Overview

This document provides a comprehensive technical overview of Tamura Corporation's power supply modules, focusing on switching power supply technology and modular power supply products. It includes product specifications, features, application guidelines, and safety considerations.

1. Introduction to Power Supply Modules

Power supply modules integrate key components such as transformers, control ICs, switching elements (FETs), and control circuits into a single package. These modules simplify the design of switching power supplies by reducing the number of external components and development effort.

Key Benefits

• Reduction of standby power consumption
• Noise reduction
• Ease of parts procurement
• Compact size
• Simplified circuit design

2. Switching Power Supply Technology

The modules use switching technology, which converts AC mains (100-240V AC) to DC by rapidly switching semiconductor devices (~100,000 times per second). This method offers high efficiency and compactness, widely used in devices like smartphones and laptops.

The power supply module encapsulates the voltage conversion section (transformer, semiconductor switch, control circuit) into one unit, significantly reducing design and evaluation workload by approximately 80%, including transformer design, thermal design, safety compliance, and electromagnetic compatibility (EMS) testing.

3. Features of Tamura Power Supply Modules

• High efficiency and ultra-low standby power enabled by proprietary circuit technology derived from laptop AC adapter development.
• Maintains high efficiency across all load ranges, from no load to full load.
• Compact footprint, approximately half the area compared to discrete component designs.
• Supports worldwide input voltage ranges and power factor correction (PFC) output voltages.
• Enhanced insulation between primary and secondary circuits.
• Low noise operation due to Tamura's unique structural design.
• Built-in protection functions: overcurrent protection (auto-recovery), overvoltage protection (latch stop), and overheat protection (latch stop).
• Compliance with various safety standards for information, AV, industrial, and household equipment.

4. Product Series and Specifications

The document details five main series of power supply modules, each targeting different power classes and applications:

• SPM Series: 4W class, output voltages 3.3V to 12V, input voltage DC110-374V, typical efficiency 70-82%, standby power ~50mW.
• EPM Series: 15W class, output voltages 3.3V to 24V, input voltage DC110-450V, typical efficiency 78-90%, standby power 15-28mW.
• MPM Series: 25W class, output voltages 5V to 48V, input voltage DC100-420V, typical efficiency 82-90%, standby power 25-45mW.
• BPM Series: 40W class, output voltages 5V to 24V, input voltage DC100-420V, typical efficiency 87-93%, standby power ~25mW.
• RPM Series: 80W class, output voltages 12V to 48V, input voltage DC100-420V, typical efficiency 90-94%, standby power 50-120mW.

Each series includes detailed parameters such as output voltage/current, voltage variation, ripple voltage/noise, insulation voltage and resistance, environmental operating conditions (temperature, humidity, vibration, shock), and protection features.

5. Mechanical Dimensions and Pin Assignments

For each series, the document provides precise mechanical dimensions with ±0.5mm tolerance and detailed pin assignments for primary and secondary sides, including input terminals, noise adjustment, control winding, output voltage sensing, and ground connections.

6. Application Notes and Precautions

• Contents are subject to change without notice due to improvements.
• Provided circuit examples and component values are for reference; users must verify and validate designs independently.
• Users must ensure safety design to prevent accidents or damage due to possible product failures.
• Modules are intended for general electronic equipment; use in high-reliability or safety-critical applications (medical, transportation, aerospace, nuclear, automotive, etc.) requires prior consultation with Tamura.
• Not designed for use in harsh environments such as exposure to liquids, corrosive gases, strong electromagnetic fields, direct sunlight, or condensation.
• Modules are not radiation-hardened and do not support series or parallel output connections or N+1 redundancy.
• Use and export of products and technical information must comply with applicable domestic and international laws and regulations.
• Environmental compliance (e.g., RoHS) must be confirmed with Tamura sales representatives; users are responsible for regulatory compliance.
• Unauthorized reproduction or copying of document content is prohibited.

7. Contact Information

The document lists Tamura Corporation's headquarters and global offices in Japan, China, Taiwan, Korea, Thailand, Malaysia, USA, and the UK, including addresses, telephone, and fax numbers.

Summary

Tamura's power supply modules offer compact, efficient, and low-standby power solutions for a wide range of electronic applications. Their modular design reduces development time and cost while ensuring compliance with safety and environmental standards. Detailed product specifications and mechanical data support easy integration, with clear guidelines on usage and limitations to ensure safe and reliable operation.