MEAN WELL RDDW20UW series: Isolated dual-output DC-DC converter - RDDW20UW-24

Description

RDDW20UW-24 — Isolated dual-output DC-DC converter

MEAN WELL RDDW20UW-24 is an isolated, regulated dual-output DC-DC converter accepting 8.5–160 V DC. It provides ±24 V DC relative to COM with 417 mA per rail. Its fully encapsulated 2 × 1 inch package is intended for railway applications; no minimum load is required.

Download MEAN WELL RDDW20UW Datasheet (PDF)

Series section: PDF pages 19–26.

Model and output specifications

Output voltage ±24 V DC relative to COM.
Rated output current 417 mA per output rail.
Series power and load limit 20 W series. Observe rated current and total output power together.
Minimum load No minimum load is required.
Voltage accuracy ±1.0%
Line regulation ±0.2%; low-to-high input at rated load.
Load regulation ±1.0%, measured over 0–100% load.
Ripple and noise 100 mVp-p. Measured at 20 MHz bandwidth with a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Switching frequency 200 kHz typical.
Maximum capacitive load 330 µF for each output.
Cross regulation ±5.0% with one output varied over 25–100% load.

Input, control and protection

Input voltage 8.5–160 V DC, 18:1 range. Nominal inputs listed are 12, 24, 48, 72, 96 and 110 V; specification test input is 72 V.
Input current 9 mA at no load; 309 mA at full load.
Typical efficiency 89% at the reference conditions.
Input filter and fuse Pi filter; recommended external 4 A fast-acting fuse.
Input surge withstand 200 V DC for 100 ms maximum.
Input undervoltage protection Start-up 9 V; shutdown 8 V.
Overload protection 110–180% of rated output power; automatic recovery after removal of the fault.
Short-circuit protection Continuous protection with automatic recovery.
Output overvoltage protection Clamp by diode.
Thermal protection Thermal shutdown is specified at +110°C case temperature; the permitted case temperature is +105°C. A separate restart threshold is not stated.
Remote ON/OFF Referenced to −Vin: >4–160 V or open circuit turns the output ON; <1.2 V or a short circuit turns it OFF.

Operating conditions and isolation

Operating temperature and cooling −40 to +95°C; free-air convection. Apply the load-derating limits.
Load derating Full load through 77°C; 60% load at 95°C.
Maximum case temperature 105°C.
Working humidity 20–90% RH, non-condensing.
Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
Temperature coefficient ±0.03%/°C over 0–95°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 72 V DC input, rated load, 25°C and 70% RH, unless otherwise stated.
Input-to-output withstand voltage 3 kV AC.
Isolation resistance 100 MΩ.
Isolation capacitance 20 pF typical.
Input-voltage derating 70% load at 8.5 V input; 100% from 12 to 160 V, subject also to temperature derating.
Altitude Up to 5000 m. Above 2000 m, reduce the allowable ambient temperature by 3.5°C for each additional 1000 m.

Mechanical design and installation

Dimensions 50.8 × 25.4 × 10.2 mm (L × W × H).
Case construction Fully encapsulated black-coated copper case with a non-conductive base.
Pin assignment 1 +Vin; 2 −Vin; 3 +Vout; 4 −Vout; 5 COM; 6 Remote ON/OFF. Check the bottom-view orientation before PCB assembly.
Mechanical drawing details Lead length 5.6 mm minimum. Drawing tolerances: x.x ±0.5 mm; x.xx ±0.25 mm. The pin-diameter note and drawing differ; confirm the supplied pin dimensions before finalizing the PCB holes.
Unit weight reference 35 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 UL 62368-1 and EAC TP TC 004 references are listed in the catalog.
EMC emission EN 50121-3-2 conducted Class A / Class B with external circuitry. The radiated-emission table entry is N/A.
EMC immunity ESD: 8 kV air / 6 kV contact, Level 3; radiated RF: 20 V/m, 80–1000 MHz, Level 3; conducted RF: 10 V, 0.15–80 MHz, Level 3; surge: 4 kV line-to-earth / 2 kV line-to-line, Level 4; EFT: 2 kV power line, Level 3, with the specified external input capacitor.
MTBF reference 1570 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 with EN 50121-3-2 EMC and EN 61373 shock/vibration references; apply the specified external circuitry and verify the completed equipment.
EMC filter selection The dual-output component table repeats RDDW20UW-15 and does not uniquely identify this voltage version. Obtain a manufacturer-confirmed external filter for this exact model and input range; do not assume the repeated table defines this model’s component ratings.

