Work | A20112 Power Supply Schematic

The (specifically the R2A20112 ) is a high-performance Integrated Circuit (IC) developed by Renesas Electronics, designed as a Power Factor Correction (PFC) controller . It is commonly used in switching power supplies (SMPS) for high-power applications such as plasma TVs, large LED displays, and industrial power modules.

The true value of the R2A20112A is illustrated in its typical system diagram. Figure 1 from the Renesas application note outlines the major components:

Core Architectures: Switched-Mode (R2A20112) vs. Linear (12-0-12) 1. The R2A20112 SMPS & PFC Topology a20112 power supply schematic

Powering equipment that requires low noise and high efficiency.

Understanding these schematics is essential for engineers, hobbyists, and repair technicians looking to troubleshoot, design, or modify stable power-delivery systems. This comprehensive breakdown covers both architectures, exploring their circuit stages, critical component selections, and key diagnostic workflows. The (specifically the R2A20112 ) is a high-performance

The is a textbook example of a flyback converter with primary-side PWM control and secondary-side TL431 regulation. Whether you are repairing a dead monitor or designing a custom 12V power source, understanding this schematic gives you a massive advantage.

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In simple terms, a PFC circuit makes an electronic device "look" like a simple resistor to the mains power grid. Without it, the current drawn from the wall outlet can be out of phase with the voltage, creating "harmonics" that waste energy and interfere with other equipment on the same circuit. The R2A20112 is designed to correct this, ensuring high efficiency and compliance with international power quality standards.

A standard switching power supply like this typically follows a four-stage conversion process Input Protection & Rectification

Repair safely – always discharge the bulk capacitor (310V DC) with a 10kΩ resistor before probing.