Vaisala MWP312 Use and care manual

DC Power Supply
MWP312
TECHNICAL
REFERENCE
M210644EN-B
August 2005

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2005
No part of this manual may be reproduced in any form or by any means,
electronic or mechanical (including photocopying), nor may its contents be
communicated to a third party without prior written permission of the copyright
holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or
Conditions of Sale.

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VAISALA ________________________________________________________________________ 1
Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................ 3
About This Manual ................................................................... 3
Contents of This Manual ....................................................... 3
Feedback............................................................................... 3
Safety......................................................................................... 4
General Safety Considerations ............................................. 4
ESD Protection...................................................................... 4
Recycling .................................................................................. 5
CHAPTER 2
PRODUCT OVERVIEW.................................................................................. 7
Overview ................................................................................... 7
CHAPTER 3
FUNCTIONAL DESCRIPTION....................................................................... 9
Power Input............................................................................... 9
Control Logic ............................................................................ 9
Standby Regulator ................................................................. 10
Output Switch ......................................................................... 10
Power Indicators .................................................................... 10
Power Up................................................................................. 10
Controlled Shut Down............................................................ 11
Temperature Monitor ............................................................. 11
CHAPTER 4
TECHNICAL DATA ...................................................................................... 13
Technical Specifications ....................................................... 13
I/O Connectors........................................................................ 14
Power Control Connector.................................................... 14
System Connector.................................................................. 14
CHAPTER 5
PARTS LIST ................................................................................................. 15
APPENDIX A
DIAGRAMS AND BOARD LAYOUTS......................................................... 19

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Chapter 1 ________________________________________________________ General Information
VAISALA ________________________________________________________________________ 3
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the product.
About This Manual
This manual provides information for the Vaisala DC Power Supply
MWP312.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the
product.
- Chapter 2, Product Overview, explains the operation and basic
structure of the Vaisala DC Power Supply MWP312.
- Chapter 3, Functional Description, describes the functionality of
the product.
- Chapter 4, Technical Data, provides the technical data of MWP312.
- Chapter 5, Parts List, lists the MWP312 parts.
- Appendix A, Diagrams and Board Layouts.
Feedback
Vaisala Customer Documentation Team welcomes your comments
and suggestions on the quality and usefulness of this publication. If
you find errors or have other suggestions for improvement, please

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indicate the chapter, section, and page number. You can send
comments to us by e-mail: [email protected]
Safety
General Safety Considerations
Throughout the manual, important safety considerations are
highlighted as follows:
WARNING Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or
even death.
CAUTION Caution warns you of a potential hazard. If you do not read and
follow instructions carefully at this point, the product could be
damaged or important data could be lost.
NOTE Note highlights important information on using the product.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage
to electronic circuits. Vaisala products are adequately protected
against ESD for their intended use. However, it is possible to damage
the product by delivering electrostatic discharges when touching,
removing, or inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground
yourself to the equipment chassis before touching the boards.
Ground yourself with a wrist strap and a resistive connection cord.
When neither of the above is possible, touch a conductive part of

Chapter 1 ________________________________________________________ General Information
VAISALA ________________________________________________________________________ 5
the equipment chassis with your other hand before touching the
boards.
- Always hold the boards by the edges and avoid touching the
component contacts.
Recycling
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations.
Do not dispose of with regular household refuse.

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Chapter 2 __________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 7
CHAPTER 2
PRODUCT OVERVIEW
This chapter explains the operation and basic structure of the Vaisala
DC Power Supply MWP312.
Overview
The Power Supply MWP312 is an E1-sized plug-in system power
unit. The MWP312 connects to the motherboard through a 32-pin
Euroconnector and provides DC operating voltages for the system.
The input power is a 24 V DC voltage . The regulated output voltages
+3.3 V, +5 V, +7 V, +12 V and –12 V DC are fed to the
Euroconnector. The input power connection is floating and the output
voltages are short-circuit protected.
MWP312 automatically enters Standby state when the input power is
connected. In this state, only +5 V internal DC voltage is on and a +5
V standby voltage for low power external use is available. All other
DC/DC converters are disabled and the +5 V power switch is off.
The system power on/off is controlled by logic signals. Two
alternative control methods are provided: direct on/off control with
separate on and off control signals; or alternating control with a single
on/off (toggle) control line. The control signals are available in the
Euroconnector and in the front panel Power Control connector. LED
lamps for all DC output voltages are provided for monitoring
purposes.

