MEAN WELL DDRH-15-24ST is an isolated DDRH-15 DC/DC converter in the ST configuration for screw-terminal mounting. It provides 24 V at 0.625 A with a 15 W rated output from a 150–1500 VDC input. Reinforced 4 kVAC input-to-output isolation, full encapsulation and fanless convection cooling suit auxiliary supplies in photovoltaic, energy-storage, industrial-control and other high-voltage DC-bus equipment.
Product Datasheet
Download MEAN WELL DDRH-15 Datasheet (PDF)
The DDRH-15 section is on PDF pages 1, 2, 3, 4, 5, 6, 7, 8. Refer to the complete mechanical drawings and notes when planning installation.
Model and DC Output
| DC output voltage |
24 V |
| Rated output current |
0.625 A |
| Rated output power |
15 W |
| Full model |
DDRH-15-24ST |
| Mounting code |
ST — Screw-terminal mounting |
| Voltage accuracy |
±2.0% |
| Ripple and noise |
150 mVp-p |
| Line regulation |
±1% |
| Load regulation |
±1% from 10% to full load |
| Maximum capacitive load |
625 µF |
| Typical switching frequency |
25–75.6 kHz |
| Minimum hold-up time |
16 ms at 800 VDC input |
| Maximum set-up time |
1 s over 150–1500 VDC input |
Unless stated otherwise, specifications apply at 800 VDC input, rated load and 25°C ambient. Ripple and noise are measured with a 20 MHz bandwidth and a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors.
DC Input and Efficiency
| DC input range |
150–1500 VDC |
| Nominal input voltage |
800 VDC |
| Input range ratio |
10:1 |
| No-load input current |
0.2 mA |
| Full-load input current |
30 mA |
| Typical efficiency |
88% |
| Cold-start inrush current |
150 A maximum at 800 VDC input |
| Input filter |
Internal capacitor |
Protection Functions
| Short-circuit protection |
Continuous hiccup mode with automatic recovery |
| Overload threshold |
110–300% of rated output power |
| Overload recovery |
Hiccup mode; automatic recovery after the fault is removed |
| Overvoltage protection |
Hiccup mode; automatic recovery after the fault is removed |
| Reverse-input polarity protection |
Internal bridge diode; no damage and automatic recovery after the fault is removed |
| Undervoltage start-up level |
147 VDC |
| Undervoltage shutdown level |
137 VDC |
The undervoltage lockout levels describe start-up and shutdown behavior. Normal operation remains specified over the 150–1500 VDC input range.
Environment and Load Derating
| Cooling |
Fanless, free-air convection |
| Operating temperature |
−40 to +80°C, subject to load derating |
| Vertical thermal load limits |
100% from −40 to +50°C; 75% at 60°C; 50% at 70°C; 25% at 80°C |
| Operating humidity |
20–90% RH, non-condensing |
| Storage conditions |
−40 to +85°C; 10–95% RH, non-condensing |
| Temperature coefficient |
±0.02%/°C over 0–50°C |
| Operating altitude |
Up to 5000 m |
| Altitude derating |
Reduce the allowable ambient temperature by 3.5°C per 1000 m above 2000 m for this fanless converter |
| Vibration |
Component: 10–500 Hz, 3 G, 10 minutes per cycle, 60 minutes on each X/Y/Z axis. Mounting clip: IEC60068-2-6. |
Use the vertical derating curve between the plotted points. Full output is not available throughout the complete ambient-temperature range.
Dimensions, Installation and Connections
| Dimensions, L × W × H |
122.3 × 57.3 × 32 mm |
| Installation form |
Screw-terminal mounting |
| Case material |
Non-conductive black plastic, UL 94V-0 rated |
| Encapsulation |
Fully encapsulated; potting material rated UL 94V-0 |
| Pin material |
Copper base with matte-tin plating |
| Unit mass |
210 g; catalogue PACKING reference per unit |
| Mounting holes |
Four holes, 3.2 mm diameter |
| Mounting-hole centre spacing |
107.3 × 39.3 mm |
| Terminal wire size |
12–24 AWG |
| Recommended terminal torque |
5 kgf-cm (4.4 lb-in) |
| Terminal 1 |
−Vin |
| Terminal 2 |
NC |
| Terminal 3 |
+Vin |
| Terminal 4 |
+Vout |
| Terminal 5 |
−Vout |
Use the screw-terminal drawing for the numbered input and output connections. NC is a no-connection terminal.
Required Input Fuse and EMC Components
| Required external input fuse |
4 A / 1500 VDC |
| Suggested fuse-and-holder ordering code |
WJ30-4_WJ30-H |
| Fuse manufacturer |
WalterFuse |
| Fuse part number |
WJ30-4 |
| Fuse-holder part number |
WJ30-H |
| External EMC chokes |
L1 and L2: two 25 mH common-mode chokes, SQ1212 reference |
| External EMC capacitors |
C1 and C2: 0.33 µF / 1500 VDC each |
| External EMC resistors |
R1 and R2: 3 MΩ, 1/2 W, voltage rating at least 800 V each |
An external input fuse is required. The suggested WalterFuse WJ30-4 fuse and WJ30-H holder can be ordered as WJ30-4_WJ30-H using the catalogue ordering reference. This external assembly is selected separately from the converter; the listed converter mass does not include it.
The suggested circuit on physical PDF page 6 places the fuse in the positive input lead and adds the listed chokes, capacitors and resistors. Conducted and radiated Class A performance is specified with these external components. Follow that circuit for this family and confirm EMC in the completed equipment.
Safety, EMC and Reliability
| Input-to-output isolation |
4 kVAC, reinforced isolation |
| Insulation resistance |
100 MΩ between input and output, measured at 500 VDC, 25°C and 70% RH |
| Overvoltage category |
Category II according to EN62109-1, up to 5000 m altitude |
| Catalogue safety approvals |
UL1741; CSA C22.2 No.107.1-16; IEC62109-1 (LVD); EAC TP TC 004 |
| Conducted and radiated emissions |
BS EN/EN55032 Class A with external components |
| Immunity standard |
BS EN/EN55035 |
| ESD, BS EN/EN61000-4-2 |
8 kV air (Level 3), 4 kV contact (Level 2); criterion A |
| Radiated susceptibility, BS EN/EN61000-4-3 |
Level 3, 10 V as listed in the catalogue; criterion A |
| EFT / bursts, BS EN/EN61000-4-4 |
Level 2, 0.5 kV; criterion A |
| Surge, BS EN/EN61000-4-5 |
Level 4, 2 kV between Vin+ and Vin−; criterion A |
| Conducted immunity, BS EN/EN61000-4-6 |
Level 3, 10 V; criterion A |
| MTBF |
388 kh, MIL-HDBK-217F at 25°C |
| Catalogue warranty |
3 years |
This converter is a component for integration into final equipment. The finished equipment must be checked again for compliance with EMC directives; component approvals do not establish approval of the complete installation.
Packing References
| Catalogue packing quantity |
6 pieces per tray; 18 pieces per carton |
| One tray gross mass |
1.43 kg |
| One carton gross mass |
5.3 kg |
| Catalogue carton dimensions, L × W × H |
400 × 320 × 225 mm |
The packing quantities and gross masses are logistics references, separate from the per-unit mass above; they do not define the sales quantity of this individual model. The catalogue illustrates antistatic plastic blister packing with antistatic foam.
