MPB125 AC/DC Power Supply Series APPLICATIONS NOTE REV. 2003

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MPB125 AC/DC Power Supply Series APPLICATIONS NOTE REV. 2003

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MPB125 AC/DC Power Supply Series Applications Note
MPB125 AC/DC Power Supply Series
APPLICATIONS NOTE
REV. 2003
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MPB125 AC/DC Power Supply Series Applications Note
INTRODUCTION This specification defines design performance characteristics single-phase, universal input, power factor corrected, multiple output, 125-watt open frame switch mode power supply. includes information regarding operational details, cooling requirements, signal specifications power supply. INPUT LINE REQUIREMENTS following table defines voltage frequency line inputs power supply. power supply capable supplying full-rated power continuous operation throughout specified ranges voltages frequencies. power supply will automatically recover from power loss shall capable startup under peak loading 90VAC.
Table
Minimum Voltage Frequency
Nominal 100-240
Maximum
Unit VAC(RMS)
Inrush Current Limiting Inrush current shall limited peak 115VAC, cold start. Repetitive ON/OFF cycling input voltage shall damage power supply cause input fuse blow. Input Undervoltage power supply contains protection circuitry such that application input voltage below minimums specified Table shall cause damage power supply. Voltage Hold-Up Time power supply will maintain output regulation despite loss input power 100VAC/50Hz 230VAC/47Hz maximum continuous output load minimum Immunity power supply, minimum, shall pass testing limits methods described EN55024. These tests include: Radio Frequency Electromagnetic Field Fast Transients Common Mode Surge Immunity Test Conducted Disturbances Induced Fields Power Frequency Magnetic Field Susceptibility Voltage Dips Voltage Interruption
REMOTE SENSING quad-output models, remote sensing provided compensate voltage drops Return +3.3V 2.5V connections load. dual output models, Remote Sense provided main output. 0.1V Return connection (-Sense) 0.2V positive connection (+Sense) compensated. remote sense lines connected follows: -Sense lead should connected times, either pins output connector remote load location. When desired +Sense lead, connect corresponding point load.
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MPB125 AC/DC Power Supply Series Applications Note
Power supply without sense utilized
Power supply with sense utilized
sense
sense
+3.3V output
+3.3V output
Load
Load
sense
Connect
sense
Figure
Figure illustrates possible connection schemes remote sense model MPB125-4350. POWER DISTRIBUTION LOADING QUAD TRIPLE OUTPUT MODELS following cross-loading diagram (Figure illustrates maximum power level each output. Please refer following tables diagrams specific applications. basic cross-loading envelope formed rectilinear lines representing maximum watts combined +3.3V/2.5V outputs, maximum load Amps +12V output. upper right corner limited overall power limit watts. graph bottom left hand corner indicates that minimum watts loading combination three main outputs required guarantee regulation. graph left bottom right corners represent limits guaranteed regulation +12V outputs. Operation outside these limits permitted additional 1.5% regulation band acceptable.
(0.5A,80W (3.75A,80W
(5.0A,
+3.3V watts
(3.0A,
(5.0A,
+12V amps
Figure
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MPB125 AC/DC Power Supply Series Applications Note
EFFICIENCY
power supply will meet efficiencies least under defined loading conditions specified 230VAC 25°C. Efficiency curves shown Figure
Table MPB125-4350
Table MPB125-4250
Voltage +3.3V +12V -12V
Current 3.7A 9.4A 5.0A 0.5A
Voltage +2.5V +12V -12V
Current 3.7A 9.4A 5.0A 0.5A
Table MPB125-2012, MPB125-2024, MPB125-2048
Output
Output Power 100W
Efficiency
90.0%
85.0%
Efficiency
115VAC 80.0% 230VAC
75.0%
70.0% 100%
Output Load Figure
OUTPUT CHARACTERISTICS Ripple/Noise
Ripple noise defined periodic random signals over frequency band 10Hz 20MHz. Measurements made with oscilloscope with least 20MHz bandwidth. Outputs should bypassed connector with 0.1µF ceramic disk capacitor 10µF tantalum capacitor simulate system loading. Ripple noise shall exceed limits specified following table.
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MPB125 AC/DC Power Supply Series Applications Note
Ripple/Noise Limits ripple voltage outputs shall measured pins mating connector using differential measurement sleeve single probe. Ripple specification shall under condition line voltage frequency loading.
Table
Output +2.5V +3.3V +5.05V +12V -12V +24V +48V
Maximum Ripple (pk-pk) 50mV 50mV 50mV 120mV 120mV 240mV 480mV
RIPPLE/NOISE TEST SETUP
Figure
additional details measure differential noise ripple, please Apps Note
Output Transient Response maximum output voltage transient caused step load changes shall exceed established output voltage regulation limits. power supply shall stable when subjected load transients described below: Load changes output, with power supply loading. Load changing repetition 50Hz 333Hz. Transient load slew rate 1.0A/usec input range specified Table Capacitive loading Table
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MPB125 AC/DC Power Supply Series Applications Note
Capacitive Load power supply will power operate normally with following capacitances listed Table simultaneously present outputs.
Table
Output +2.5V MPB125-4250 +3.3V MPB125-4350 Quad triple models +12V Quad triple models -12V Quad triple models +12V Main MPB125-2012 +24V MPB125-2024 +48V MPB125-2048 +12V Aux. Dual Output models
Capacitive Load (µF) 6,000µF 6,000µF 10,000µF 1,000µF 350µF 4,000µF 2,000µF 1,000µF 350µF
+5V/+3.3V POWER SEQUENCING MPB125-4350
+12V output levels equal greater than +3.3V output times during power normal operation. time between +12V output reaching minimum in-regulation level +3.3V reaching minimum in-regulation level must <=25ms.
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MPB125 AC/DC Power Supply Series Applications Note
