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Diamond Point International

MEN Mikro PU6 - 3U compactPCI 12 HP Power Supply Unit PSU, 24 VDC, 100 W

H15 DIN 41612 plug, -40 to +85°C Screened

MEN Mikro PU6 - 3U cPCI 12 HP PSU, 24 VDC, 100 W
Key Features
19" rack mountable (VMEbus, CompactPCI®)
3U, 12 HP, conformal coating
Input 24 VDC nom. (16.8..30 V)
Max. input voltage range 14.4..33.6 V (EN 50155)
Output 3.3 V, 5 V, 12 V, power 100 W
H15 DIN 41612 plug connector (front and rear)
-40 to +85°C screened
Complies with EN 50155 (railways)


MEN Mikro's PU6 is a plug-in power supply unit for 19" systems (e.g. VMEbus, CompactPCI®) and is especially designed for computer systems in public transport vehicles, being fully compliant with EN 50155.

The PU6 has a nominal input voltage of 24 VDC with a wide input range of 16.8..30 V and a max. input voltage range of 14.4..33.6 V (according to EN50155). The otherwise identical PSU models PU5 and PU8 are available for the nominal input voltages of 110 VDC and 36 VDC respectively.

It is controlled by a microprocessor which supervises the voltage and the temperature as well as one external input (for its key input function) and one output.

Thanks to the onboard intelligence the PSU can also act as an SMBus slave and communicate with the CPU board via the backplane. This allows the PSU to power on the system at a programmed date and enables the CPU to make status polls with regard to, e.g., error messages, time-out or on/off.

The PSU provides a DC/DC converter to generate the isolated 12 V from the input voltage. Two regulators generate 5 V and 3.3 V from the 12 V isolated side. The maximum power at full load is 100 W, minimum power is 5 W. The microprocessor is supplied with power independently and can turn off the main DC/DC converter to switch the unit into standby mode (power consumption less than 2 W).

The subassembly is conformally coated, and components are secured against vibration. The PSU operates in -40 to +85°C environmental temperature. The thermal stress is extremely low due to integrated heat sinks and diversion of dissipated heat over the mounting surface


Power Supply

InputNominal voltage input: 24 VDC
Wide input range: 0.7 x nominal voltage < nominal voltage < 1.25 x nominal voltage (according to EN50155): 16.8..30 VDC
Max. input voltage range: 0.6 x nominal voltage < nominal voltage < 1.4 x nominal voltage with full functionality for 0.1 s, no damage for 1 s (according to EN50155): 14.4..33.6 VDC
No load input power: < 1.6 W in standby mode
Output(s)Output power (max.): 100W
Output power (min.): 5W
12V tolerance/overvoltage protection: ±5%
5V tolerance/overvoltage protection: +5%/-3%
3.3V tolerance/overvoltage protection: ±3%
Overtemperature shutdown: 50°..90°(adjustable by SMBus command)
Holdup time according to EN50155 Class S2
IsolationIsolation (according to EN50155)
• Input/output: 1500VDC/1000V eff
• Input/shield: 1500VDC/1000V eff
• Output/shield: 1500VDC/1000V eff
• Ground/shield: 1500VDC/1000V eff
• Output voltage and temperature supervision (readable via SMBus)
• Overtemperature and overvoltage shutdown
• Communication with CPU
• Watchdog functionality
• Independent power supply for operation during standby mode (power consumption less than 1 W)
• Signals on back connector
• Voltage level 3.3 V
• Controlled by CPU
• Communication between the power supply unit and the CPU

1 binary input
• Voltage level according to external power supply input voltage (max. 154 VDC)
• Electrically isolated
• External switch (key) with binary input
• Switch-on by key input or wake on time
• Switch-off by key input or software
• Status of binary inputs readable via SMBus

1 binary output
• Voltage level according to external power supply input voltage
• Isolated by relays
• User-specific functionality (controllable via SMBus)
• Maximum switching power: 60W (example 110V/0.5A)

DC/DC Converter
• Fuse-protected

Two status LEDs on front panel
• Green LED indicates correct input voltage
• Yellow LED indicates correct output voltage

Alternative power supply at the backplane for use as redundant PSU
Short circuit protection
Reverse polarity protection by internal protector


ElectricalSee above
MechanicalDimensions: 3U, 12HP, 128.4mm height
Integrated heat sink
Conformal CoatingAs standard
SoftwareDriver software for SMB communication for Windows®, Linux, VxWorks®
TemperatureTemperature range (operation): -40..+85°C (no derating)
Temperature range (storage): -40..+85°C
Airflow: min. 10m³/h

• Class of protection: Class II, EN 60950
• Degree of protection: IP20 (insert in rack), EN60529
Weight1.1 kg
VibrationVibration: according to EN 60068-2-6
ShockShock: according to EN 60068-2-27
Continuous shock: according to EN 60068-2-29
MTBF190,000+ h @ 40°C according to IEC/TR 62380 (RDF 2000)
EMCTested according to EN 55022 (radio disturbance), EN 61000-4-2 (ESD), EN 61000-4-4 (burst) and EN 61000-4-5 (surge)
Warranty2 Years

Ordering Details

12HP, 100W, wide range input 24 VDC (16.8..30.0 VDC typ. and 14.4..33.6 VDC for 0.1sec), 12V, 5V and 3.3V output, -40..+85°C screened, conformal coating
12HP, 77..137.5 VDC (110 V nom.), 100 W, coated, -40..+85°C screened