24V to 12V 85A/100A Buck Converter
- Input Range: 18V – 35V DC
- Output: 12V DC @ 85A/100A
- Peak Power: 1200W Output
- Protection: IP68 Potted Seal
Precision Buck Topologies
High-Efficiency Step-Down Converters for Tartu Applications
Engineered for high conversion efficiency (up to 96%), sub-zero cold start reliability (-40°C), and rugged aluminum die-cast housings for autonomous robotics, heavy equipment, and Baltic renewable grids.
48V to 24V 40A 1000W Buck Module
- Input Range: 30V – 60V DC
- Output: 24V DC @ 40A
- Efficiency: >95.5% Synchronous
- Cooling: Integrated Fin Extrusion
30–60V to 12V 50A/60A Step-Down Unit
- Input Range: 30V – 60V (48V Nominal)
- Output: 12V @ 50A/60A (720W)
- Ripple Noise: < 50mVp-p Low Noise
- Certifications: CE, RoHS, ISO 9001
30–90V to 24V 10A/20A Buck Module
- Input Range: 30V – 90V (48/60/72V)
- Output: 24V DC @ 10A / 20A
- Application: Robotics & AGVs
- Protection: Over-temp, Short-circuit
18–90V to 12V 5A/10A Compact Buck
- Input Window: 18V – 90V DC Continuous
- Output: 12V DC @ 5A / 10A (120W)
- Enclosure: Aluminum Die-Cast IP68
- No-Load Draw: < 15mA Quiescent
Isolated 36–75V to 12V 10A Converter
- Galvanic Isolation: 1500V DC In-to-Out
- Output: 12V DC Regulated @ 10A
- Standard: Telecom Class EN 55032
- Grounding: Break Ground Loop Issues
Isolated 18–75V to 5V 20A 100W Supply
- Input Range: 18V – 75V DC Wide
- Output: 5V DC High Current 20A
- Target: Embedded ARM/PLC Rigs
- Efficiency: Up to 92% Isolated
Smart 36V Lithium Charger / DC Converter
- Conversion: 12V to 43.8V CC/CV Stage
- Max Output: 13A Controlled Output
- Chemistry: LiFePO4 & Ternary Li-ion
- Housing: Waterproof IP65/IP67
500+
Standard Power Modules
ISO 9001
CE & RoHS Certified Plant
5 pcs
Low MOQ for Prototype Testing
130+
Export Destinations Worldwide
Engineering White Paper
Synchronous Rectification & Thermal Management in Sub-Zero Climates
Deploying step-down voltage regulators in Tartu and the broader South Estonian industrial landscape presents a unique set of technical hurdles. Unlike stationary consumer electronics operating in controlled environments, embedded industrial modules deployed across the Baltic region endure severe seasonal thermal cycles, fluctuating from sub-zero winter temperatures as low as -30°C to high-load operational junction temperatures inside sealed aluminum enclosures reaching +85°C.
Traditional non-synchronous buck converters rely on Schottky freewheeling diodes that produce substantial forward voltage drop ($V_f \approx 0.45\text{V} - 0.7\text{V}$). Under sustained heavy-load applications—such as providing 12V at 50A to vehicular auxiliary systems—a standard diode dissipation profile accounts for up to 35W of pure thermal loss. At Shenzhen Eltrum Electronic Co., Ltd., our engineering architecture completely replaces passive freewheeling diodes with high-performance N-channel power MOSFETs operating under advanced micro-controller pulse-width modulation (PWM) synchronous control.
By slashing on-state resistance down to milliohm thresholds ($R_{DS(on)} < 2.5\text{m}\Omega$), conduction losses drop precipitously. Conversion efficiencies routinely exceed 95% to 97%, eliminating runaway heat buildup and ensuring stable gate switching even when cold startup creates gate threshold shifts in silicon semiconductors.
- Thermosetting Epoxy & Silicone Potting: 100% void-free vacuum-encapsulated electronics preventing condensation, frost degradation, and vibration loosening.
- Active Transient Voltage Suppression (TVS): Robust input absorption guarding against alternator load-dump spikes exceeding 100V on heavy machinery lines.
- Ultra-Low Ripple LC Filtering: Multi-stage electrolytic and multilayer ceramic (MLCC) capacitor arrays keeping high-frequency ripple below 30mV RMS.
Eltrum Step-Down Benchmark Specifications
Switching Frequency
120 kHz – 280 kHz
Operating Temperature
-40°C to +85°C Full Load
Dielectric Strength
1500V DC (Isolated)
Peak Efficiency
Up to 96.8% at Full Load
Enclosure Rating
IP68 Waterproof/Dustproof
EMC Compliance
EN 61000-6-2 / EN 55032
Local Ecosystem Deployment
Mission-Critical Applications Across Tartu & Southern Estonia
Tartu serves as the academic, scientific, and technological epicenter of Estonia. Our direct-factory supply model supports local OEMs, academic developers at the University of Tartu Institute of Technology, and automation integrators in Tartu Science Park.