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Chapter 3 ______________________________________________________ Functional Description
VAISALA ________________________________________________________________________ 9
CHAPTER 3
FUNCTIONAL DESCRIPTION
This chapter describes the functionality of the product.
Power Input
The external input power from the Euroconnector is connected
through fuse F1 and filter Z1 to the capacitor C11, C12 and C1. From
capacitor C1, the input power is further connected through filter choke
L1 and capacitor C2 to the power input of DC/DC converters A1, A2,
A3, and A4. The DC/DC converters provide isolated power outputs
+3.3 V, +5 V, +7 V and ±12 V.
The fuse F1 and tranzorb diode V10 are protecting the unit against
overvoltages. Short voltage spikes are damped without damaging the
unit, longer overvoltage periods may burn the fuse and/or damage the
V10. A reverse polarity at the power input will burn the fuse.
Control Logic
The PLD circuit D1 controls the state of the power unit. During
power-up the reset controller A8 keeps the reset signal input (D1/31)
active and the D1 enters power-off (standby) state where only internal
+5V voltage and +5VSTBY output voltage are on.
The control inputs PON#, POFF# , PTOGGLE# and MPUPON# are
used to set the supply in power-on or in standby state. The signal
PON# switches the power on. The signal POFF# switches the power
off. The signal PTOGGLE# is used to change the state of the supply.
The MPUON# signal is optionally used for delayed power off (see
chapter Controlled Shut Down).

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The output signal at pins 34 and 35 of D1 is used to control the A2,
A3 and A4 DC/DC converters. The high-level output signal switches
the converters on by feeding current to the optocoupler V21 which
turns V21 collector voltage at low level. This further turns off the
transistor V22 and enables the DC/DC converters A2 and A3 and
turns on the FET V23 which feeds the input voltage to the -12 V
DC/DC converter. Converter A3 output +12 V is further used to
control the +5V power switch and as power input for +7V DC/DC
converter A6.
Standby Regulator
The linear voltage regulator A5 is used as 400 mA current limiter in
the +5 VSTBY output.
Output Switch
The N-channel FET transistors V7 and V8 are used to connect +5 V
output voltage on/off. Two 13.5 milliohm devices in parallel are used
to keep the worst case on-state voltage loss below 40 mV.
The +12 V output voltage is used to control the +5V output switch V7
and V8. The +12 V switches the +5V power on by turnig the gate
voltage of FET transistors at high level via operational amplifier A7.
Gate voltage is not switched high if the +12V voltage is below +8V.
Power Indicators
The output voltages are monitored by comparator circuits A9, A10
and A11. When a voltage falls below 80 % of its nominal value the
output of the comparator changes state to indicate low voltage
condition. The comparator outputs are connected to the PLD circuit
D1 which turns the corresponding indicator LED to red by switching
off the green LED in a bi-color lamp. At the same blinking control is
activated at control signal RED (Power control connector X2 pin 6)
for external indication of the power fault condition.
Power Up
At power-up D1 sets the GRN control output (X2/1) blinking until the
low drive of STATUS# input signal (X1/c12) is released by all

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VAISALA _______________________________________________________________________ 11
external system units. A unit typically releases the common
STATUS# line when its power-up test routines are completed
successfully.
If STATUS# remains active by more than 6 minutes the D1 turns the
RED control on to indicate that at least one system unit has failed in
power-up procedure.
Controlled Shut Down
The signal MPUON# (X1/a4) is used for controlled shut down if the
system includes optional embedded PC computer. In that case when
the PTOGGLE# control is activated the active MPUPON# signal
delays power off until the computer is completed its shutdown
operations and releases the MPUPON# control. The delayed power off
period is indicated by blinking GRN control for external status
indicator.
Temperature Monitor
The unit includes a temperature monitor circuit for overtemperature
warning and shut down features. The circuit consists of temperature
sensing NTC resistor R57, fixed resistor R24, capacitor C29, inverter
gate D3-F and 3-state buffers D4,D5. In operation the PLD D1
alternatively connects NTC resistor and fixed resistor R24 as feedback
resistor for the RC oscillator and calculates the unit temperature by
comparing the oscillator frequencies.
When temperature rises over +70 °C a temperature warning is given
by blinking the RED control for external indicator.
At temperatures over +90 °C a temperature shut down to the standby
state is performed and the RED control for external indicator is set.