MEAN WELL RDDW20UW series: Isolated dual-output DC-DC converter - RDDW20UW-24

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RDDW20UW-24 — Isolated dual-output DC-DC converter MEAN WELL RDDW20UW-24 is an isolated, regulated dual-output DC-DC converter accepting 8.5–160 V DC.... Read more

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    Description

    RDDW20UW-24 — Isolated dual-output DC-DC converter

    MEAN WELL RDDW20UW-24 is an isolated, regulated dual-output DC-DC converter accepting 8.5–160 V DC. It provides ±24 V DC relative to COM with 417 mA per rail. Its fully encapsulated 2 × 1 inch package is intended for railway applications; no minimum load is required.

    Download MEAN WELL RDDW20UW Datasheet (PDF)

    Series section: PDF pages 19–26.

    Model and output specifications

    Output voltage ±24 V DC relative to COM.
    Rated output current 417 mA per output rail.
    Series power and load limit 20 W series. Observe rated current and total output power together.
    Minimum load No minimum load is required.
    Voltage accuracy ±1.0%
    Line regulation ±0.2%; low-to-high input at rated load.
    Load regulation ±1.0%, measured over 0–100% load.
    Ripple and noise 100 mVp-p. Measured at 20 MHz bandwidth with a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
    Switching frequency 200 kHz typical.
    Maximum capacitive load 330 µF for each output.
    Cross regulation ±5.0% with one output varied over 25–100% load.

    Input, control and protection

    Input voltage 8.5–160 V DC, 18:1 range. Nominal inputs listed are 12, 24, 48, 72, 96 and 110 V; specification test input is 72 V.
    Input current 9 mA at no load; 309 mA at full load.
    Typical efficiency 89% at the reference conditions.
    Input filter and fuse Pi filter; recommended external 4 A fast-acting fuse.
    Input surge withstand 200 V DC for 100 ms maximum.
    Input undervoltage protection Start-up 9 V; shutdown 8 V.
    Overload protection 110–180% of rated output power; automatic recovery after removal of the fault.
    Short-circuit protection Continuous protection with automatic recovery.
    Output overvoltage protection Clamp by diode.
    Thermal protection Thermal shutdown is specified at +110°C case temperature; the permitted case temperature is +105°C. A separate restart threshold is not stated.
    Remote ON/OFF Referenced to −Vin: >4–160 V or open circuit turns the output ON; <1.2 V or a short circuit turns it OFF.

    Operating conditions and isolation

    Operating temperature and cooling −40 to +95°C; free-air convection. Apply the load-derating limits.
    Load derating Full load through 77°C; 60% load at 95°C.
    Maximum case temperature 105°C.
    Working humidity 20–90% RH, non-condensing.
    Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
    Temperature coefficient ±0.03%/°C over 0–95°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 72 V DC input, rated load, 25°C and 70% RH, unless otherwise stated.
    Input-to-output withstand voltage 3 kV AC.
    Isolation resistance 100 MΩ.
    Isolation capacitance 20 pF typical.
    Input-voltage derating 70% load at 8.5 V input; 100% from 12 to 160 V, subject also to temperature derating.
    Altitude Up to 5000 m. Above 2000 m, reduce the allowable ambient temperature by 3.5°C for each additional 1000 m.

    Mechanical design and installation

    Dimensions 50.8 × 25.4 × 10.2 mm (L × W × H).
    Case construction Fully encapsulated black-coated copper case with a non-conductive base.
    Pin assignment 1 +Vin; 2 −Vin; 3 +Vout; 4 −Vout; 5 COM; 6 Remote ON/OFF. Check the bottom-view orientation before PCB assembly.
    Mechanical drawing details Lead length 5.6 mm minimum. Drawing tolerances: x.x ±0.5 mm; x.xx ±0.25 mm. The pin-diameter note and drawing differ; confirm the supplied pin dimensions before finalizing the PCB holes.
    Unit weight reference 35 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 UL 62368-1 and EAC TP TC 004 references are listed in the catalog.
    EMC emission EN 50121-3-2 conducted Class A / Class B with external circuitry. The radiated-emission table entry is N/A.
    EMC immunity ESD: 8 kV air / 6 kV contact, Level 3; radiated RF: 20 V/m, 80–1000 MHz, Level 3; conducted RF: 10 V, 0.15–80 MHz, Level 3; surge: 4 kV line-to-earth / 2 kV line-to-line, Level 4; EFT: 2 kV power line, Level 3, with the specified external input capacitor.
    MTBF reference 1570 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 with EN 50121-3-2 EMC and EN 61373 shock/vibration references; apply the specified external circuitry and verify the completed equipment.
    EMC filter selection The dual-output component table repeats RDDW20UW-15 and does not uniquely identify this voltage version. Obtain a manufacturer-confirmed external filter for this exact model and input range; do not assume the repeated table defines this model’s component ratings.

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