MEAN WELL SKMW40 series: isolated single-output DC-DC converter - SKMW40F-03

Description

MEAN WELL SKMW40F-03 — DC-DC converter

MEAN WELL SKMW40F-03 is an isolated, regulated single-output DC-DC converter providing 3.3 V DC, with an output-current range of 0–10000 mA. It operates from 9–36 V DC, has a 1 × 1 inch DIP package and provides 2 kV DC input-to-output isolation. Remote ON/OFF control is built in. The single output supports external voltage trimming.

Download MEAN WELL SKMW40 Datasheet (PDF)

Series section: PDF pages 33–40.

Model and output specifications

Parameter Specification
Complete model SKMW40F-03
Model selection SKMW40 identifies the single-output 40 W converter series. Input code F selects 9–36 V DC with 24 V DC nominal input. Output code 03 identifies 3.3 V DC.
Output voltage 3.3 V DC.
Output current range 0–10000 mA. No minimum load is required.
Rated power and load limit 40 W series rating. The 3.3 V model is limited to 10000 mA, corresponding to 33 W at nominal output voltage.
Voltage accuracy ±1.0%.
Line regulation ±0.2%, measured from low to high input voltage at rated load.
Load regulation ±0.5%, measured over 0–100% of rated load.
Ripple and noise 75 mVp-p, measured with 20 MHz bandwidth and a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Maximum capacitive load 10000 µF.
Typical switching frequency 300 kHz.
Start-up time 50 ms maximum.

Input, protection and control

Parameter Specification
Input voltage 9–36 V DC, 4:1 operating range; nominal 24 V DC.
Input current 12 mA at no load and 1570 mA at full load, at nominal input.
Typical efficiency 86%, at the reference test conditions.
Input surge 50 V DC for 100 ms maximum; this is a surge limit, not the continuous input rating.
Input filter and fuse Pi-type input filter. The manufacturer recommends an 8 A time-delay fuse.
Internal power dissipation 500 mW, as listed in the specification.
Short-circuit protection Continuous protection with automatic recovery.
Overload protection 110–200% of rated output power; recovers automatically after the fault is removed.
Overvoltage protection Clamping by diode.
Overtemperature protection Shuts down the output voltage and recovers automatically after the temperature falls.
Input undervoltage lockout Start-up threshold: 8.8 V DC; shutdown threshold: 8.5 V DC. These thresholds do not extend the specified normal input range.
Remote ON/OFF control Pin 3 (R.C.) is referenced to −Vin. Power ON with R.C. > 3.5 V DC and up to 12 V DC, or with the pin open. Power OFF with R.C. < 1.2 V DC or shorted to −Vin.
External output trim Typical adjustment range: ±10%. Connect the trim resistor between pin 5 (Trim) and −Vout for trim-up, or between pin 5 and +Vout for trim-down. Remain within the rated power and current limits.
Trim design reference For this 3.3 V model, PDF page 36 lists Vref = 1.24 V, R1 = 16.7 kΩ, R2 = 10 kΩ and R3 = 52.3 kΩ. Use that page’s equations to select the external resistor for the required output voltage; these are design constants, not a supplied resistor set.

Operating conditions and isolation

Parameter Specification
Operating temperature and cooling −40 to +80°C, with load derating. For natural convection, the curve permits 100% load through +30°C, 50% at +60°C and 30% at +80°C. Follow the curve between these points.
Baseplate cooling curve The separate baseplate curve shows 100% load through +60°C and 50% at +80°C. Use it only with the corresponding cooling arrangement and thermal verification. The operating-temperature limit remains +80°C.
Thermal-layout reference PDF page 38 shows a 95.4 × 85 × 1.6 mm, 2 oz copper PCB used for the SKMW40F-05 thermal evaluation. It is a reference test layout, not an included mounting accessory or a guaranteed result for every installation.
Maximum case temperature +110°C; this is a case-temperature limit, not an ambient-temperature rating.
Working humidity 20–90% RH, non-condensing.
Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
Temperature coefficient 0.03%/°C over 0–60°C.
Vibration 10–55 Hz, 10G; 1 minute per cycle, for 120 minutes along each of the X, Y and Z axes.
Input-to-output withstand voltage 2 kV DC (2000 V DC).
Isolation resistance 100 MΩ between input and output, measured at 500 V DC, 25°C and 70% RH.
Typical isolation capacitance 1500 pF between input and output.
Reference test conditions Unless otherwise specified, parameters are measured at normal 24 V DC input, rated load, 25°C and 70% RH.