POWER SUPPLY TIMING
+5VDC
GOOD
Figure
200m 0.2m 100m
1.5s 500m <50us
->16m
Output Rise Time output voltages shall rise from nominal within regulation range within 0.2ms 20ms. output voltages waveform shall monotonic ramp from regulation band under loading conditions specified Figure monotonic ramp condition requires that turn-on waveform positive have value between 0V/ms [Vout nominal/0.1] V/ms. segment risetime waveform, straight line drawn between points waveform segment must have positive slope [Vout nominal/20] V/ms.
POWER GOOD SIGNAL
Power Good Signal shall provide logic "high" level indicate that sufficient time transpired outputs within their regulation limits. This delay time ensures that sufficient primary side energy stored power supply continuous power operation within specified hold-up time. When power removed period longer than 16ms, Power Good Signal will logic "low" level. specifications Power Good output contained Table
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MPB125 AC/DC Power Supply Series Applications Note
Table
Signal Type Logic Level "Low" Logic Level "High" High State Output Impedance Power Delay Power Down Warning Rise Time
OVERSHOOT TURN ON/TURN
+5VDC, compatible <0.4V when sinking Between 2.4V when sourcing 2Kohm from output Between 500ms after outputs reach nominal >1ms before +3.3V main output reach nominal <50uS from point.
output voltage overshoot upon application removal input mains voltage shall less than above nominal voltage. voltage opposite polarity shall present output during turn turn off.
OUTPUT PROTECTION Reset After Shutdown power supply latches because fault condition outputs, power supply will return normal operation only after fault removed; power supply will then restart automatically after seconds. Short-Circuit Protection short circuit defined impedance <0.1ohm placed between return output. short circuit will cause damage power supply will cause shutdown. power supply will attempt restart every seconds until short-circuit condition removed. After removal short circuit, power supply will maintain normal operations.
short circuit -12V output quad triple models will cause power supply shut down; however, after short circuit removed, -12V output will resume normal operation. same short circuit characteristic applies auxiliary +12V output dual output models.
Load Operation power supply will operate with load outputs with damage hazardous condition. power supply will remain stable restart normally after application loads.
CAUTION
load cable been removed, turn mains switch reconnect loads.
Overcurrent Protection Overload currents applied each tested output will cause output trip before reaching exceeding SELV level 240VA. testing purposes overload current should ramped minimum rate 10A/s starting from full load.
OUTPUT BYPASS
output return return) connected power supply chassis plated thru mounting hole near input connector. Mounting hardware should exceed 0.282 inches diameter lock washer, flat washer, standoff, screw head other mounting hardware.
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MPB125 AC/DC Power Supply Series Applications Note
COOLING REQUIREMENTS power supply used under certain output loading conditions natural convection cooling with forced aircooling. Natural Convection recommended maximum continuous output rating outputs combined ambient watts. Under natural convection cooling, maximum continuous rating +3.3V outputs MPB125-4350, 2.5V outputs MPB125-4250 watts. output MPB1253000, maximum natural convection rating watts. Forced Cooling maximum continuous rating outputs combined watts with minimum forced-air cooling through cross-sectional area 1.25" 3.00". quad output models, maximum continuous rating watts. recommended flow direction from input output. MPB125 Thermal Testing Procedures proper cooling, unit must enclosure measuring 0.25 inch wider 0.135 inch above unit. Thermal measurements taken 3.5" 1.6" 12.0" (88.9mm 40.6mm 304.8mm) wind tunnel (Figure power supply must standoffs that bring bottom 0.375 inches from bottom enclosure. minimum airflow must measured from back enclosure. proper measure airflow measure evenly spaced points behind unit average them (Figure unit with airflow from four directions. recommended flow direction from input output. Attached temperature results from thermal tests. Component temperatures shown various orientations.
inches
POWER SUPPLY inches
Figure Measure Airflow from Evenly-Spaced Points Behind Unit
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MPB125 AC/DC Power Supply Series Applications Note
inches
inches
Figure
ELECTROMAGNETIC COMPATIBILITY power supply complies with EN55022 CISPR22 Class conducted emissions with -4dB guard band. Input Line Current Harmonics power supply shall comply with EN61000-3-2.
RELIABILITY Component Derating following component derating guidelines shall followed: Semiconductor junction temperatures shall exceed 110°C with ambient 50°C. Inductor winding temperatures shall exceed safety agency requirements. Capacitor case temperatures shall exceed rated temperature. Resistor power dissipation derating shall greater than 30%. Component voltage current derating shall greater than 40°C. Mean Time Between Failures (MTBF) calculated MTBF power supply shall equal greater than 200,000 hours continuous operation 25°C, subject maximum output loading worst case input line voltage, while meeting specified output requirements confidence level. MTBF power supply shall calculated accordance with Bellcore, TR-332, Issue
NUCLEAR MEDICAL APPLICATIONS Power-One products authorized critical components life support systems, equipment used hazardous environments, nuclear control systems without express written consent respective divisional president Power-One, Inc. TECHNICAL REVISIONS appearance products, including safety agency certifications pictured labels, change depending date manufactured. Specifications subject change without notice.
REV. 2003
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MPB125 AC/DC Power Supply Series APPLICATIONS NOTE REV. 2003

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