MEAN WELL SKM50 series: Isolated regulated single-output DC-DC converter - SKM50B-15

Description

SKM50B-15 — Isolated regulated single-output DC-DC converter

MEAN WELL SKM50B-15 is an isolated, regulated single-output DC-DC converter with 15 V DC output and a specified current range of 0.33–3.33 A. Its 2 × 1 inch package accepts 18–36 V DC and provides 1.5 kV DC input-to-output isolation. Remote ON/OFF control and external output adjustment are built in.

Download MEAN WELL SKM50 Datasheet (PDF)

Series section: PDF pages 9–10.

Model and output specifications

Complete model SKM50B-15
Model selection SKM50 identifies the 50 W single-output series. Input code B selects 18–36 V DC; output code 15 selects 15 V DC.
Output voltage 15 V DC.
Output current range 0.33–3.33 A. Maintain the specified minimum load.
Rated power and load limit 50 W. Observe the stated current limits and total power limit together.
Voltage accuracy ±2.0%.
Line regulation ±0.2%, measured from low to high input voltage at rated load.
Load regulation ±0.5%, measured over 10–100% of rated load.
Ripple and noise 100 mVp-p maximum, measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Switching frequency 300 kHz typical.
Maximum capacitive load 1000 µF.

Input and protection

Input voltage 18–36 V DC; 2:1 input range.
Input current 110 mA at no load; 2300 mA at full load, at the reference test conditions.
Typical efficiency 90% at the reference test conditions.
Input filter and protection Built-in EMI filter with a Pi network. An external input fuse is recommended.
Overload protection 110–180% of rated output power; hiccup mode with automatic recovery after the fault is removed.
Short-circuit protection All outputs are protected; hiccup mode with automatic recovery after the fault is removed.
Fault-duration limit Do not allow operation in overload or short circuit for more than 30 seconds.
Input undervoltage shutdown 16 V DC. Maintain the normal input-voltage range during operation.
Input overvoltage protection Typical input threshold: >40–50 V DC; output shutdown with automatic recovery after the fault is removed. These thresholds do not extend the normal input range.
Output overvoltage protection Typical output threshold: 18–23.3 V. Protection is by a TVS diode clamp.

Control and output adjustment

Remote ON/OFF control R.C. is referenced to −Vin. Power ON: above 2.5 V up to 30 V DC, or open circuit. Power OFF: below 0.5 V DC, or short circuit to −Vin.
External output trim −20% to +10%, typical. The reference circuit connects a variable resistance from Trim to −Vout for trim-up, or from Trim to +Vout for trim-down. The three-terminal trimpot example uses 500 kΩ across +Vout and −Vout with its wiper connected to Trim pin 6. Follow the complete diagram; observe current and power limits during adjustment.

Operating conditions and isolation

Operating temperature and cooling −40 to +75°C, with free-air convection and the specified derating.
Load derating For this 15 V model, full load through 55°C; reduce to 50% load at 75°C.
Maximum case temperature 115°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 0–55°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 Normal input, rated load, 25°C ambient and 70% RH, unless otherwise stated.
Input-to-output withstand voltage 1.5 kV DC.
Isolation resistance 100 MΩ at 500 V DC, 25°C and 70% RH.

Mechanical design and installation

Dimensions 50.8 × 25.4 × 13.7 mm (L × W × H), as listed in the specification.
Case and production testing Metal case with shielding on all six sides; 100% burn-in test. The catalog describes a low-cost design with an emphasis on reliability.
Pin assignment 1 +Vin; 2 −Vin; 3 R.C.; 4 +Vout; 5 −Vout; 6 Trim. Check the bottom-view orientation before PCB assembly.
Mechanical drawing details Pin diameter: 1 mm; pin tolerance ±0.1 mm and other dimensional tolerance ±0.8 mm. Lead length: 5.8 mm; longitudinal pin spacing: 45.72 mm. Use the complete bottom-view drawing and side view.
Unit weight reference 43 g per converter, explicitly stated in the catalog packing entry.

EMC and manufacturer references

Safety standards EAC TP TC 020/2011 approved.
Catalog approvals FCC, EAC, CE and UKCA are listed in the manufacturer’s features.
EMC emission BS EN/EN 55032 Class A, FCC Part 15 Class A, and EAC TP TC 020. The datasheet specifies compliance without external components; consult MEAN WELL for a Class B implementation.
EMC immunity BS EN/EN 61000-4-2, -4-3, -4-4, -4-5, -4-6 and -4-8; light-industrial level, criterion A; EAC TP TC 020.
Reliability reference MTBF: 700 khrs minimum to MIL-HDBK-217F at 25°C. This is a reliability reference value.
Manufacturer warranty reference The catalog states a 2-year manufacturer warranty.