Autonomous Delivery & Mobile Robotics (AMR)
The Estonian robotics ecosystem demands ultra-reliable power stepping from 48V or 72V primary traction battery packs down to regulated 12V and 24V buses. These rails feed LiDAR sensors, stereo navigation cameras, compute platforms, and steering servomotors. Our IP68 synchronous buck converters ensure zero power dropouts even during sudden wheel motor acceleration torque demands.
Smart Forestry & Agricultural Harvesters
Southern Estonia's vast forestry and high-tech farming sectors rely on automated loggers, timber processors, and autonomous tractors. Heavy-duty 24V alternator bus voltages routinely swing from 20V to 32V under varying engine loads. Eltrum step-down voltage regulators lock auxiliary electronics, telemetry tracking systems, and satellite RTK receivers at continuous 12V/13.8V without failure.
Tartu University R&D & Space Technology
Prototyping laboratories at the University of Tartu Delta Centre and Tartu Observatory develop cutting-edge nanosatellite subsystems and atmospheric measurement buoys. Galvanically isolated step-down modules (breaking ground noise loops and providing up to 1500V dielectric isolation) are critical for preventing precision ADC sensor distortion and eliminating conducted ground noise.
Commercial Fleet & EV Bus Auxiliary Power
Tartu has pioneered clean public transportation using biomethane and electric fleet solutions. Converting 48V auxiliary battery banks or high-voltage energy storage systems down to standard passenger 12V charging ports, ticket validation machines, and LED signage requires robust, CE-compliant buck converters with integrated short-circuit and over-current protection.
Baltic Off-Grid Solar & Telecom Base Stations
Estonia's digital infrastructure spans remote wilderness locations powered by off-grid solar-plus-storage stations. Step-down conversion from 48V Telecom lithium banks down to 12V or 24V microwave links and security telemetry operates uninterrupted across dark, freezing winter weeks, drawing virtually zero idle standby power.
Extreme Cold-Environment Marine & River Logistics
Navigating the Emajõgi river and nearby Lake Peipus requires marine navigation electronics, sounders, and radar gear. Potted waterproof aluminum step-down regulators shrug off moisture, spray, and rapid temperature shifts between warm cabins and freezing Baltic waters.
Technical Architecture Matrix
Selecting the Right Step-Down Topology for Your Project
A comprehensive engineering comparison between standard non-isolated synchronous buck converters and galvanically isolated DC-DC step-down power modules.
| Topological Parameter | Synchronous Buck (Non-Isolated) | Transformer-Coupled (Isolated) | Tartu Application Fit |
|---|---|---|---|
| Typical Conversion Efficiency | 94% – 97% (Ultra-Low Loss) | 88% – 92% (Transformer Magnetizing Loss) | Synchronous buck optimal for battery runtime |
| Ground Architecture | Common Ground (In- to Out- Shared) | Fully Galvanically Isolated (1500V DC) | Isolated essential for sensor telemetry & Telecom |
| Physical Form Factor | Ultra-Compact, High Power Density | Slightly Larger (Magnetic Core Volume) | Buck excels in tight robotics & drone payloads |
| Input Voltage Tolerance | Standard Wide (e.g., 18–35V, 30–60V) | Ultra-Wide Dynamic (e.g., 18–90V, 36–75V) | Isolated handles severe high-voltage surges |
| BOM Cost & MOQ | Most Cost-Effective (MOQ 5 pcs) | Engineered Custom Magnetics (MOQ 5–50 pcs) | Sample validation for quick iteration |
| Recommended Local Tartu Use | Heavy Vehicles, AMRs, LED Arrays, Forestry | Scientific Instruments, Satellite Labs, Telecom | Consult Eltrum engineers for layout match |
Tartu Tech Evolution Indicators
- Shift to 48V Architecture: Industrial machinery is transitioning from 12V/24V to 48V LiFePO4 to slash copper harness weight and resistance losses.
- Demand for Embedded Telemetry: Integration of RS485 / CAN bus interfaces directly on voltage converters for real-time voltage/current reporting.
- Hermetic Ingress Standards: Increasing specification of IP67/IP68 potted units to withstand condensation during abrupt thaw cycles in Estonia.
- Strict EU Green Compliance: RoHS, REACH, and CE conformity required for all imported subcomponents into EU manufacturing supply chains.
Local Market Trends
Southern Estonia's Industrial Power Transformation
Estonia has firmly positioned itself as a global powerhouse in digital transformation, software engineering, and hardware robotics. Tartu, home to pioneering robotics startups, autonomous driving trials, and clean energy developers, is experiencing a fundamental transition in how power distribution networks are designed inside commercial hardware.
