DC-DC Converters DC-DC Converters Input output isolation tes
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3-Family
DC-DC Converters
DC-DC Converters
Input output isolation test voltage Single dual output Input voltage range High efficiency Short-circuit-proof derating plastic package cost
3-Family
Table Contents
Page
Type Survey Description Safety Installation Instructions Immunity Environmental Conditions Electrical Input Output Data Mechanical Data Type Product Marking
Type Survey
Table Type survey
Output
±250 ±125 ±100
Input voltage range 9.18 18.36 20.60 36.72
Nominal input voltage
Input output isolation Test voltage: min. Resistance: min.
Type 3-05-2 3-12-2 3-15-2 3-0505-2 3-1212-2 3-1515-2
types: Output current "Output Data".
Description
family DC-DC converters have been developed powering commercial type electronic circuits, e.g. telephone systems components, industrial controllers small appliances. They suitable applications Block Diagrams
with standard battery voltages. converters feature good efficiency good dynamic response load changes start-up. modules short-circuit no-load proof.
Ref.
Control Ref.
Control
Attention: µF/100 must added application minimize ripple noise <100 mVpp (Capacitors should types)
Attention: µF/100 must added application o=10 minimize ripple noise <100 mVpp (Capacitors should types)
Fig. Single output converter block diagram
Fig. Dual output converter block diagram
MELCHER
Power Partners.
Edition 2/96 Melcher
DC-DC Converters
3-Family
Safety Installation Instructions
Safety output circuit DC-DC converter operator-accessible according related safety standards, shall SELV circuit (Safety Extra Voltage circuit, i.e. circuit, separated from mains least basic insulation, that designed protected that under normal single fault conditions, voltage between conductors between conductor earth does exceed following section interpretation provided safety standard with respect safety status output circuit. However, sole responsibility installer user assure compliance with relevant applicable safety standards. following table observed, output DC-DC converter considered SELV.
Table Insulation concept SELV circuits
Nominal mains supply voltage (AC) Minimum required grade isolation, provided AC-DC front end, including mains supplied battery charger Basic Maximum output voltage from front Double reinforced Minimum required safety status front output circuit Minimum required grade isolation between input output DC-DC converter, provided converter Operational Operational Operational Resulting safety status DC-DC converter output circuit SELV circuit Earthed SELV circuit SELV circuit
Earthed SELV circuit Unearthed hazardous voltage secondary circuit SELV circuit
Double reinforced insu- Operational lated unearthed hazardous voltage secondary circuit, supplying SELV circuit
earth connection provided installer according relevant safety standard, e.g. 950. output protected against overvoltages higher than external means, e.g. overvoltage suppressor diode. insulated from earth least basic insulation according relevant safety standard, based maximum input voltage DC-DC converter. insulated from earth double reinforced insulation according relevant safety standard, based maximum input voltage DC-DC converter.
Installation Instructions
Table assignment
Type Single output Double output n.c. n.c. n.c. n.c.
Connection Series outputs more units connected series. suppressor diodes required. Melcher, however recommends protect each individual output with Zener diode preferably suppressor diode, avoid reverse polarity that occur output voltages rise simultaneously. Connection Parallel outputs several units connected parallel. However, single unit with higher power rating better choice, because uneven power distribution among outputs connected parallel. recommended select converters connected parallel with very small output voltage differences full load (i.e. ±0.5 decoupling diode required recommended.
Filter recommendations compliance with 55022, class Electromagnetic emission requirements according 55022, class easely achieved adding external input filter consisting additional capacitors current compensated circular double choke. filter components should placed close possible input converter.
Fig. Input filter arrangement
Table Input filter components
Input voltage
Type Siemens 32522 C1225-K
Type Siemens 82722 A2202-N1
Type Al-Chip (low ESR)
Only valid input voltages
Edition 2/96 Melcher
MELCHER
Power Partners.
3-Family
DC-DC Converters
Immunity Environmental Conditions
Thermal Considerations
Table Temperature specification
Characteristics Conditions Unit
Ambient temperature Case temperature Storage temperature
operational
Table MTBF
Values specified Case Temperature MTBF according MIL-HDBK-217F, Ground Benign 40°C 3'984'000 Ground Fixed 40°C 896'100 Ground Mobile 50°C 343'800 Unit
Electrical Input Output Data
General condition: 25°C unless otherwise specified Table Input data
Input Characteristics Conditions 1.25 shunt diode external fuse Unit
Input voltage range Nominal input voltage load input current Input current limitation response Reverse input voltage protection
min.TA max,
nom, nom, full load negative reverse polarity
1.25 shunt diode external fuse
Table Input data
Input Characteristics Conditions 1.25 shunt diode external fuse Unit
Input voltage range Nominal input voltage load input current Input current limitation response Reverse input voltage protection
min.TA max,
nom, nom, full load negative reverse polarity
1.25 shunt diode external fuse
MELCHER
Power Partners.
Edition 2/96 Melcher
Table Output data
Output Characteristics Conditions
DC-DC Converters
3-Family
3-05 4.90 ±0.02 5.10
3-12 11.76 ±0.02 12.24
3-15 14.70 ±0.02 15.30 Unit
Nominal output voltage
Nominal output current: types other types Output voltage noise: without with Static line regulation Static load regulation Temperature coefficient Switching frequency
min.Ui nom, MHz) min. max, nom, nom,
mVpp
Efficiency types other types
nom,
Table Output data
Output Characteristics Conditions 3-0505 ±4.90 ±200 ±250 ±0.02 ±0.02 ±5.10 3-1212 ±11.76 ±100 ±125 ±0.02 ±12.24 3-1515 ±14.70 ±100 ±15.30 Unit
Nominal output voltage
Nominal output current: types other types Output voltage noise: without with Static line regulation Static load regulation Temperature coefficient Switching frequency
nom, min. nom, nom, MHz) min.U max, 0.2Io nom,
mVpp
Efficiency types other types
nom,
Edition 2/96 Melcher
MELCHER
Power Partners.
3-Family Mechanical Data
DC-DC Converters
Dimensions Tolerances ±0.3 unless otherwise specified.
min. 33.8 31.8 2.54
European Projection
mounting space required
Fig. Case: Weight:
Type Product Marking
Type Nominal input voltage volt 12.48 Blank Family Nominal output power watt Nominal output voltage output volt 5.15 Nominal output voltage output volt 5.15 Operational ambient temperature range Product Marking Main face: Melcher name, data code separate label, type converter, input voltage range assignment.
min.
MELCHER
Power Partners.
min. 22.3
15.24
20.3
Edition 2/96 Melcher
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