MEAN WELL SKM50 series: Isolated regulated single-output DC-DC converter - SKM50B-15

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SKM50B-15 — Isolated regulated single-output DC-DC converter MEAN WELL SKM50B-15 is an isolated, regulated single-output DC-DC converter with 15 V... Read more

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    Description

    SKM50B-15 — Isolated regulated single-output DC-DC converter

    MEAN WELL SKM50B-15 is an isolated, regulated single-output DC-DC converter with 15 V DC output and a specified current range of 0.33–3.33 A. Its 2 × 1 inch package accepts 18–36 V DC and provides 1.5 kV DC input-to-output isolation. Remote ON/OFF control and external output adjustment are built in.

    Download MEAN WELL SKM50 Datasheet (PDF)

    Series section: PDF pages 9–10.

    Model and output specifications

    Complete model SKM50B-15
    Model selection SKM50 identifies the 50 W single-output series. Input code B selects 18–36 V DC; output code 15 selects 15 V DC.
    Output voltage 15 V DC.
    Output current range 0.33–3.33 A. Maintain the specified minimum load.
    Rated power and load limit 50 W. Observe the stated current limits and total power limit together.
    Voltage accuracy ±2.0%.
    Line regulation ±0.2%, measured from low to high input voltage at rated load.
    Load regulation ±0.5%, measured over 10–100% of rated load.
    Ripple and noise 100 mVp-p maximum, measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
    Switching frequency 300 kHz typical.
    Maximum capacitive load 1000 µF.

    Input and protection

    Input voltage 18–36 V DC; 2:1 input range.
    Input current 110 mA at no load; 2300 mA at full load, at the reference test conditions.
    Typical efficiency 90% at the reference test conditions.
    Input filter and protection Built-in EMI filter with a Pi network. An external input fuse is recommended.
    Overload protection 110–180% of rated output power; hiccup mode with automatic recovery after the fault is removed.
    Short-circuit protection All outputs are protected; hiccup mode with automatic recovery after the fault is removed.
    Fault-duration limit Do not allow operation in overload or short circuit for more than 30 seconds.
    Input undervoltage shutdown 16 V DC. Maintain the normal input-voltage range during operation.
    Input overvoltage protection Typical input threshold: >40–50 V DC; output shutdown with automatic recovery after the fault is removed. These thresholds do not extend the normal input range.
    Output overvoltage protection Typical output threshold: 18–23.3 V. Protection is by a TVS diode clamp.

    Control and output adjustment

    Remote ON/OFF control R.C. is referenced to −Vin. Power ON: above 2.5 V up to 30 V DC, or open circuit. Power OFF: below 0.5 V DC, or short circuit to −Vin.
    External output trim −20% to +10%, typical. The reference circuit connects a variable resistance from Trim to −Vout for trim-up, or from Trim to +Vout for trim-down. The three-terminal trimpot example uses 500 kΩ across +Vout and −Vout with its wiper connected to Trim pin 6. Follow the complete diagram; observe current and power limits during adjustment.

    Operating conditions and isolation

    Operating temperature and cooling −40 to +75°C, with free-air convection and the specified derating.
    Load derating For this 15 V model, full load through 55°C; reduce to 50% load at 75°C.
    Maximum case temperature 115°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 0–55°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 Normal input, rated load, 25°C ambient and 70% RH, unless otherwise stated.
    Input-to-output withstand voltage 1.5 kV DC.
    Isolation resistance 100 MΩ at 500 V DC, 25°C and 70% RH.

    Mechanical design and installation

    Dimensions 50.8 × 25.4 × 13.7 mm (L × W × H), as listed in the specification.
    Case and production testing Metal case with shielding on all six sides; 100% burn-in test. The catalog describes a low-cost design with an emphasis on reliability.
    Pin assignment 1 +Vin; 2 −Vin; 3 R.C.; 4 +Vout; 5 −Vout; 6 Trim. Check the bottom-view orientation before PCB assembly.
    Mechanical drawing details Pin diameter: 1 mm; pin tolerance ±0.1 mm and other dimensional tolerance ±0.8 mm. Lead length: 5.8 mm; longitudinal pin spacing: 45.72 mm. Use the complete bottom-view drawing and side view.
    Unit weight reference 43 g per converter, explicitly stated in the catalog packing entry.

    EMC and manufacturer references

    Safety standards EAC TP TC 020/2011 approved.
    Catalog approvals FCC, EAC, CE and UKCA are listed in the manufacturer’s features.
    EMC emission BS EN/EN 55032 Class A, FCC Part 15 Class A, and EAC TP TC 020. The datasheet specifies compliance without external components; consult MEAN WELL for a Class B implementation.
    EMC immunity BS EN/EN 61000-4-2, -4-3, -4-4, -4-5, -4-6 and -4-8; light-industrial level, criterion A; EAC TP TC 020.
    Reliability reference MTBF: 700 khrs minimum to MIL-HDBK-217F at 25°C. This is a reliability reference value.
    Manufacturer warranty reference The catalog states a 2-year manufacturer warranty.

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