DDR Series DDR-120A-48 Power Supply - DC to DC Converter

Overview

DDR-120A-48 is the 48V output model of this series: rated current 2.1A, rated power 100.8W, typical efficiency 88.5%.

DDR-120 series is a 120W DIN Rail type DC-DC converter with main features including DIN rail-type easy installation, ultra slim width (32mm), 2:1 wide input voltage, fanless design, -40~+70℃ wide operating temperature, 4KVdc I/O isolation, 150% peak load, adjustable output voltage and full protective functions. This series of models has various input options: 9~18V / 16.8~33.6V / 33.6~67.2V / 67.2~154V and various output options: 12V / 24V / 48V and can be used for industrial & railway control, security control, communication system and other fields. Suitable applications include DC buck/boost regulator, increasing system insulation level and voltage drop compensation along cable...etc.

Features

Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standard
Width only 32mm
2:1 wide input range
-40~+70℃ wide working temperature
150% peak load capability
DC output adjustable
Cooling by free air convection
Can be installed on DIN rail TS-35/7.5 or 15
Protections: Short circuit / Overload / Over voltage / Input reverse polarity / Input under voltage protection
4KVdc I/O isolation(Reinforced isolation)
Conformal coating
3 years warranty

Specifications

DDR-120A-48Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 48V
RATED CURRENT: 2.1A
CURRENT RANGE: 0 ~ 2.1A
RATED POWER: 100.8W
PEAK CURRENT: 3.15A
PEAK POWER^Note.5: 150W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 50mVp-p
VOLTAGE ADJ. RANGE: 48 ~ 56V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 500ms, 60ms @12Vdc
HOLD UP TIME (Typ.): Please refer to page 7 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE^Note.4: 9 ~ 18Vdc
EFFICIENCY (Typ.): 88.5%
DC CURRENT (Typ.): 11.2A @12Vdc
INRUSH CURRENT (Typ.): 5A @12Vdc
INTERRUPTION OF VOLTAGE SUPPLY: EN50155:2021-comply with S1 level

PROTECTION

OVERLOAD: Normally works within 150% rated output power for more than 3 seconds and then constant current protection 105~135% rated output power with auto-recovery
OVER VOLTAGE: 57.6 ~ 67.2V Protection type : Shut down o/p voltage, re-power on to recover
REVERSE POLARITY: By internal MOSFET, no damage, recovers automatically after fault condition removed
UNDER VOLTAGE LOCKOUT: 12Vin (A - type) :Power ON≥9V , OFF≤8.5V

ENVIRONMENT

WORKING TEMP.: -40 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 5 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 5 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 55℃)
VIBRATION: Component:10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes; Mounting: Compliance to IEC61373
OPERATING ALTITUDE: 5000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC 62368-1, UL 62368-1, EAC TP TC 004, AS/NZS 62368.1 approved; Design refer to UL508
WITHSTAND VOLTAGE: I/P-O/P:4KVdc I/P-FG:2.5KVdc O/P-FG:2.5KVdc
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG:>100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION^{Note 6}: Parameter Standard Test Level

Conducted BS EN/EN55032 Class B
Radiated BS EN/EN55032 Class B
Voltage Flicker BS EN/EN61000-3-3 -----
Harmonic Current ----- -----
EMC IMMUNITY^{Note 6}: BS EN/EN55035 , BS EN/EN61000-6-2(BS EN/EN50082-2)

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 3, 6KV contact; criteria A
Radiated BS EN/EN61000-4-3 Level 3, 10V/m; criteria A
EFT / Burst BS EN/EN61000-4-4 Level 3, 2KV; criteria A
Surge BS EN/EN61000-4-5 Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-FG ;criteria A
Conducted BS EN/EN61000-4-6 Level 3, 10V; criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m; criteria A
RAILWAY STANDARD: Compliance to BS EN/EN45545-2 for fire protection ; Meet BS EN/EN50155 / IEC60571 including IEC61373 for shock & vibration, BS EN/EN50121-3-2 for EMC (except for 9~18Vin)

Parameter	Standard	Test Level
Conducted	BS EN/EN55032	Class B
Radiated	BS EN/EN55032	Class B
Voltage Flicker	BS EN/EN61000-3-3	-----
Harmonic Current	-----	-----

