PM400 – 400W Open Frame Medical Power Supply
- Technology
- Open / u-frame power supplies
- Partner
- FSP Protek
The PM400 series provides regulated AC-DC power for medical equipment, industrial systems, data networking and telecommunications applications. Its open-frame construction combines a printed circuit board with a U-bracket for mechanical support and heat dissipation. The standard U-bracket version supplies 300 W under convection cooling or 400 W when supported by 7 CFM forced airflow. An enclosed version with an integrated cover and fan assembly provides 400 W without changing the overall package dimensions. Seven output models cover nominal voltages from 12 V to 48 V, each with remote sensing and a ±2% output tolerance. BF class insulation, 2 MOPP input-to-output separation and controlled leakage current support integration into medical electrical equipment. Standby power, fan power and multiple logic signals are provided for system-level monitoring and control.
The PM400 series is designed for medical and other professional electronic systems that require a compact, regulated AC-DC power platform. It is offered in open-frame U-bracket and enclosed fan-cooled formats, giving designers flexibility in how cooling is implemented within the end equipment.
With seven nominal output options from 12 V to 48 V, the series supports a broad range of system power architectures. Medical-focused features such as BF class insulation, 2 MOPP isolation, low leakage current and dedicated control/status signals make the PM400 well suited to demanding equipment designs.
Range features
A high level overview of what this range offers
- 300 W convection or 400 W forced-air output – Allows the cooling arrangement to be matched to the available system airflow.
- Seven output-voltage options – Covers 12 V, 15 V, 18 V, 24 V, 28 V, 36 V and 48 V power architectures.
- 90–264 VAC input with active PFC – Supports operation from common single-phase mains supplies.
- BF class insulation – Supports medical equipment designs with relevant applied-part insulation requirements.
- 4000 VAC input-to-output withstand voltage – Provides 2 MOPP isolation between mains input and DC output.
- Earth leakage current up to 300 µA – Helps control leakage within medical power-system requirements.
- Remote sensing up to 0.5 V – Compensates for voltage losses in output cabling.
- Automatic short-circuit recovery – Restores operation after the fault condition is removed.
- Overvoltage and overtemperature protection – Protects the supply and connected equipment against specified abnormal conditions.
- 5 V standby output at 100 mA – Powers low-current monitoring and control circuits while the main output is managed separately.
- PFD, inhibit, DC OK and PS OFF signals – Supports power sequencing, status monitoring and remote output control.
- Operation at altitudes up to 5,000 m – Supports equipment intended for use at elevated locations.
- Class B conducted emissions – Assists EMC integration in medical, information technology and industrial equipment.
- U-bracket and enclosed configurations – Provides a choice between system-provided airflow and an integrated cover-and-fan assembly.
Downloads
for PM400 - 400W Open Frame Medical Power Supply
What’s in this range?
All the variants in the range and a comparison of what they offer
| Specification | PM400-12B | PM400-13B | PM400-13-1B | PM400-14B | PM400-15B | PM400-17B | PM400-18B |
|---|---|---|---|---|---|---|---|
Nominal output voltage | 12 V | 15 V | 18 V | 24 V | 28 V | 36 V | 48 V |
Minimum current | 0.1 A | 0.1 A | 0.1 A | 0.1 A | 0.1 A | 0.1 A | 0.1 A |
Maximum current, convection cooling | 25.00 A | 20.00 A | 16.67 A | 12.50 A | 10.72 A | 8.34 A | 6.25 A |
Maximum current with 7 CFM airflow | 33.34 A | 26.67 A | 22.23 A | 16.67 A | 14.29 A | 11.12 A | 8.34 A |
Output tolerance | ±2% | ±2% | ±2% | ±2% | ±2% | ±2% | ±2% |
Ripple and noise | 120 mV | 150 mV | 180 mV | 240 mV | 280 mV | 360 mV | 480 mV |
Maximum output power, convection/forced air | 300 W/400 W | 300 W/400 W | 300 W/400 W | 300 W/400 W | 300 W/400 W | 300 W/400 W | 300 W/400 W |
Typical efficiency at 115/230 VAC | 90%/92% | 90%/92% | 91%/92% | 89%/91% | 89%/91% | 90%/92% | 90%/93% |
| Input Specification | Value |
|---|---|
Rated input-voltage range | 90–264 VAC |
Input frequency | 47–63 Hz |
Input current at 115 VAC, 60 Hz | 4.2 A RMS |
Input current at 230 VAC, 50 Hz | 2.1 A RMS |
Earth leakage current | 300 µA maximum at 264 VAC, 63 Hz |
Touch current | 100 µA maximum at 264 VAC, 63 Hz |
Power-factor correction | Active PFC |
| Output and Protection Specification | Value |
|---|---|
Ripple and noise limit | 1% peak-to-peak maximum |
Remote-sense compensation | Up to 0.5 V cable-loss compensation |
Overvoltage protection | 115–140% of nominal output; automatic recovery |
Short-circuit protection | Automatic recovery |
Overtemperature protection | Latching; input power must be recycled to reset |
Temperature coefficient | ±0.04%/°C maximum for all outputs |
Transient response | Maximum 4% excursion, recovering to within 1% of the final value in 500 µs after a 25% step-load change |