Dimensions and PCB installation

Parameter Specification
Package and construction DIP 1 × 1 inch package with industry-standard pinout and a metal case.
Dimensions 25.4 × 25.4 × 10 mm (L × W × H); the mechanical drawing gives a height tolerance of ±0.5 mm.
Pin assignment Pin 1 = +Vin; pin 2 = −Vin; pin 3 = R.C.; pin 4 = −Vout; pin 5 = Trim; pin 6 = +Vout. Check the bottom-view pin diagram against the top-view PCB footprint.
PCB layout Pin diameter: 1.0 ±0.1 mm. Lead length: 5.6 mm minimum. The PCB footprint uses a 2.54 mm grid and 1.3 ±0.1 mm holes. Use the mechanical drawing for the unequal pin spacing and 20.32 mm spacing between pin rows.
Soldering limit 1–3 seconds at 260°C maximum, measured 1.5 mm from the case.
Unit weight reference 21 g per converter, as explicitly stated in the catalog packing entry.

EMC and reference information

Parameter Specification
Safety standards The datasheet lists UL 62368-1, CAN/CSA C22.2 No. 62368-1, LVD EN 62368 and EAC TP TC 004 approvals.
EMC emission conditions BS EN/EN 55032 (CISPR 32) conducted and radiated Class A/B performance requires the relevant external components and circuit. Verify the final equipment against the applicable EMC requirements.
Class A external circuit Refer to the radiated Class A circuit on PDF page 39. C1 is 10 µF; C3 is 2200 pF; C2 is not fitted. Confirm the required L1 inductance with the manufacturer before selecting that filter; use the complete reference circuit.
Class B external circuit For the Class B output-conducted and radiated reference circuit on PDF page 39: C1 = 10 µF; L1 = GSCM121160P-102-2P-AE; C2 = 2200 pF and C3 = 2200 pF. These are external design components, not an included accessory kit.
EMC immunity BS EN/EN 61000-4-2: Level 3, ±6 kV contact; -4-3: Level 2, 3 V/m; -4-4: Level 3, 2 kV; -4-5: Level 3, 2 kV line-to-line; -4-6: Level 3, 10 Vrms; -4-8: Level 3.
Reliability reference MTBF: 560 khrs to MIL-HDBK-217F at 25°C. This is a reliability reference value.
Manufacturer warranty reference The catalog states a 3-year manufacturer warranty.

MEAN WELL SKMW40 series: isolated single-output DC-DC converter - SKMW40F-03

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MEAN WELL SKMW40F-03 — DC-DC converter MEAN WELL SKMW40F-03 is an isolated, regulated single-output DC-DC converter providing 3.3 V DC,... Read more

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    Description

    MEAN WELL SKMW40F-03 — DC-DC converter

    MEAN WELL SKMW40F-03 is an isolated, regulated single-output DC-DC converter providing 3.3 V DC, with an output-current range of 0–10000 mA. It operates from 9–36 V DC, has a 1 × 1 inch DIP package and provides 2 kV DC input-to-output isolation. Remote ON/OFF control is built in. The single output supports external voltage trimming.

    Download MEAN WELL SKMW40 Datasheet (PDF)

    Series section: PDF pages 33–40.

    Model and output specifications

    Parameter Specification
    Complete model SKMW40F-03
    Model selection SKMW40 identifies the single-output 40 W converter series. Input code F selects 9–36 V DC with 24 V DC nominal input. Output code 03 identifies 3.3 V DC.
    Output voltage 3.3 V DC.
    Output current range 0–10000 mA. No minimum load is required.
    Rated power and load limit 40 W series rating. The 3.3 V model is limited to 10000 mA, corresponding to 33 W at nominal output voltage.
    Voltage accuracy ±1.0%.
    Line regulation ±0.2%, measured from low to high input voltage at rated load.
    Load regulation ±0.5%, measured over 0–100% of rated load.
    Ripple and noise 75 mVp-p, measured with 20 MHz bandwidth and a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
    Maximum capacitive load 10000 µF.
    Typical switching frequency 300 kHz.
    Start-up time 50 ms maximum.

