100 µF) C9 (100 µF) C10 (100 µF) C11 (100 µF) C12 (100 µF) D2 (1N4001) D3 (1N4001) D4 (1N4001) L1 (coil) U19 (LM7805) U20 (LM7805) U21 (LM78L12) TR2 (BC337) TR3 (BC212) R13 (100 Ω) R14 (10 Ω) R15 (1.5 kΩ) R16 (3.9 kΩ)

Remove these components

Desoldered components

Prepared mainboard

Installing the module

The module pins are matched to holes left after the components: D2 (both holes), TR3 (ground), C8 (+9V), U21 (output +12V). The holes in which the module is installed should be very carefully cleaned of tin residues. Especially the holes after the transistor TR3 and the U21 chip due to their smaller diameter. Do not force the pins. Despite careful assembly, it is possible to slightly tilt the pins from the vertical. They should be corrected if necessary. The position of the pins is very precisely matched and the module should be allow gently slide into place. When soldering, make sure that the module adheres to the main board (up to the height of pin spacers). After assembly, cut out the excess of tips with a pair of pliers. The main stabilizer is intentionally undercut to allow the existing heat sink to be screwed.

Module fitting

Cut the excess of pins

Installed EPower module

How to make the EPower

Scheme

PCB

• Gerber files [EPower.gbr.zip]

Bill of materials (BOM)

RefDes	Name	Value
+9	TESTPOINT
+12	TESTPOINT
+5A	TESTPOINT
+5B	TESTPOINT
0V	TESTPOINT
C1	CAP_0805	10 nF
C2	CAP200RP	220 µF / 25 V
C3	CAP200RP	15..22 µF / 25 V
C4	CAP200RP	15..22 µF / 25 V
C5	CAP200RP	15..22 µF / 25 V
C6	CAP_0805	470 nF
C7	CAP_0805	1 nF
C8	CAP200RP	180..220 µF / 10 V (low ESR)
C9	CAP200RP	180..220 µF / 10 V (low ESR)
C10	CAP200RP	220 µF / 25 V (low ESR)
C11	CAP200RP	220 µF / 10 V
C12	CAP_0805	100 nF
C13	CAP_0805	330 nF
D1	C3D08060G	6 A Schottky diode
D2	S1A	1 A universal diode
D3	S1A	1 A universal diode
D4	SK110	1 A Schottky diode
E1	EMIFIL	MURATA NFM21PC475B1A3D
E2	EMIFIL	MURATA NFM21PC475B1A3D
E3	EMIFIL	MURATA NFM21PC104R1E3D
L1	DE_1207	22 µH @ 4.7 A
L2	DE_0704	22 µH @ 2.3 A
L3	DE_0704	22 µH @ 2.3 A
L4	DE_0704	15 µH @ 1.4 A
L5	DE_0704	15 µH @ 1.4 A
R1	RES_0805	10 kΩ (current output limiter)
R2	RES_0805	3 kΩ
U1	LM2679T-5
U2	LM2585S-12

Links

Thread on the Enterprise Forever forum Enterprise Power module - EPower

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