The Ebyte BDM41 series is an industrial 30W/40W isolated DC-DC converter module featuring ultra-wide 4:1 input (9-36VDC), regulated 5V/12V/24V outputs up to 8000mA, 2000VDC isolation, up to 87.5% efficiency, SSR secondary-side feedback, and DIP through-hole packaging for railway, instrumentation, RF communications, and smart grid automation.
Key Features & Advantages
- Ultra-Wide 4:1 Input Voltage Range (9 ~ 36VDC): Natively accommodates standard 12V and 24V industrial DC bus fluctuations and battery discharge profiles without requiring front-end pre-regulation.
- High 2000VDC Galvanic Isolation & SSR Secondary-Side Feedback: Delivers 2000VDC dielectric withstand voltage between input and output, cutting ground loops and suppressing high-voltage transient surges while maintaining tight +/-3% output regulation.
- Continuous Short-Circuit & Over-Current Self-Recovery Protection: Features robust hiccup-mode over-current (110%~150% Io) and continuous output short-circuit protection with automatic self-recovery to protect sensitive downstream loads.
- High Efficiency up to 87.5% & Industrial DIP Package: Operates with low internal power dissipation and natural air convection cooling across wide -40 to +85 deg C temperatures, equipped with an external TRIM pin for precise voltage calibration.
Core Specifications
| Parameter | Specification / Value |
|---|---|
| Input Voltage Range | 9 ~ 36 VDC (Nominal 24 VDC, 4:1 Ultra-Wide Range) |
| Output Power Rating | 30 Watts (BDM41-30W Series) / 40 Watts (BDM41-40W Series) |
| Output Voltage Options | 5 VDC, 12 VDC, 24 VDC (Single Regulated Output) |
| Isolation Voltage | 2000 VDC (Input to Output, 1 Minute Test) |
| Maximum Efficiency | 85.8% (12V Output) ~ 87.5% (24V Output) |
| Output Ripple & Noise | Less than 100 mVp-p (20MHz Bandwidth) |
| Switching Frequency | 320 kHz Typical |
| Protections | Over-Current Protection (110%-150% Io), Continuous Short-Circuit (Self-Recovery) |
| Operating Temperature | -40 deg C to +85 deg C (Natural Air Convection Cooling) |
| Package & Dimensions | DIP Through-Hole (Plastic Encapsulated), 52.57 * 35.2 * 25.6 mm, 70 +/- 5 g |
Product Selection Guide
Notice for Selection: Choose between 30W (BDM41-30W) and 40W (BDM41-40W) power ratings according to your total system load requirements, then select the corresponding output voltage (5V, 12V, or 24V DC). Ensure an external 50VDC 8A slow-blow fuse is connected to the positive input rail for circuit protection.
| Model SKU | Rated Power | Input Voltage | Output Voltage | Output Current | Max Efficiency | Package Dimensions |
|---|---|---|---|---|---|---|
| BDM41-30W24S05G2 | 30 Watts | 9 ~ 36 VDC | 5 VDC | 6000 mA | 86.0% | 52.57 * 35.2 * 25.6 mm |
| BDM41-30W24S12G2 | 30 Watts | 9 ~ 36 VDC | 12 VDC | 2500 mA | 85.8% | 52.57 * 35.2 * 25.6 mm |
| BDM41-30W24S24G2 | 30 Watts | 9 ~ 36 VDC | 24 VDC | 1250 mA | 87.5% | 52.57 * 35.2 * 25.6 mm |
| BDM41-40W24S05G2 | 40 Watts | 9 ~ 36 VDC | 5 VDC | 8000 mA | 86.0% | 52.57 * 35.2 * 25.6 mm |
| BDM41-40W24S12G2 | 40 Watts | 9 ~ 36 VDC | 12 VDC | 3333 mA | 85.8% | 52.57 * 35.2 * 25.6 mm |
| BDM41-40W24S24G2 | 40 Watts | 9 ~ 36 VDC | 24 VDC | 1666 mA | 87.5% | 52.57 * 35.2 * 25.6 mm |
Industrial Installation & Wiring
The BDM41 series power module is encapsulated in an industrial flame-retardant plastic DIP housing with standard through-hole solder pins (52.57 * 35.2 * 25.6 mm). Input power connects to VCC1 (Pins 8, 9) and GND1 (Pins 4, 5). Regulated output power is delivered across VCC2 (Pins 10, 11, 12, 13) and GND2 (Pins 15, 16, 17, 18). Critical Safety Note: GND1 (input ground) and GND2 (output ground) must remain completely galvanically isolated and never connected together on the PCB to preserve 2000VDC isolation. Pin 14 (TRIM) allows fine output voltage adjustment using external trim resistors. Pin 1 (CTRL) provides remote on/off control. For circuit safety, an external 50VDC 8A slow-blow fuse must be installed in series on the positive input line.
Practical Application Scenarios
1. Industrial PLC Controller & Distributed I/O Isolated Power
In factory automation cabinets, 24V DC field supply rails carry heavy inductive switching transients from large contactors and solenoid valves. Integrating the BDM41 series DC-DC converter steps down and isolates 24V bus power into clean, regulated 5V or 12V rails for microcontrollers, optocouplers, and ADC converters, safeguarding delicate digital circuitry from common-mode electrical noise.
2. Railway Signaling & Onboard Rolling Stock Electronics
Rolling stock electronics and railway trackside monitoring units face wide battery voltage swings (12V/24V) and extreme ambient temperature shifts from -40 to +85 deg C. The ultra-wide 4:1 input (9-36VDC) and 2000VDC isolation of the BDM41 ensure compliant dielectric barriers and continuous uninterrupted operation under rail vehicle vibrations.
3. RF Wireless Communication Gateway & LoRa/DTU Transceiver Power
High-power RF transceivers, LoRa base stations, and cellular DTUs require low-ripple power rails to prevent phase noise and transmitter power degradation. The BDM41 delivers under 100mVp-p low output ripple noise and fast transient load response, providing clean supply rails for wireless power amplifiers during burst transmissions.
4. Smart Solar Inverter & Battery Energy Storage (BESS) BMS Systems
In high-voltage battery storage racks and solar combiner boxes, measuring cell voltages requires complete physical isolation between high-voltage battery packs and low-voltage MCU controllers. The 2000VDC reinforced galvanic isolation of the BDM41 module prevents high-voltage fault leakage, ensuring personnel and equipment safety.
FAQ Section
1. Why is an external input fuse mandatory for the BDM41 series?
Because switching power supply modules do not contain internal catastrophic fuses, connecting a recommended 50VDC 8A slow-blow fuse in series with the positive input line (VCC1) provides essential over-current protection against supply surges and meets safety compliance standards.
2. Can I connect the input GND1 and output GND2 together on my PCB?
No. Connecting GND1 and GND2 together completely bypasses the internal high-frequency isolation transformer, causing loss of the 2000VDC galvanic isolation barrier and exposing downstream digital electronics to input ground loop noise and voltage spikes.
3. How do I use the TRIM pin (Pin 14) to adjust output voltage?
The TRIM pin allows precise +/-5% or +/-10% fine-tuning of the output voltage to compensate for long PCB trace voltage drops. Connecting a trim resistor between TRIM and VCC2 trims the output voltage down, while connecting a trim resistor between TRIM and GND2 trims the output voltage up.
4. Does the BDM41 series require an external heat sink under full load?
Under standard ambient conditions up to +40 deg C, the module operates reliably with natural air convection cooling due to its high conversion efficiency (up to 87.5%). When operating at elevated ambient temperatures up to +85 deg C, refer to the official power derating curve in the user manual to maintain reliable operation.