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Chapter 4 ____________________________________________________________ Technical Data
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CHAPTER 4
TECHNICAL DATA
This chapter provides the technical data of MWP312.
Technical Specifications
Table 1 MWP312 Technical Specifications
Property Value / Description
Nominal Input Voltage 24 V
Input Voltage Range 18 .... 36 V
Typical Input Current 2.7 A, Vin 24 V (50 W load)
3.6 A, Vin 18 V (50 W load)
Outputs +3.3 V (3.1… 3.4 V) / 7 A
+5 V (4.75 ... 5.25 V) / 5 A
+7 V (6.7 … 7.2V) / 1 A
+12 V (11.0 ... 13.0) / 1 A
–12 V (–11.0 ... –13.0) / 0.1 A
+5 V stby (4.25 ... 5.25) / 0.4 A
Operating Temperature –30 ....+55°C
Storage Temperature –55 ....+70°C
Humidity non-condensing
Dimensions (height, depth, width) 100 mm ×160 mm ×20 mm
Weight 0.4 kg

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I/O Connectors
Power Control Connector
Connector: 9-pin female D
Mating cable connector: 9-pin male D
Table 2 Power Control Connectors
Pin Signal Description
1 GRN Power on indicator output
2 RACK0 Rack code LSB
3 RACK1 Rack code MSB
4 POFF# Power off control input
5 GND Ground
6 RED Error indicator output
7 PON# Power on control input
8 YEL Stanby power indicator output
9 PTOGGLE# Power toggle control input
System Connector
Connector: 32-pin, 2-row male power Euroconnector
Mating connector: 32-pin, 2-row female power Euroconnector
Table 3 System Connectors
Row A Row CPin
Signal Description Signal Description
2 GND Ground GND Ground
4 MPUPON# Power control input from
MPU-unit
POFF# Power off control input
6 PON# Power on control input PTOGGLE# Power toggle control input
8 RACK0 Rack code LSB RACK1 Rack code MSB
10 +V Input Power + +V Input Power +
12 STATUS# Status indicator input
14 –V Input Power – –V Input Power –
16 +5VSTBY +5 V standby voltage +5VSTBY +5 V standby voltage
18 +3.3V +3.3 V DC power +3.3V +3.3 V DC power
20 +3.3V +3.3 V DC power +5V +5 V DC power
22 +5V +5 V DC power +5V +5 V DC power
24 +7V +7 V DC power +7V +7 V DC power
26 +12V +12 V DC power +12V +12 V DC power
28 –12V –12 V DC power –12V –12 V DC power
30 GND Ground GND Ground
32 GND Ground GND Ground

Chapter 5 _________________________________________________________________Parts List
VAISALA _______________________________________________________________________ 15
CHAPTER 5
PARTS LIST
This chapter lists the MWP312 parts.
Table 4 MWP312 Parts List
Part No. Code Description Qty
Chassis
DRW212800 Front Panel Assembly for MWP312 1
DRW212802 Front Panel, Machined, for MWP312 -
PCB210230(B) Printed Circuit Board for MWP312 1
DRW212802 Heat Sink for MWP311 1
Integrated Circuits
A1 210846 Converter, DC/DC, QS075YG-A 1
A2 210845 Converter, DC/DC, QS050YE-A 1
A3 210847 Converter, DC/DC, QS100YH-A 1
A4 210300 Converter, DC/DC, TEP-2412 1
A4 16730 IC, Op.Amp., TL082ID (SMD) 1
A5 19991 IC, Voltage Regulator, MIC2920A-5.0BS 1
A6 25073 IC, Voltage Regulator LM2672-ADJ 1
A8 25330 IC, Supervisor, MAX810TEUR-T (SMD) 1
A9, A10, A11 19784 IC, Comparator, LTC1442IS8(SMD) 3
D1 25771 IC, EPM7064STC44-10 (SMD) 1
D2,D3 15964 IC, Inverter, Ex, 74HC14 (SMD) 2
D4, D5 26570 IC, Buffer, NC7SZ125M5 (SMD) 2
Transistors and Diodes
V1, V2, V3, V4,V5,
V6
010192 Diode, LED, 591-3001 6
V7, V8, V23 25302 Transistor, FET, PHN1013 (SMD) 3
V9, V11, V14, V19,
V26, V27, V28, V31
17332 Diode, Transil, P6SMB6.8AT3 (SMD) 8
V10 17448 Diode, Transil, SMCJ43A, (SMD) 1
V12, V15, V29, V30 15976 Diode, Silicon, Ex, LL4148/PMLL4148 (SMD) 4
V13, V16, V24 17311 Diode, Transil, SM6T30CA (SMD) 3
V17 19241 Diode, Transil, SM6T15A (SMD) 1
V18 19463 Diode, Schottky, MBRS130LT3 (SMD) 1
V20, V25 25030 Diode, Transil, 1SMB18AT3 (SMD) 2
V21 16982 Optocoupler, Ex, TLP 181 (SMD) 1
V22 15495 Transistor, NPN, SST3904 SOT-23 1

