MEAN WELL SKA20W8 series: Isolated single-output DC-DC converter - SKA20W8-03

Description

SKA20W8-03 — Isolated single-output DC-DC converter

MEAN WELL SKA20W8-03 is an isolated, regulated single-output DC-DC converter accepting 9–75 V DC. It provides 3.3 V DC with 5000 mA. It uses an 8:1 input range and a shielded 2 × 1 inch package; no minimum load is required.

Download MEAN WELL SKA20W8 Datasheet (PDF)

Series section: PDF pages 64–71.

Model and output specifications

Output voltage 3.3 V DC.
Rated output current 5000 mA.
Series power and load limit 20 W series. The stated current limit also applies; do not infer a higher output current from the series wattage.
Minimum load No minimum load is required.
Voltage accuracy ±2.0%
Line regulation ±0.5%; low-to-high input at rated load.
Load regulation ±1%, measured over 0–100% load.
Ripple and noise 150 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 PWM typical.
Maximum capacitive load 1000 µF.

Input, control and protection

Input voltage 9–75 V DC; 8:1 range. Nominal inputs listed are 12, 24, 36, 48 and 72 V; specification test input is 24 V.
Input current 10 mA at no load; 809 mA at full load.
Typical efficiency 85% at the reference conditions.
Input filter and fuse Pi filter. The manufacturer recommends a 6 A slow-blow external fuse; select protection for the actual input current and installation.
Input surge withstand 100 V DC for 100 ms maximum.
Undervoltage lockout Typical values: start-up 8.8 V; shutdown 7.5 V.
Overload protection 110–230%; automatic recovery after removal of the fault.
Short-circuit protection Continuous protection with automatic recovery.
Output overvoltage protection Clamped by TVS.
Remote ON/OFF By request; confirm that the supplied configuration includes this function. Referenced to −Vin: >2.5–30 V or open circuit turns the output ON; <1 V or a short circuit turns it OFF.
Remote-control configuration Although the series overview and mechanical drawing show remote control, the protection specification labels it “By request”. Confirm the ordered configuration before using pin 3.
Output adjustment Use the single-output external-resistor trim circuit and stay within the rated voltage, current and power limits. Trim to −Vout raises the voltage; Trim to +Vout lowers it.
Trim reference values Vref 1.24 V; R1 2.43 kΩ; R2 1.47 kΩ; R3 7.5 kΩ. Use the manufacturer’s formulas and the exact model’s pin assignment.

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 75°C; 50% load at 90°C.
Maximum case temperature 110°C.
Working humidity 5–95% RH, non-condensing.
Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
Temperature coefficient ±0.03%/°C over 0–80°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 24 V DC input, rated load, 25°C and 70% RH, unless otherwise stated.
Input-to-output withstand voltage 3 kV DC.
Isolation resistance 1000 MΩ.
Isolation capacitance 1000 pF typical.

Mechanical design and installation

Dimensions 50.8 × 25.4 × 11.2 mm (L × W × H).
Case construction Metal case with shielding on all six sides.
Pin assignment 1 +Vin; 2 −Vin; 3 Remote ON/OFF (by request); 4 −Vout; 5 Trim; 6 +Vout. Check the bottom-view orientation before PCB assembly.
Mechanical drawing details Pin diameter 1 ±0.1 mm; lead length 5.8 mm. Recommended PCB hole Ø1.2 mm (+0.2/−0 mm). General drawing tolerance ±0.5 mm.
Unit weight reference 31 g, explicitly stated as a catalog packing reference per unit.
Soldering 3–5 seconds at 265°C maximum, measured 1.5 mm from the case.

EMC and manufacturer references

Safety and catalog references EAC TP TC 020/2011 approved.
EMC emission BS EN/EN 55032 radiated Class A without additional components; Class B with external components. Conducted emission is listed as N/A in the specification.
EMC immunity 8 kV air, Level 3; 4 kV contact, Level 2 under BS EN/EN 61000-4-2; -4-3: 3 V/m, Level 2; -4-4: 0.5 kV, Level 1; -4-5: 0.5 kV line-to-line, Level 2; -4-6: 3 V emf, Level 2; -4-8: 1 A/m, Level 1.
MTBF reference >600 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.
Class B EMC reference circuit F1: 6 A slow-blow fuse; C1: 47 µF/100 V; C2: 2.2 µF/100 V, MLCC 1210; C3/C4: 1000 pF/5 kV MLCC; L1: 325 µH common-mode choke. Follow the complete reference circuit and verify the final equipment.

