Leyu provides industrial DC-DC converters designed to convert a varying DC input source into a stable regulated DC output for industrial equipment, battery-powered systems, communication devices, vehicle-mounted equipment and other DC power applications.
The SD Series includes 50W, 100W and higher-power 350W-class DC-DC converters, with wide input ranges designed for nominal 12V, 24V, 48V and higher-voltage DC systems.
Depending on the model, available output options include 5V, 12V, 24V and 48V DC, while isolated input-to-output designs help separate the source and load sides electrically.
Choose the correct DC-DC converter according to your actual input voltage range, required output voltage, load current, power level, isolation requirements and operating environment.
Series | Power Level | Typical Input Range Options | Output Options | Cooling |
|---|---|---|---|---|
SD-50 | 50W class | 9.2–18V, 19–36V, 36–72V DC | 5V / 12V / 24V | Natural convection |
SD-100 | 100W class | 9.2–18V, 19–36V, 36–72V, 72–144V DC | 5V / 12V / 24V / 48V | Natural convection |
SD-350 | Up to 350W class | 19–36V, 36–72V, 72–144V DC | 5V / 12V / 24V / 48V | Built-in fan |
Use this table as an initial selection guide. Final model selection should always be based on the full electrical and environmental specifications.
The SD-50 Series is designed for lower-power DC conversion applications where compact size and natural convection cooling are preferred.
Different input versions are available for nominal 12V, 24V and 48V DC systems, with selected output options including 5V, 12V and 24V.
Suitable for:
Battery-powered equipment
Solar-powered control systems
Vehicle auxiliary equipment
Communication devices
Compact industrial systems
The SD-100 Series provides a wider range of input and output configurations for industrial systems requiring approximately 100W of regulated DC power.
Input options cover nominal 12V, 24V, 48V and higher-voltage DC sources, while output configurations include 5V, 12V, 24V and 48V DC depending on the model.
Suitable for:
Industrial automation
Telecom equipment
Battery systems
Monitoring equipment
Communication systems
Transportation electronics
The SD-350 Series is designed for higher-power DC loads requiring wide input capability, electrical isolation and active thermal management.
Selected models cover input ranges from 19–36VDC up to 72–144VDC and provide regulated 5V, 12V, 24V or 48V outputs depending on configuration.
Built-in fan cooling supports applications with higher continuous power demand.
Suitable for:
High-power industrial equipment
Telecom systems
Vehicle-mounted electronics
Railway and transportation systems
Remote DC-powered equipment
The actual DC input range is one of the most important specifications when selecting a converter.
A converter with an input range such as:
9.2–18VDC
can accommodate voltage variation around a nominal 12V DC source.
This may be suitable for:
12V battery systems
Vehicle electronics
Portable DC equipment
A 19–36VDC input range is suitable for many nominal 24V DC systems.
Possible applications include:
Battery-powered industrial equipment
Solar battery systems
Vehicle-mounted equipment
Control systems
This range allows the converter to continue operating even when the DC source does not remain at exactly 24V.
A 36–72VDC input range can support systems built around a nominal 48V DC bus.
Typical applications include:
Telecom equipment
Communication systems
Industrial DC distribution
Battery-powered control systems
Selected SD-100 and SD-350 configurations support input ranges such as:
72–144VDC
for industrial and transportation systems using higher DC bus voltages.
Always confirm both the minimum and maximum possible source voltage before selecting a converter.
A 2:1 wide input DC-DC converter can operate across a relatively broad DC input voltage range instead of requiring one fixed input voltage.
For example:
19–36VDC Input
is designed around a nominal 24V system but can continue operating as the actual source voltage changes within the specified range.
This is particularly useful because DC sources are rarely perfectly constant.
Voltage may change because of:
Battery charging and discharging
Vehicle alternator operation
Solar battery conditions
Industrial DC bus variation
Telecom battery operation
When selecting a converter, use the actual minimum and maximum input voltage, not only the nominal system voltage.
An isolated DC-DC converter provides electrical separation between the input source and the regulated output.
Selected Leyu SD Series models provide input-to-output isolation for industrial applications where electrical separation can improve system design.
Isolation may help with:
Different parts of an electrical system may use different ground references.
Electrical isolation can help prevent unwanted current paths between the source and load sides.
Switching equipment, batteries, motors and other electrical loads can introduce noise into a DC system.
An isolated converter can help separate the input and output power domains.
Electrical isolation adds separation between upstream and downstream circuits, which may be important in industrial, communication and transportation equipment.
Some systems require the DC load to operate independently from the source-side ground.
In these applications, an isolated converter may be more appropriate than a non-isolated voltage regulator.
Always confirm the isolation rating required by your system before final product selection.
Suitable for selected:
Digital electronics
Control boards
Communication modules
Low-voltage circuits
Commonly used for:
Vehicle accessories
Monitoring systems
Electronic devices
Auxiliary DC equipment
Suitable for many industrial applications, including:
Controllers
Automation equipment
Communication systems
DC-powered industrial devices
Selected SD-100 and SD-350 models provide 48V output for higher-voltage DC equipment and communication systems.
The output voltage must always match the electrical requirements of the connected load.
A DC-DC converter and an AC-DC power supply serve different input power systems.
