MEAN WELL RDDW40 series: Isolated dual-output DC-DC converter - RDDW40G-12

Description

RDDW40G-12 — Isolated dual-output DC-DC converter

MEAN WELL RDDW40G-12 is an isolated, regulated dual-output DC-DC converter accepting 18–75 V DC. It provides ±12 V DC relative to COM with 1.666 A per rail. It is a fully encapsulated railway DC-DC module with remote ON/OFF and no minimum load requirement.

Download MEAN WELL RDDW40 Datasheet (PDF)

Series section: PDF pages 27–34.

Model and output specifications

Output voltage ±12 V DC relative to COM.
Rated output current 1.666 A per output rail.
Series power and load limit 40 W series. Observe both the model’s output-current limit and the total power limit; the series wattage does not override a lower current-limited output.
Minimum load No minimum load is required.
Voltage accuracy ±1.0%
Line regulation ±0.5%; low-to-high input at rated load.
Load regulation ±1.0%, measured over 0–100% load.
Ripple and noise 125 mVp-p. Measured at 20 MHz bandwidth with a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Switching frequency 250 kHz typical.
Maximum capacitive load 2600 µF for each output.
Cross regulation ±5.0% with one output varied over 25–100% load at 24/48 V input.

Input, control and protection

Input voltage 18–75 V DC; 4:1 range; nominal input 48 V.
Input current 15 mA at no load; 1 A at full load.
Typical efficiency 90% at nominal input and rated load.
Input filter and fuse Pi filter; recommended external 4 A time-delay fuse. Size and coordinate the fuse for the application.
Input surge withstand 100 V DC for 100 ms maximum.
Input undervoltage protection 16 V.
Overload protection 125–210% of rated output power; automatic recovery after the fault is removed.
Short-circuit protection Continuous short-circuit protection with automatic recovery.
Output overvoltage protection Clamp by diode.
Remote ON/OFF Referenced to −Vin: >3–12 V or open circuit turns the output ON; <1.2 V or a short circuit turns it OFF.
Overtemperature protection Case temperature 110°C maximum is specified; no separate restart threshold is stated.

Operating conditions and isolation

Operating temperature and cooling −40 to +90°C; free-air convection. Apply the load-derating limits.
Load derating Full load through 55°C; 50% at 75°C; 25% at 90°C.
Maximum case temperature 110°C.
Working humidity 20–90% RH, non-condensing.
Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
Temperature coefficient ±0.05%/°C over 0–55°C.
Vibration 10–500 Hz, 2G; 10 minutes per cycle for 60 minutes along each of the X, Y and Z axes.
Reference test conditions Nominal input, rated load, 25°C and 70% RH, unless otherwise stated.
Input-to-output withstand voltage 1.6 kV DC.
Isolation resistance 1000 MΩ.
Isolation capacitance 1500 pF typical.

Mechanical design and installation

Dimensions 50.8 × 25.4 × 10.5 mm (L × W × H).
Case construction Fully encapsulated metal case.
Pin assignment 1 +Vin; 2 −Vin; 3 Remote ON/OFF; 4 +Vout; 5 COM; 6 −Vout. Check the bottom-view orientation before PCB assembly.
Mechanical drawing details Lead length 5.6 mm minimum; pin diameter 1 ±0.1 mm; drawing tolerance ±0.35 mm.
Unit weight reference 37.6 g, explicitly stated as a catalog packing reference per unit.
Soldering 1–3 seconds at 260°C maximum, measured 1.5 mm from the case.

EMC and manufacturer references

Safety and catalog references EAC TP TC 020/2011 and TP TC 004/2011 approved; CE and UKCA shown in the catalog.
EMC emission BS EN/EN 55032 Class A / Class B performance depends on the applicable external circuit below.
EMC immunity IEC/BS EN/EN 61000-4-2: 8 kV air / 6 kV contact, Level 2; -4-4: 0.5 kV, Level 1; -4-5: 0.5 kV line-to-line, Level 1; -4-6: 10 V emf, Level 2; -4-8: 10 A/m.
MTBF reference 779 khrs to MIL-HDBK-217F at 25°C; a reliability reference, not a service-life guarantee.
Manufacturer warranty reference The catalog states a 3-year manufacturer warranty.
Railway application EN 50155 and IEC 60571 references include EN 61373 shock/vibration and EN 50121-3-2 EMC. Apply the model-specific external circuitry and verify the complete system.
EMC configuration Class A without external components; Class B requires the illustrated external filter. C1/C2 4.7 µF and L1 3.3 µH; C3/C4 2200 pF. Use components rated for the actual input and verify EMC in the final equipment.