Standby output | 5 V at 100 mA maximum |
Fan supply output | 12 V at 250 mA maximum |
No-load operation | Permitted without damage; output may fluctuate beyond 5% during burst-mode operation |
| General and Environmental Specification | Value |
|---|---|
Package size | 4 × 7 × 1.58 in |
Switching frequency | 20–535 kHz |
General typical efficiency | 89% at 115 VAC; 92% at 230 VAC |
Hold-up time | 12 ms minimum at 110 VAC and 400 W |
Line regulation | ±0.5% maximum at full load |
Inrush current | 20 A at 115 VAC or 40 A at 230 VAC, at 25°C cold start |
Input-to-output withstand voltage | 4000 VAC, 2 MOPP |
Input-to-ground withstand voltage | 1500 VAC, 1 MOPP |
Output-to-ground withstand voltage | 1500 VAC |
Calculated MTBF | 250,000 hours at full load and 25°C ambient, calculated to MIL-HDBK-217F |
Operating temperature | −10°C to +70°C |
Storage temperature | −40°C to +85°C |
Relative humidity | 5–95%, non-condensing |
Temperature derating | 100% at +50°C, reducing linearly to 50% at +70°C for convection and forced-air operation |
Maximum operating altitude | 5,000 m |
U-bracket weight | Approximately 1.0 kg |
Enclosed-form weight | Approximately 1.14 kg |
Maximum fixing-screw penetration | 4 mm from the outer chassis surface |
| Safety and EMC | Value |
|---|---|
Medical safety | UL ES 60601-1, CSA C22.2 No. 60601-1 and TÜV EN 60601-1 |
Safety file number | E178020 |
ITE safety | UL 62368-1, CSA C22.2 No. 62368-1 and TÜV EN 62368-1 |
Insulation classification | BF class |
Conducted emissions | EN 55011 and EN 55032 Class B |
Radiated emissions | Class A |
Harmonic current | EN 61000-3-2, Classes A and D |
Voltage fluctuations and flicker | EN 61000-3-3 |
Medical EMC and multimedia immunity | EN 60601-1-2 and EN 55035 |
Electrostatic discharge | ±15 kV air and ±8 kV contact |
Radiated immunity | 9–28 V/m |
Electrical fast transient/burst | ±2 kV |
Surge immunity | ±1 kV differential mode and ±2 kV common mode |
Conducted immunity | 10 Vrms |
Power-frequency magnetic field | 30 A/m |
Voltage-dip immunity | 30% reduction for 500 ms and 100% reduction for 10 ms |
Environmental compliance | RoHS requirements |
| Interface Signal | Function |
|---|---|
PFD | TTL high during normal operation and TTL low following loss of input power; changes state at least 1 ms before the main output falls 5% below nominal |
Inhibit | TTL low disables the main output |
DC OK | TTL high when the output voltage exceeds 95% of nominal |
PS OFF | TTL high disables the main output |
| Connections and Form Option | Specification |
|---|---|
B suffix | U-bracket form; 300 W convection cooled or 400 W with 7 CFM user-provided airflow |
C suffix | Enclosed form with cover and fan assembly; rated for 400 W |
Input connector P1 | Three-position terminal with ground, live and neutral connections |
Main output connections P2/P3 | M4 × 0.7 screw connections for positive output and common return |
Control connector P4 | Eight-pin connection for common return, inhibit, positive sense, 5 V standby, negative sense, DC OK, PFD and PS OFF |
Fan connector P5 | Two-pin connection providing 12 V fan power and common return |
FAQs
for PM400 – 400W Open Frame Medical Power Supply
The U-bracket version is rated for up to 300 W under convection cooling. Output power can reach 400 W when the system provides 7 CFM forced airflow and the stated temperature-derating requirements are observed.
The B suffix identifies the U-bracket version, which relies on the host equipment for any required forced airflow. Replacing the suffix with C identifies the enclosed version fitted with a cover and fan assembly for 400 W operation.
The series includes 12 V, 15 V, 18 V, 24 V, 28 V, 36 V and 48 V models. Maximum output current depends on the selected voltage and cooling method.
Yes. All variants can operate at no load without damage, although the output voltage may fluctuate by more than 5% because the control circuit enters burst mode to reduce energy consumption.
Full rated power is available up to an ambient temperature of +50°C under the applicable cooling conditions. The available power must then be reduced linearly to 50% at +70°C.
The PM400 uses BF class insulation and provides 4000 VAC input-to-output withstand voltage, corresponding to 2 MOPP. Input-to-ground isolation is rated at 1500 VAC and 1 MOPP.
The power supply includes overvoltage, short-circuit and overtemperature protection. Overvoltage and short-circuit conditions recover automatically, while an overtemperature shutdown requires the AC input to be recycled.
The remote-sense input can compensate for up to 0.5 V of voltage drop between the power supply and the load. Sense wiring should be routed and connected in accordance with the final equipment design requirements.
The eight-pin control connector includes inhibit, DC OK, power-fail detection and PS OFF signals. It also carries remote-sense connections, a 5 V standby output and a common return.
No. The 400 W rating depends on the specified cooling arrangement and applies without derating only up to +50°C. Available output power decreases linearly above this temperature and reaches 50% at +70°C.
