MEAN WELL SD-15A-24 is an enclosed, isolated single-output DC/DC converter delivering 24 V at up to 0.625 A, with a rated output of 15 W. The A-input version accepts 9.2–18 VDC. Its fanless metal enclosure uses free-air convection, with model-specific temperature derating and screw-terminal connections.
Product Datasheet
Download MEAN WELL SD-15 Datasheet (PDF)
The SD-15 section is on PDF pages 1, 2. Refer to the complete mechanical drawings and notes when planning installation.
Model and DC Output
| Full model |
SD-15A-24 |
| Series |
SD-15 |
| Input version |
A: 9.2–18 VDC |
| Output code |
24: 24 VDC |
| DC output voltage |
24 V |
| Rated output current |
0.625 A |
| Rated output power |
15 W |
| Output current range |
0–0.625 A |
| Output voltage adjustment |
21.6–26.4 V |
| Maximum ripple and noise |
150 mVp-p |
| Voltage tolerance |
±1.0% |
| Line regulation |
±0.2% |
| Load regulation |
±0.2% |
Input and Conversion Characteristics
| Permitted input voltage |
9.2–18 VDC |
| Typical efficiency |
70% |
| Typical DC input current |
1.9 A at 12 VDC |
| Cooling |
Free-air convection; fanless |
| Input filtering |
Built-in EMI filter |
| Catalogue input-range feature |
2:1 wide input range |
| Set-up / rise time at full load |
2.5 s / 25 ms at 12 VDC |
| Factory screening |
100% full-load burn-in test |
Unless otherwise specified, the catalogue parameters use 12 VDC input, rated load and 25°C ambient. Select the input version before wiring; the input range is specific to the letter in the complete model number.
Ripple and noise are measured with 20 MHz bandwidth using a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Protection
| Short-circuit protection |
Included |
| Overload threshold |
105–160% of rated output power |
| Overload response |
Hiccup mode; automatic recovery after the fault is removed |
| Overvoltage threshold |
27.6–32.4 V |
| Overvoltage response |
Output shutdown with zener-diode clamping |
Operate within both the output current and output power ratings; the overload threshold is a protection characteristic, not a continuous or timed peak-output rating.
Environment and Derating
| Working ambient temperature |
−10 to +60°C, subject to derating |
| Working humidity |
20–90% RH, non-condensing |
| Storage temperature / humidity |
−20 to +85°C / 10–95% RH |
| Temperature coefficient |
±0.03%/°C over 0–50°C |
| Vibration |
10–500 Hz; 2 G; 10 min/cycle; 60 min along each X, Y and Z axis |
The curve permits 80% load at −10°C, rising to 100% at 0°C. Full load is shown through 40°C, then derating to 60% at 60°C with horizontal mounting or 55°C with vertical mounting.
Observe the corresponding horizontal/vertical curve when positioning the enclosure. The operating-temperature range does not mean full output is available at every temperature.
For fanless operation above 2000 m altitude, the catalogue note reduces the allowable ambient temperature by 3.5°C per additional 1000 m. This derating note does not independently specify a maximum installation altitude.
Mechanical Details and Terminal Connections
| Dimensions, L × W × H |
78 × 51 × 28 mm |
| Mechanical drawing reference |
Case No. 931A; dimensions in mm, general tolerance ±1 mm |
| Unit mass |
180 g; catalogue PACKING reference per unit |
| Nominal switching frequency in block diagram |
96 kHz |
| Terminal 1 |
DC input V+ |
| Terminal 2 |
DC input V− |
| Terminal 3 |
FG / chassis ground |
| Terminal 4 |
DC output +V |
| Terminal 5 |
DC output −V |
The drawing identifies two bottom M3 positions with L = 3 mm and two side M3 positions with L = 6 mm. Follow the drawing for the applicable mounting location; these length marks are specific to the indicated positions.
Wire the numbered terminals according to this model-specific assignment, including the FG/chassis terminal. Maintain free-air convection around the enclosure. Use the output-voltage adjuster only within the specified adjustment range.
The catalogue mechanical pages specify the enclosure and screw-terminal connections. No separately orderable model-specific cable, terminal housing or mounting accessory is identified on these series pages.
Safety, EMC and Reliability
| Catalogue safety / design references |
EAC TP TC 004 approved; design reference to AS/NZS 62368.1 |
| Withstand voltage, input to output |
1.5 kVAC |
| Withstand voltage, input to FG |
1 kVAC |
| Withstand voltage, output to FG |
0.5 kVAC |
| Insulation resistance |
100 MΩ at 500 VDC, 25°C and 70% RH; input–output, input–FG and output–FG |
| EMC emission references |
BS EN/EN 55032 (CISPR 32); EAC TP TC 020 |
| EMC immunity references |
BS EN/EN 61000-4-2, -3, -4, -6 and -8; BS EN/EN 55035; EAC TP TC 020 |
| EMC environment in catalogue |
Light industry |
| MTBF, Telcordia SR-332 |
3861.2 thousand hours minimum |
| MTBF, MIL-HDBK-217F |
644.2 thousand hours minimum at 25°C |
| Catalogue warranty period |
2 years; subject to manufacturer terms |
Design references and the catalogue approval statements have different meanings. The converter is a component for installation in end equipment; these references do not certify the completed system.
The EMC test arrangement mounts the converter on a 360 × 360 × 1 mm metal plate. The manufacturer requires EMC compliance to be reconfirmed in the completed installation. MTBF figures are reliability calculations, not a service-life guarantee.
