3.0" x 5.0" x 1.44" (76.2mm x 127mm x 35.2mm) nominal
Outside Dimensions
0.352/0.78
Weight (typ.)
1
Planned submission, contact Murata for additional details
2
3000 M max. altitude for Medical applications
3
when deployed in End User Systems
PROTECTION CHARACTERISTICS
Parameter
Over Voltage Protection
Over Current Protection
Over Temperature Protection
(Primary and Secondary Heatskink Temperature)
Remote Sense Short Circuit Protection
Remote Sense Reverse Connection Protection
Conditions
V1 (main output) latching
V2 (aux output) latching
V1, hiccup mode
V1, latch mode
V2, auto-recovery
Auto-recovery
Min.
115
5.5
120
160
110
125
Typ.
Max.
140
7.5
150
Short circuit
150
130
Units
%
V
%Amax
°C
Complies
Complies
Min.
1500
4000
1500
1500
Typ.
Max.
Units
V
AC
300
150
µA
µA
ISOLATION CHARACTERISTICS
Parameter
Isolation
Earth Leakage Current (under single fault condition)
Earth Leakage Current (under normal conditions)
Conditions
Primary to Chassis
Primary to Secondary (2xMOPP)
Secondary to Chassis
Output to Output
264V
AC
, 60Hz, 25°C
264V
AC
, 60Hz, 25°C
www.murata-ps.com/support
PQC250.A13 Page 2 of 8
PQC250 Series
250W 3" x 5" Convection Cooled AC-DC Power Supply
CURRENT SHARING OPTION – PQC250-XX-DXX
Model Number
PQC250-XX-Dxx
Refer to
ACAN-78
for additional
details
Description
Main Output current share is achieved using “the droop method”. Nominal output voltage is achieved at 50% load and output voltage increases/decreases
approximately ±3% of nominal voltage. This regulation window does not include the additional tolerance due to line, temperature, long term stability etc.
Startup of parallel power supplies is not internally synchronized. If more than 250W combined power is needed, start-up synchronization must be provided
by system using a common PS_ON signal. To account for ±10% full load current sharing accuracy and the reduction in full load output voltage due to
droop, available output power must be derated by 15% when units are operated in parallel. Current sharing can be achieved with or without remote sense
connected to the common load.
ORing protection is available on the PQC250-xxDRT models (see Application notes,
ACAN-78
for additional details);
Aux (V2) output can be tied together for redundancy but total combined output power must not exceed 2.5W, external ORing devices are recommended to
preserve redundancy.
EMISSIONS AND IMMUNITY
Characteristic
Input Current Harmonics
Voltage Fluctuation and Flicker
Conducted Emissions
Radiated Emissions
ESD Immunity
Radiated Field Immunity
Electrical Fast Transient Immunity
Surge Immunity
Radiated Field Conducted Immunity
Magnetic Field Immunity
Voltage dips, interruptions
Standard
IEC/EN 61000-3-2
IEC/EN 61000-3-3
EN 55022
FCC Part 15
CISPR 22 -3 meter
FCC 15.109 - 3 meter
IEC/EN 61000-4-2
IEC/EN 61000-4-3
IEC/EN 61000-4-4
IEC/EN 61000-4-5
IEC/EN 61000-4-6
IEC/EN 61000-4-8
IEC/EN 61000-4-11
Compliance
Class A
Complies
Class B
Class B
Class B
Class B
Level 4, Criterion 2
Level 3, Criterion A
Level 4, Criterion A
Level 3, Criterion A (Com. Mode: 2kV 12 OHM, Diff.
Mode: 1kV, 2 OHM)
Level 3, 10V/m, Criterion A
Level 3, Criterion A
Level 3, Criterion B
EMI CONSIDERATIONS
For optimum EMI performance, the power supply should be mounted to a metal plate grounded to all 4 mounting holes of the power supply. To comply with safety standards,
this plate must be properly grounded to protective earth (see mechanical dimension notes). Pre-compliance testing has shown the stand-alone power supply to comply with
EN55022 class B radiated emissions with a metal enclosure with grounded base plate. See
PQC-COVER
for details - testing was based on adding a toroid, Fair-
Rite#5961004901 with five turns of both of the output leads. Radiated emission results vary with system enclosure and cable routing paths.
EMI CONSIDE
STATUS AND CONTROL SIGNALS
Parameter
PS_ON
PWR_OK
Models
All Models
All Models
Conditions
This pin must be pulled low (sink current >2mA) to +5V_AUX_RTN to turn on the main output. The +5V_AUX output is independent of the PS_ON
signal, and comes up automatically when the input AC or input DC voltage is applied within their specified operating ranges.
Open collector logic goes high
40-100ms
after the main output is within regulation; it goes low at least
2msecs
before loss of regulation. Internal
10K pull up to +5V_Aux is provided. Applications using the PWR_OK signal should maintain a minimum load of 5W on the main output.
PART NUMBER STRUCTURE
PQC
250
-
xx
-
yyy
Options
D
1
= Droop
DRT = ORing; Droop; Output Terminal Block
H = DC input
2
Link back to
Input_Table
PQC= “Power, Quality, Convection Cooled”
Main Output Voltage
(12, 18, 24, 36, 48, 54)
Output Power (Watts)
Examples: PQC250-24
= Base 24V Model; no options
PQC250-24D
= Base model, 24V Model with Droop Current Share option
PQC250-24DRT=
Base model, 24V Model with Droop Current Share, ORing isolation and Terminal Block options
1
not available for 18V model
2
CCC Certification not included for “H” models and 30V models
www.murata-ps.com/support
PQC250.A13 Page 3 of 8
PQC250 Series
250W 3" x 5" Convection Cooled AC-DC Power Supply
PERFORMANCE TYPICAL DATA EXAMPLES
Efficiency 48V Model
Ripple, 12V Model
Transient Performance,
12V Model
Transient Performance, 12V Model
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PQC250.A13 Page 4 of 8
PQC250 Series
250W 3" x 5" Convection Cooled AC-DC Power Supply
PERFORMANCE DATA
Start Up Performance ,12V Model shown
THERMAL CONSIDERATIONS
System thermal management is critical to the performance and reliability of the PQC250 series power supplies. Performance
derating curves
are provided
which can be used as a guideline for what can be achieved in a system configuration with controlled airflow at various input voltage conditions.
The product is designed to provide 250W using natural convection cooling when mounted horizontally with un-obstructed convection current airflow flow at
room temperature. At elevated temperature the power supply data is taken while it is surrounded by a large vented enclosure to minimize forced cross flows
inherent in the elevated temperature test.
The product is capable of operation when mounted in other orientations; operational/derating curves shall be provided to show the effect of such mounting.
See
ACAN-77
for additonal details
Capacitor case temperature and Mounting Orientation:
The power supply can operate in any orientation; however, the power supply contains overtemperature protection that will shut off the output as the
temperature of the power supply heatsinks approach the limt specified in the
protection table.
Additonally, life expectantcy of the power supply is inversely
proportional to the case temperature of electrolytic capacitors
C25, C25A, C711 & C712.
The designer of the system in which this power supply is deployed
should consider this relationship to ensure optium product life. The following charts illustrate this relationship:
The PQC250 Series will also benefit from the provision of forced cooling airflow (generated by an external host system fan). This will enable operation at
potentially higher local surrounding ambient temperatures.
Please refer to
ACAN-78
for additonal details
Derating Curve vs. Temperature (based on horizontal mounting, PTH components facing up, natural convection)
Derating curves are provided to indicate operation at varying input voltages with respect to temperature. See
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