MEAN WELL DDRH-45-48DR is an isolated DDRH-45 DC/DC converter in the DR configuration for DIN rail mounting. It provides 48 V at 0.938 A with a 45 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-45 Datasheet (PDF)
The DDRH-45 section is on PDF pages 17, 18, 19, 20, 21, 22, 23, 24. Refer to the complete mechanical drawings and notes when planning installation.
Model and DC Output
| DC output voltage |
48 V |
| Rated output current |
0.938 A |
| Rated output power |
45 W |
| Full model |
DDRH-45-48DR |
| Mounting code |
DR — DIN rail 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 |
938 µF |
| Typical switching frequency |
28–75.6 kHz |
| Minimum hold-up time |
20 ms at 800 VDC input |
| Maximum set-up time |
2 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 |
75 mA |
| Typical efficiency |
86% |
| 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 |
132 VDC |
| Undervoltage shutdown level |
121 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 |
Typical ±0.02%/°C over −40 to +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 |
MIL-STD-810F Table 514.5C-VIII: 15–2000 Hz, 1 hour on each X/Y/Z axis, 3 hours total. |
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 |
135 × 70 × 43.5 mm |
| Installation form |
DIN rail 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 |
310 g; catalogue PACKING reference per unit |
| Admissible DIN rails |
TS35/7.5 or TS35/15 |
| DIN-rail supply |
Rail is shown for reference and is not included with the unit |
| 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 |
The DR version has the illustrated rear DIN-rail clip. Use its numbered terminal drawing for wiring; 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, L2 and L3: three 20 mH common-mode chokes, SQ1515 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 22 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 |
316 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 |
2.03 kg |
| One carton gross mass |
7.1 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.