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Part No. Code Description Qty
Resistors
R1, R8, R13, R22,
R39, R41, R42
18117 Resistor, Chip, 1k0 1% 100ppm 0805 7
R2, R9 18730 Resistor, Chip, 562R 1.0% 100ppm 0805
R3, R5, R34 19459 Resistor, Chip, 100R 0.5% 25ppm 0603 3
R4, R18, R20, R23,
R25, R29 R32, R36,
R40
25262 Resistor, Chip, 10k0 1% 100ppm 0603 9
R6 18683 Resistor, Chip, 464R 1.0% 100ppm 0805 1
R7 18683 Resistor, Chip, 274R 1% 100ppm 0805 1
R10, R11, R38 19710 Resistor, Chip, 22k0 5% 200ppm 0603 3
R12 18734 Resistor, Chip, 1k47 1% 50ppm 0805 1
R14, R17, R19,R27,
R33
18410 Resistor, Chip, 3k32 1% 50ppm 0805 5
R15, R16 18119 Resistor, Chip, 1k82 1% 100ppm 0805 2
R21 26126 Resistor, Chip, 4k75 0.5% 25ppm 0603 1
R24, R44, R45, R46,
R47, R51
25451 Resistor, Chip, 100k 1.0% 100ppm 0603 6
R26, R35 25169 Resistor, Chip, 15k0 1% 100ppm 0603 2
R30, R37 18120 Resistor, Chip, Ex, 2k0 1% 50ppm 0805 2
R30, R56 16416 Resistor, Chip, 270R 1% 50ppm 1206 1
R31, R55 25210 Resistor, Chip, 332R 1.0% 100ppm 0603 2
R37 16415 Resistor, Chip, 150R 1% 50ppm 1206 1
R43, R52 18797 Resistor, Chip, 221k 1% 50ppm 0805 2
R48 18888 Resistor, Chip, 121k 1% 50ppm 0805 1
R49 18604 Resistor, Chip, 332R 1% 50ppm 0805 1
R53 26125 Resistor, Chip, 61k9 1% 100ppm 0603 1
R54 18734 Resistor, Chip, 1k47 1% 50ppm 0805 1
R57 18857 Resistor, Chip, NTC,10k 5% B3630K 1206 1
Capacitors
C1, C2 19482 Cap., Electrolytic SMD, 220 µF 35 V 20% 2
C3,C4,C5, C6, C10,
C12, C13, C18, C20,
C22, C24, C25, C26
15621 Cap., Chip Ceramic, Ex, 100n 10% X7R 50V 0805 13
C7, C8, C11 16390 Cap., Chip Ceramic 2n2 3
C9, C19, C21,C28, 25560 Cap., Electrolytic SMD 100µF5
C14 15160 Cap., Chip Ceramic 10nF X7R 50V 0805 1
C16, C17, C23 25066 Cap., Chip Ceramic, Ex, 1000nF X5R 1206 3
C25, C29 18287S Cap, Chip Polyester, 47nF 5% 25V 1812 1
C27 15750 Cap., Chip Ceramic 330nF X7R 2220 1
C30
Filters and Chokes
Z1 16826 Filter, DC, BNX002-01 1
Z2 25036 Filter, EMI, NFM61R30T472 (SMD) 1
L1 26708 Choke, Power, 2.2uH 7.4A 0.011ohm 1
L2 16302 Choke, PICO42305 1
L3, L4, L5 19604 Choke, Power, 10uH 1.1A 0.14R (SMD) 3
Connectors
X1 1812 Connector, Euro, D032MS-C1A-0.8/5253 1
X2 19285 Connector, D, DEJK9S4-1A7N-146 1
X3 19640 Connector, horizontal (SMD) 2x8 0.1" 1
6014 Connector Accessory, D20418-2 2

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VAISALA _______________________________________________________________________ 17
Part No. Code Description Qty
Miscellaneous
F1 7048 Fuse,Glass Tube, 5.0AT 1
7028 Fuse Holder, 1611PR 1/12 OSA 1
211740 Hexag. Tapped Spacer 5,03. 13.53 M3-13.5 2
0840 Rivet, 2,5 x 9,9 /Ms/Tin 2
18574 Screw, Crosshead, M 3 x 6 /A4m 2
211738 Screw, Crosshead, M2.5 x 6 /A4 6
25015 Screw, Crosshead, M 3 x 8 /A4m 14
3939 Washer, Spring, B3 /A4 2
7067 Washer, Spring, B2.5 /A4 2

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