    Input, protection and control

    Parameter Specification
    Input voltage 9–36 V DC, 4:1 operating range; nominal 24 V DC.
    Input current 12 mA at no load and 1570 mA at full load, at nominal input.
    Typical efficiency 86%, at the reference test conditions.
    Input surge 50 V DC for 100 ms maximum; this is a surge limit, not the continuous input rating.
    Input filter and fuse Pi-type input filter. The manufacturer recommends an 8 A time-delay fuse.
    Internal power dissipation 500 mW, as listed in the specification.
    Short-circuit protection Continuous protection with automatic recovery.
    Overload protection 110–200% of rated output power; recovers automatically after the fault is removed.
    Overvoltage protection Clamping by diode.
    Overtemperature protection Shuts down the output voltage and recovers automatically after the temperature falls.
    Input undervoltage lockout Start-up threshold: 8.8 V DC; shutdown threshold: 8.5 V DC. These thresholds do not extend the specified normal input range.
    Remote ON/OFF control Pin 3 (R.C.) is referenced to −Vin. Power ON with R.C. > 3.5 V DC and up to 12 V DC, or with the pin open. Power OFF with R.C. < 1.2 V DC or shorted to −Vin.
    External output trim Typical adjustment range: ±10%. Connect the trim resistor between pin 5 (Trim) and −Vout for trim-up, or between pin 5 and +Vout for trim-down. Remain within the rated power and current limits.
    Trim design reference For this 3.3 V model, PDF page 36 lists Vref = 1.24 V, R1 = 16.7 kΩ, R2 = 10 kΩ and R3 = 52.3 kΩ. Use that page’s equations to select the external resistor for the required output voltage; these are design constants, not a supplied resistor set.

    Operating conditions and isolation

    Parameter Specification
    Operating temperature and cooling −40 to +80°C, with load derating. For natural convection, the curve permits 100% load through +30°C, 50% at +60°C and 30% at +80°C. Follow the curve between these points.
    Baseplate cooling curve The separate baseplate curve shows 100% load through +60°C and 50% at +80°C. Use it only with the corresponding cooling arrangement and thermal verification. The operating-temperature limit remains +80°C.
    Thermal-layout reference PDF page 38 shows a 95.4 × 85 × 1.6 mm, 2 oz copper PCB used for the SKMW40F-05 thermal evaluation. It is a reference test layout, not an included mounting accessory or a guaranteed result for every installation.
    Maximum case temperature +110°C; this is a case-temperature limit, not an ambient-temperature rating.
    Working humidity 20–90% RH, non-condensing.
    Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
    Temperature coefficient 0.03%/°C over 0–60°C.
    Vibration 10–55 Hz, 10G; 1 minute per cycle, for 120 minutes along each of the X, Y and Z axes.
    Input-to-output withstand voltage 2 kV DC (2000 V DC).
    Isolation resistance 100 MΩ between input and output, measured at 500 V DC, 25°C and 70% RH.
    Typical isolation capacitance 1500 pF between input and output.
    Reference test conditions Unless otherwise specified, parameters are measured at normal 24 V DC input, rated load, 25°C and 70% RH.

    Dimensions and PCB installation

    Parameter Specification
    Package and construction DIP 1 × 1 inch package with industry-standard pinout and a metal case.
    Dimensions 25.4 × 25.4 × 10 mm (L × W × H); the mechanical drawing gives a height tolerance of ±0.5 mm.
    Pin assignment Pin 1 = +Vin; pin 2 = −Vin; pin 3 = R.C.; pin 4 = −Vout; pin 5 = Trim; pin 6 = +Vout. Check the bottom-view pin diagram against the top-view PCB footprint.
    PCB layout Pin diameter: 1.0 ±0.1 mm. Lead length: 5.6 mm minimum. The PCB footprint uses a 2.54 mm grid and 1.3 ±0.1 mm holes. Use the mechanical drawing for the unequal pin spacing and 20.32 mm spacing between pin rows.
    Soldering limit 1–3 seconds at 260°C maximum, measured 1.5 mm from the case.
    Unit weight reference 21 g per converter, as explicitly stated in the catalog packing entry.

    EMC and reference information

    Parameter Specification
    Safety standards The datasheet lists UL 62368-1, CAN/CSA C22.2 No. 62368-1, LVD EN 62368 and EAC TP TC 004 approvals.
    EMC emission conditions BS EN/EN 55032 (CISPR 32) conducted and radiated Class A/B performance requires the relevant external components and circuit. Verify the final equipment against the applicable EMC requirements.
    Class A external circuit Refer to the radiated Class A circuit on PDF page 39. C1 is 10 µF; C3 is 2200 pF; C2 is not fitted. Confirm the required L1 inductance with the manufacturer before selecting that filter; use the complete reference circuit.
    Class B external circuit For the Class B output-conducted and radiated reference circuit on PDF page 39: C1 = 10 µF; L1 = GSCM121160P-102-2P-AE; C2 = 2200 pF and C3 = 2200 pF. These are external design components, not an included accessory kit.
    EMC immunity BS EN/EN 61000-4-2: Level 3, ±6 kV contact; -4-3: Level 2, 3 V/m; -4-4: Level 3, 2 kV; -4-5: Level 3, 2 kV line-to-line; -4-6: Level 3, 10 Vrms; -4-8: Level 3.
    Reliability reference MTBF: 560 khrs to MIL-HDBK-217F at 25°C. This is a reliability reference value.
    Manufacturer warranty reference The catalog states a 3-year manufacturer warranty.

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