MEAN WELL RDDW40 series: Isolated dual-output DC-DC converter - RDDW40G-12

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RDDW40G-12 — Isolated dual-output DC-DC converter MEAN WELL RDDW40G-12 is an isolated, regulated dual-output DC-DC converter accepting 18–75 V DC.... Read more

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    Description

    RDDW40G-12 — Isolated dual-output DC-DC converter

    MEAN WELL RDDW40G-12 is an isolated, regulated dual-output DC-DC converter accepting 18–75 V DC. It provides ±12 V DC relative to COM with 1.666 A per rail. It is a fully encapsulated railway DC-DC module with remote ON/OFF and no minimum load requirement.

    Download MEAN WELL RDDW40 Datasheet (PDF)

    Series section: PDF pages 27–34.

    Model and output specifications

    Output voltage ±12 V DC relative to COM.
    Rated output current 1.666 A per output rail.
    Series power and load limit 40 W series. Observe both the model’s output-current limit and the total power limit; the series wattage does not override a lower current-limited output.
    Minimum load No minimum load is required.
    Voltage accuracy ±1.0%
    Line regulation ±0.5%; low-to-high input at rated load.
    Load regulation ±1.0%, measured over 0–100% load.
    Ripple and noise 125 mVp-p. Measured at 20 MHz bandwidth with a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
    Switching frequency 250 kHz typical.
    Maximum capacitive load 2600 µF for each output.
    Cross regulation ±5.0% with one output varied over 25–100% load at 24/48 V input.

    Input, control and protection

    Input voltage 18–75 V DC; 4:1 range; nominal input 48 V.
    Input current 15 mA at no load; 1 A at full load.
    Typical efficiency 90% at nominal input and rated load.
    Input filter and fuse Pi filter; recommended external 4 A time-delay fuse. Size and coordinate the fuse for the application.
    Input surge withstand 100 V DC for 100 ms maximum.
    Input undervoltage protection 16 V.
    Overload protection 125–210% of rated output power; automatic recovery after the fault is removed.
    Short-circuit protection Continuous short-circuit protection with automatic recovery.
    Output overvoltage protection Clamp by diode.
    Remote ON/OFF Referenced to −Vin: >3–12 V or open circuit turns the output ON; <1.2 V or a short circuit turns it OFF.
    Overtemperature protection Case temperature 110°C maximum is specified; no separate restart threshold is stated.

    Operating conditions and isolation

    Operating temperature and cooling −40 to +90°C; free-air convection. Apply the load-derating limits.
    Load derating Full load through 55°C; 50% at 75°C; 25% at 90°C.
    Maximum case temperature 110°C.
    Working humidity 20–90% RH, non-condensing.
    Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
    Temperature coefficient ±0.05%/°C over 0–55°C.
    Vibration 10–500 Hz, 2G; 10 minutes per cycle for 60 minutes along each of the X, Y and Z axes.
    Reference test conditions Nominal input, rated load, 25°C and 70% RH, unless otherwise stated.
    Input-to-output withstand voltage 1.6 kV DC.
    Isolation resistance 1000 MΩ.
    Isolation capacitance 1500 pF typical.

    Mechanical design and installation

    Dimensions 50.8 × 25.4 × 10.5 mm (L × W × H).
    Case construction Fully encapsulated metal case.
    Pin assignment 1 +Vin; 2 −Vin; 3 Remote ON/OFF; 4 +Vout; 5 COM; 6 −Vout. Check the bottom-view orientation before PCB assembly.
    Mechanical drawing details Lead length 5.6 mm minimum; pin diameter 1 ±0.1 mm; drawing tolerance ±0.35 mm.
    Unit weight reference 37.6 g, explicitly stated as a catalog packing reference per unit.
    Soldering 1–3 seconds at 260°C maximum, measured 1.5 mm from the case.

    EMC and manufacturer references

    Safety and catalog references EAC TP TC 020/2011 and TP TC 004/2011 approved; CE and UKCA shown in the catalog.
    EMC emission BS EN/EN 55032 Class A / Class B performance depends on the applicable external circuit below.
    EMC immunity IEC/BS EN/EN 61000-4-2: 8 kV air / 6 kV contact, Level 2; -4-4: 0.5 kV, Level 1; -4-5: 0.5 kV line-to-line, Level 1; -4-6: 10 V emf, Level 2; -4-8: 10 A/m.
    MTBF reference 779 khrs to MIL-HDBK-217F at 25°C; a reliability reference, not a service-life guarantee.
    Manufacturer warranty reference The catalog states a 3-year manufacturer warranty.
    Railway application EN 50155 and IEC 60571 references include EN 61373 shock/vibration and EN 50121-3-2 EMC. Apply the model-specific external circuitry and verify the complete system.
    EMC configuration Class A without external components; Class B requires the illustrated external filter. C1/C2 4.7 µF and L1 3.3 µH; C3/C4 2200 pF. Use components rated for the actual input and verify EMC in the final equipment.

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