MEAN WELL SKA20W8 series: Isolated single-output DC-DC converter - SKA20W8-03

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SKA20W8-03 — Isolated single-output DC-DC converter MEAN WELL SKA20W8-03 is an isolated, regulated single-output DC-DC converter accepting 9–75 V DC.... Read more

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    Description

    SKA20W8-03 — Isolated single-output DC-DC converter

    MEAN WELL SKA20W8-03 is an isolated, regulated single-output DC-DC converter accepting 9–75 V DC. It provides 3.3 V DC with 5000 mA. It uses an 8:1 input range and a shielded 2 × 1 inch package; no minimum load is required.

    Download MEAN WELL SKA20W8 Datasheet (PDF)

    Series section: PDF pages 64–71.

    Model and output specifications

    Output voltage 3.3 V DC.
    Rated output current 5000 mA.
    Series power and load limit 20 W series. The stated current limit also applies; do not infer a higher output current from the series wattage.
    Minimum load No minimum load is required.
    Voltage accuracy ±2.0%
    Line regulation ±0.5%; low-to-high input at rated load.
    Load regulation ±1%, measured over 0–100% load.
    Ripple and noise 150 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 PWM typical.
    Maximum capacitive load 1000 µF.

    Input, control and protection

    Input voltage 9–75 V DC; 8:1 range. Nominal inputs listed are 12, 24, 36, 48 and 72 V; specification test input is 24 V.
    Input current 10 mA at no load; 809 mA at full load.
    Typical efficiency 85% at the reference conditions.
    Input filter and fuse Pi filter. The manufacturer recommends a 6 A slow-blow external fuse; select protection for the actual input current and installation.
    Input surge withstand 100 V DC for 100 ms maximum.
    Undervoltage lockout Typical values: start-up 8.8 V; shutdown 7.5 V.
    Overload protection 110–230%; automatic recovery after removal of the fault.
    Short-circuit protection Continuous protection with automatic recovery.
    Output overvoltage protection Clamped by TVS.
    Remote ON/OFF By request; confirm that the supplied configuration includes this function. Referenced to −Vin: >2.5–30 V or open circuit turns the output ON; <1 V or a short circuit turns it OFF.
    Remote-control configuration Although the series overview and mechanical drawing show remote control, the protection specification labels it “By request”. Confirm the ordered configuration before using pin 3.
    Output adjustment Use the single-output external-resistor trim circuit and stay within the rated voltage, current and power limits. Trim to −Vout raises the voltage; Trim to +Vout lowers it.
    Trim reference values Vref 1.24 V; R1 2.43 kΩ; R2 1.47 kΩ; R3 7.5 kΩ. Use the manufacturer’s formulas and the exact model’s pin assignment.

    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 75°C; 50% load at 90°C.
    Maximum case temperature 110°C.
    Working humidity 5–95% RH, non-condensing.
    Storage conditions −55 to +125°C; 10–95% RH, non-condensing.
    Temperature coefficient ±0.03%/°C over 0–80°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 24 V DC input, rated load, 25°C and 70% RH, unless otherwise stated.
    Input-to-output withstand voltage 3 kV DC.
    Isolation resistance 1000 MΩ.
    Isolation capacitance 1000 pF typical.

    Mechanical design and installation

    Dimensions 50.8 × 25.4 × 11.2 mm (L × W × H).
    Case construction Metal case with shielding on all six sides.
    Pin assignment 1 +Vin; 2 −Vin; 3 Remote ON/OFF (by request); 4 −Vout; 5 Trim; 6 +Vout. Check the bottom-view orientation before PCB assembly.
    Mechanical drawing details Pin diameter 1 ±0.1 mm; lead length 5.8 mm. Recommended PCB hole Ø1.2 mm (+0.2/−0 mm). General drawing tolerance ±0.5 mm.
    Unit weight reference 31 g, explicitly stated as a catalog packing reference per unit.
    Soldering 3–5 seconds at 265°C maximum, measured 1.5 mm from the case.

    EMC and manufacturer references

    Safety and catalog references EAC TP TC 020/2011 approved.
    EMC emission BS EN/EN 55032 radiated Class A without additional components; Class B with external components. Conducted emission is listed as N/A in the specification.
    EMC immunity 8 kV air, Level 3; 4 kV contact, Level 2 under BS EN/EN 61000-4-2; -4-3: 3 V/m, Level 2; -4-4: 0.5 kV, Level 1; -4-5: 0.5 kV line-to-line, Level 2; -4-6: 3 V emf, Level 2; -4-8: 1 A/m, Level 1.
    MTBF reference >600 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.
    Class B EMC reference circuit F1: 6 A slow-blow fuse; C1: 47 µF/100 V; C2: 2.2 µF/100 V, MLCC 1210; C3/C4: 1000 pF/5 kV MLCC; L1: 325 µH common-mode choke. Follow the complete reference circuit and verify the final equipment.

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