Feature | DC-DC Converter | AC-DC Power Supply |
Input | DC voltage | AC mains |
Output | Regulated DC | Regulated DC |
Typical Source | Battery, vehicle, telecom DC bus | Utility AC power |
Wide DC Input | Common | Not applicable |
Isolation | Available depending on design | Available depending on design |
Typical Applications | Vehicles, batteries, telecom, transportation | Machinery, automation, general electrical equipment |
Choose a DC-DC converter when your power source is already DC.
If the equipment will be powered directly from AC mains, explore our Single Output Power Supply range.
Start by determining where the input power comes from.
Typical sources include:
12V battery
24V battery
48V telecom bus
Vehicle electrical system
Solar battery system
Industrial DC bus
Do not select a converter using nominal voltage alone.
For example, a nominal 24V source may vary significantly during charging, discharging or load changes.
Identify:
Minimum Input Voltage: ___ VDC
Maximum Input Voltage: ___ VDC
Then select a converter that can operate throughout this range.
Determine whether the connected equipment requires:
5V
12V
24V
48V
or another DC output.
The converter output must match the load specification.
Determine the maximum load current.
A basic calculation is:
Output Power (W) = Output Voltage (V) × Output Current (A)
For example:
24V × 4A = 96W
A 100W-class converter may therefore be considered, subject to operating temperature, peak load and derating requirements.
Determine whether the application requires electrical separation between the input and output.
Isolation is particularly important to evaluate in:
Telecom systems
Industrial control systems
Vehicle equipment
Transportation systems
Equipment with different ground references
Cooling requirements increase as converter power increases.
Lower-power models may rely on natural convection, while higher-power units may use fan-assisted cooling.
Always check:
Ambient temperature
Airflow
Installation clearance
Derating requirements
Nearby heat sources
Depending on the model, DC-DC converters may include functions such as:
Short-circuit protection
Overload protection
Over-voltage protection
Over-temperature protection
Protection features vary by product and should be confirmed on the individual datasheet.
Sensitive communication, control and measurement equipment may require closer attention to:
Output ripple
Electrical noise
EMI performance
Grounding
Cable routing
Confirm these requirements during system design.
Battery voltage changes during charging and discharging.
A wide-input DC-DC converter can provide a more stable regulated voltage to downstream equipment.
Vehicles and mobile equipment may operate from 12V, 24V or other DC electrical systems.
DC-DC converters can supply the regulated voltage required by communication, control or monitoring equipment.
Telecom equipment often operates from DC distribution systems such as nominal 48V buses.
An isolated converter can provide the voltage required by downstream communication devices while separating different power domains.
Industrial systems may contain internal DC buses that need to be converted into different regulated voltages for controllers, sensors and auxiliary equipment.
Transportation equipment can use higher-voltage DC power architectures and may require isolated conversion for onboard electronic systems.
Battery-based solar systems can experience significant DC voltage variation.
Wide-input DC-DC converters can support suitable loads where a regulated downstream voltage is required.
For reliable operation, consider more than electrical voltage alone.
Use cable size appropriate for the converter input current and cable length.
Low-voltage, high-current systems can experience significant voltage drop if wiring is undersized.
Keep output wiring suitable for the connected current and equipment installation.
Do not block cooling airflow, especially on higher-power fan-cooled models.
Follow the grounding and isolation instructions for the selected converter.
Depending on the application, suitable input fusing or external circuit protection may be required.
Refer to the technical documentation for the selected model before final installation.
For applications where a standard SD Series configuration does not fully match your requirements, Leyu can evaluate OEM or ODM specifications.
Please provide:
Nominal input voltage
Minimum input voltage
Maximum input voltage
Required output voltage
Output current
Required power
Isolation requirement
Application
Operating temperature
Product dimensions
Installation requirements
Estimated quantity
Providing the complete input voltage range is especially important for battery, vehicle and telecom applications.
Power Supply
Browse the complete Leyu power supply range.
Single Output Power Supply
For equipment powered from AC mains requiring one regulated DC output.
Multiple Output Power Supply
For AC-powered systems requiring two or more DC output rails.
DIN Rail Power Supply
For industrial control cabinets and DIN rail installations.
UPS Power Supplies & Battery Chargers
For DC loads requiring battery charging and backup capability.
Waterproof Switching Power Supply
For outdoor or moisture-exposed AC-DC power applications.
A DC-DC converter takes an existing DC input voltage and converts it into a regulated DC output voltage required by the connected equipment. It is commonly used with batteries, vehicles, telecom DC buses and industrial DC systems.
A 2:1 input range allows a DC-DC converter to operate across a relatively wide input voltage window. For example, a 19–36VDC model can support voltage variation around a nominal 24V DC system.
An isolated DC-DC converter electrically separates the input and output sides. This can help with ground separation, noise control and system protection in suitable industrial, telecom and transportation applications.
Choose according to the actual voltage range of your DC source. Do not rely only on nominal voltage. Measure or calculate the minimum and maximum voltage that the battery, vehicle or DC bus can produce during operation.
A DC-DC converter uses a DC input source such as a battery or DC bus. An AC-DC power supply takes utility AC input and converts it into regulated DC power.
For faster model selection, send us the actual electrical requirements of your DC system.
Our team can help evaluate a suitable SD-50, SD-100 or SD-350 Series DC-DC converter according to your input range, output and power requirements.
