The Ebyte BAM21-15W528SxG2 series is an industrial-grade ultra-wide input AC-DC power supply module built on advanced switching flyback architecture, delivering 15W regulated output (5V/12V/24V DC) across an ultra-wide 85~528VAC / 120~746VDC input range with up to 87.59% conversion efficiency, featuring 1500VDC isolation, auto-recovery short-circuit/over-current protection, and DIP plastic encapsulated packaging for smart grid, industrial instrumentation, and IoT telemetry.
Key Features & Advantages
- Ultra-Wide AC & DC Input Range (85~528VAC / 120~746VDC): Natively accommodates global single-phase AC grids (100V/115V/220V/277VAC), two-phase lines of 380V/480VAC industrial systems, and high-voltage DC buses without needing an external step-down transformer.
- High Conversion Efficiency & Low Standby Loss: Achieves peak efficiency of up to 87.59% (12V/24V models) and 83.47% (5V model), reducing thermal dissipation and enhancing system energy efficiency in enclosed enclosures.
- Comprehensive Safety & Self-Recovery Protection: Features 1500VDC input-to-output dielectric isolation, built-in 2A/600VAC safety fuse, continuous short-circuit protection with automatic recovery, and 110%~150% over-current self-recovery.
- Rugged Industrial Design & Wide Temperature Operation: Encapsulated in a flame-retardant plastic DIP package (52.5 × 35.2 × 25.6 mm) with an operating temperature span of -40°C to +85°C and MTBF exceeding 200,000 hours (MIL-HDBK-217F).
- Output Voltage Fine-Tuning (Trim Pin): Includes a dedicated Trim pin supporting up to +10% output voltage calibration to compensate for long-distance cable voltage drops.
Core Specifications
| Parameter | Specification Details |
|---|---|
| Input Voltage Range (AC) | 85 ~ 528 VAC (47 ~ 63 Hz) |
| Input Voltage Range (DC) | 119 ~ 746 VDC (Nominal 120 ~ 750 VDC) |
| Rated Output Power | 15 Watts (Continuous) |
| Output Voltage Accuracy | ±1.0% (Typical), ±1.5% (Max) |
| Ripple & Noise | ≤ 120 mVp-p (20MHz Bandwidth, 100% Load) |
| Dielectric Strength (Isolation) | 1500 VDC (Input to Output) |
| Protection Mechanisms | Continuous Short Circuit (Auto-Recovery), Over-Current (110%~150% Io Auto-Recovery) |
| Operating Temperature | -40°C to +85°C |
| Package & Dimensions | 52.5 × 35.2 × 25.6 mm (DIP Plastic Encapsulated Through-Hole) |
| Module Weight | 70g (Module Typ.) / 200g (Packaged Gross Weight) |
Product Selection Guide
Notice for Selection: Please select the output voltage (5V, 12V, or 24V DC) and verify your required load current prior to placing an order.
| Model (SKU) | Input Voltage Range | Output Voltage | Max Output Current | Max Output Power | Conversion Efficiency |
|---|---|---|---|---|---|
| BAM21-15W528S05G2 | 85~528VAC / 120~746VDC | 5 VDC | 3000 mA (3.0 A) | 15 Watts | 83.47% |
| BAM21-15W528S12G2 | 85~528VAC / 120~746VDC | 12 VDC | 1250 mA (1.25 A) | 15 Watts | 87.57% |
| BAM21-15W528S24G2 | 85~528VAC / 120~746VDC | 24 VDC | 625 mA (0.625 A) | 15 Watts | 87.59% |
Industrial Installation & Wiring
The BAM21 series power supply is designed for standard PCB through-hole mounting. Ensure appropriate high-voltage creepage and clearance distances during PCB layout:
- Pin 1 (L): AC Live Line Input (AC_L) / High-Voltage DC Input (+).
- Pin 5 (N): AC Neutral Line Input (AC_N) / High-Voltage DC Input (-).
- Pin 14 (Trim): Output Voltage Fine-Tuning terminal (supports +10% output voltage trimming via external resistor network; leave open if unused).
- Pin 16 (Vo-): Regulated DC Output Negative terminal.
- Pin 18 (Vo+): Regulated DC Output Positive terminal.
- Pins 2/3/4/6/7/8/9/10/11/12/13/15/17: NC (No Connection / No Pin).
- Soldering Recommendations: Wave soldering at 260 ± 5°C for 5~10s; Manual soldering at 360 ± 10°C for 3~5s. External recommended fuse: 3.15A / 600VAC.
Practical Application Scenarios
1. Smart Electricity Meters & Three-Phase Power Monitoring
In power distribution cabinets and smart grid telemetry terminals, power supplies frequently face 380V/480VAC line-to-line voltages or grid voltage surges. The 528VAC ultra-wide rating enables direct power conversion without auxiliary step-down stages, powering MCUs, metering ICs, and LoRa/4G communication modules reliably.
2. Industrial Instrumentation & Automation Control Systems
Supplies stable, isolated DC power for industrial sensors, PLCs, temperature controllers, and process transmitters operating in severe industrial factory environments where voltage fluctuations and electrical noise are prevalent.
3. Smart Street Lighting & Outdoor Municipal IoT Gateways
Outdoor street lighting fixtures and municipal environmental gateways frequently experience severe grid fluctuations and transient surges. The BAM21 series provides high dielectric isolation, wide -40°C to +85°C temperature tolerance, and full self-recovery protections for 24/7 uninterrupted operation.
4. Rail Transit Telemetry & High-Voltage Energy Storage Equipment
In railway signaling, trackside telemetry, and photovoltaic energy storage battery management systems (BMS), the module operates directly from wide DC bus voltages (120~746VDC), powering local control and isolated communication nodes.
FAQ Section
1. Can the BAM21 series connect across two phases of a 380V/480VAC three-phase industrial system?
Yes. With a maximum continuous AC input rating of 528VAC, the BAM21 series safely accepts line-to-line voltages (up to 480VAC nominal + 10% tolerance = 528VAC) in three-phase Delta or Wye power systems without additional transformers.
2. How does the Trim pin adjust the output voltage?
Connecting a trimming resistor between Pin 14 (Trim) and Pin 18 (Vo+) allows you to fine-tune the DC output voltage upwards by up to +10%, compensating for IR voltage drops across long wiring harnesses.
3. What external circuit protections are recommended for harsh grid environments?
While the module includes an internal 2A/600VAC fuse and C-type input filtering, adding an external 3.15A/600VAC slow-blow fuse, a piezoresistor/varistor (e.g. 14D751K/14D821K), and a TVS diode at the output is recommended for high-surge industrial installations.
4. Can the module operate from high-voltage DC bus inputs?
Yes. The BAM21 series is fully compatible with DC inputs from 119VDC to 746VDC (nominal 120V~750VDC), making it ideal for renewable energy, solar inverters, and high-voltage DC bus systems.