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 3, 6KV contact; criteria A
Radiated	BS EN/EN61000-4-3	Level 3, 10V/m; criteria A
EFT / Burst	BS EN/EN61000-4-4	Level 3, 2KV; criteria A
Surge	BS EN/EN61000-4-5	Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-FG ;criteria A
Conducted	BS EN/EN61000-4-6	Level 3, 10V; criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A/m; criteria A

OTHERS

MTBF: 1769.5K hrs min. Telcordia SR-332 (Bellcore) ; 214.5K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 32*125.2*102mm (W*H*D)
PACKING: 510g; 28pcs/15.3Kg/1.23CUFT

Test conditions and notes7

1. All parameters NOT specially mentioned are measured at normal input (A:12Vdc , B:24Vdc) , rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Derating may be needed under low input voltage. Please check the derating curve for more details.
5. 3 seconds max., please refer to peak loading curves.
6. The power supply is considered as an independent unit, but the final equipment still need to re-confirm that the whole system complies with the EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )
7. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).

Technical drawings

DDR-120A-48 Block Diagram — Block Diagram

DDR-120A-48 Derating Curve — Derating Curve

DDR-120A-48 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-120A-48 Inrush Current — Inrush Current

DDR-120A-48 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-120A-48 D D R - 1 2 0 series — D D R - 1 2 0 series

DDR-120A-48 Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Certificates2

CE Certificate(DDR-120)(EN) PDF Download

EMC Certificate(DDR-120)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the DDR-120A-48 to supply 48V PoE switches from a 12V battery system?

Yes. The DDR-120A-48 accepts 9–18V DC input and delivers 48V at up to 2.1A (100.8W). This is enough to power a small PoE switch for IP cameras or wireless access points in a battery-backed installation such as a mobile command post or off-grid telecom shelter.

Is this converter suitable for generating a 48V bus for telecom equipment in a remote site?

The DDR-120A-48 can convert a low-voltage 9–18V DC source to a 48V nominal telecom bus at up to 2.1A. Its -40°C to +70°C operating range (with derating per the derating curve) and 1769.5K hours minimum MTBF (Telcordia SR-332) make it well suited for unattended remote telecom cabinets where maintenance access is limited.

Can I power 48V DC motor drives with the DDR-120A-48?

The DDR-120A-48 provides 48V at up to 2.1A (100.8W), which can work for small 48V DC motors or motor controllers that stay within that power envelope. Be aware that motor inrush currents can exceed steady-state draw, so verify that peak demands do not exceed the converter's output capability.

Can the DDR-120A-48 handle high-humidity environments inside a marine or coastal enclosure?

The DDR-120A-48 is rated for 5–95% RH non-condensing and -40°C to +70°C operation, and the series passed EN 50155 damp heat and salt mist tests, but the datasheet states no IP rating for the unit itself. For marine or coastal installations, mount it inside a sealed, suitably rated cabinet to protect against condensation and corrosion.

Is the DDR-120A-48 a good fit for powering 48V LED lighting arrays from a vehicle battery?

It can convert a 12V nominal vehicle battery (within the 9–18V input range) to 48V for LED drivers or lighting strips. At 100.8W total output, it supports moderate lighting loads. The slim DIN rail form factor makes it easy to integrate into vehicle electrical panels.

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Model	Power	Voltage	Current	IP Rating
Mean Well DDR-120A-24 DC-DC Converter - 100.8W - 9~18V in 24V out 4.2A	100.8W	24V	4.2A	IP20	View
Mean Well DDR-120A-12 DC-DC Converter - 99.6W - 9~18V in 12V out 8.3A	99.6W	12V	8.3A	IP20	View

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Mean Well DDR-120A-48 DC-DC Converter - 100.8W - 9~18V in 48V out 2.1A

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Overview

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Specifications

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INPUT

PROTECTION

ENVIRONMENT

SAFETY & EMC

OTHERS

Technical drawings

Typical applications

Downloads

Certificates2

Catalogues2

FAQ

Payment & Security

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Mean Well DDR-120A-48 DC-DC Converter - 100.8W - 9~18V in 48V out 2.1A

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