Engineers across Tartu are systematically abandoning linear regulators and legacy switching power units in favor of high-frequency synchronous DC-DC step-down modules. With the rapid electrification of municipal utility vehicles and agricultural tools, higher primary battery voltages (48V, 72V, and even 96V nominal) are becoming universal. This creates a surging demand for reliable, step-down conversion to safeguard 5V microprocessor systems, 12V instrumentation circuits, and 24V electro-hydraulic actuators.
As Shenzhen Eltrum Electronic Co., Ltd. serves over 130 countries, we maintain dedicated production lines tailored to meet the strict EMC, thermal, and low-quiescent-current demands of European original equipment manufacturers, offering bespoke custom voltage points, cable harness terminations, and customized aluminum heatsink geometries.
Factory Direct Strengths
Why Tartu Engineers Choose Shenzhen Eltrum Electronic
Founded in 2015, Shenzhen Eltrum Electronic Co., Ltd. is an onsite-verified manufacturer specializing in high-reliability power conversion technologies, with rapid European logistics pathways.
ISO 9001:2015 Certified Plant
Our 3,000 m² Shenzhen facility houses high-speed automated SMT placement lines, reflow ovens, and precision selective soldering rigs for high-density magnetic coupling.
100% Full-Load Burn-In Testing
Every single step-down regulator undergoes mandatory high-temperature full-load burn-in screening, thermal imaging inspection, and dielectric withstand validation prior to dispatch.
Agile OEM / ODM Customization
Need non-standard voltages like 13.8V, 15V, 19V, or 28V? We customize switching profiles, PCB layout constraints, and connector configurations starting at low sample quantities.
Reliable EU & Baltic Shipping
Direct courier and air freight shipping directly to Tartu Airport (TAY), Tallinn, or Baltic logistics hubs with transparent Incoterms (DAP, DDP, FOB, EXW) and complete customs documentation.
CE, RoHS & REACH Compliance
Full European compliance documentation, technical files, test reports, and materials declarations readily available to streamline CE marking of your final machinery.
Direct Engineering Support
Collaborate directly with our experienced power electronics design engineers in Shenzhen, bypassing non-technical middlemen for rapid schematic review and troubleshooting.
Procurement & Technical FAQ
Frequently Asked Questions by Tartu Engineers & Buyers
Clear, direct answers regarding minimum orders, cold-weather performance, testing, and European logistics.
What is the Minimum Order Quantity (MOQ) for prototypes and volume production?
To actively encourage engineering R&D at Tartu Science Park and university spinoff laboratories, our standard catalog step-down converters carry an initial MOQ of just 5 units. This enables hardware teams to conduct thermal chamber testing and bench validation before committing to batch runs. For volume series production, scale-tier pricing is available up to tens of thousands of units.
How do your step-down converters perform in -30°C Estonian winters?
All our industrial-grade buck regulators utilize high-stability, cold-rated solid tantalum/ceramic capacitors and selected industrial-grade electrolytic capacitors rated down to -40°C. Standard commercial converters often fail to start up in sub-zero weather due to electrolyte freezing and sudden gate threshold voltage drift; Eltrum modules incorporate wide-temperature reference ICs and fully potted elastic silicone thermally conductive compound to prevent thermal shock stress.
When should our hardware team specify an isolated vs. non-isolated step-down converter?
Use a non-isolated synchronous buck converter when your system shares a common vehicle chassis ground, space is restricted, and maximum conversion efficiency (95–97%) is paramount. Choose a galvanically isolated converter if you are designing sensitive instrumentation, telecommunication systems, or battery management systems where ground loops create noise spikes, or where safety regulations demand 1500V DC electrical separation between input and output rails.
Can you customize output voltages, such as 13.8V for radio systems or 19V for mobile IPCs?
Yes. While standard outputs like 5V, 12V, and 24V are held in continuous buffer stock, Shenzhen Eltrum regularly manufactures customized feedback divider networks to provide stable 9V, 13.8V, 15V, 19V, or 28V outputs. We can also integrate digital RS485 communication protocols (such as on our WG-12C800M series) for telemetry querying of real-time thermal load, output current, and fault logs.
What are the shipping lead times and import procedures for delivery to Tartu, Estonia?
Sample batches are shipped via expedited express air freight (DHL, FedEx, UPS) directly to Tartu with a transit time of 4 to 7 business days. Bulk orders are processed via consolidated air or multimodal freight into Tallinn or European hubs. We provide comprehensive export documentation, including Commercial Invoices with correct HS Codes (8504.40), Packing Lists, and CE Declarations of Conformity to ensure smooth clearance through Estonian Tax and Customs Board (Maksu- ja Tolliamet).
What built-in circuit protections are standard on Eltrum buck regulators?
Every step-down module is equipped with a comprehensive protection suite: Over-Current Protection (hiccup mode or constant current limit with automatic recovery), Over-Voltage Protection via zener/TVS clamping, Short-Circuit Protection (self-healing after fault clearance), Input Reverse Polarity Protection (MOSFET/diode gated), and Thermal Shutdown (engaging when internal junction temperature exceeds +125°C).