R2A11302FT#V9

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Introduction

The R2A11302FT#V9 is a high efficiency, high current pulsed width modulation (PWM) Power Factor Correction (PFC) controller developed by ROHM Semiconductor in 2019. It features a supply voltage of 10V to 24V, a total power range of 3 to 5W, a 90- to 180-degree phase shift, a 3.75A peak load current, and a temperature range of -40°C to +85°C.

Application Field

The R2A11302FT#V9 is ideally suited for use in a wide range of PFC applications, including AC/DC power supplies, standby power, portable power, white goods, office automation products, telecom and automotive applications. It can also be used in a variety of lighting applications including LED bulbs, LED tubes, street lamps and interior lighting.

The R2A11302FT#V9 is ideal for applications requiring high PFC performance, with a guaranteed efficiency of up to 95% and power factor of up to 0.95. It features a wide operation range and low EMI noise with integrated EMI filters, current sensing and protection circuitry, as well as flexibility in dimming sequences.

Working Principle

The R2A11302FT#V9 works by applying an active power factor correction (PFC) technique known as ‘power factor control’. This uses an algorithm to control the voltage, current, and phase relationship between the input line and output line of an AC/DC converter. When power is applied to the converter, the controller compares the instantaneous line-voltage and line-current signals and adjusts the conduction angle of the MOSFET accordingly in order to maintain a near-unity power factor.

This system is known as discontinuous current mode (DCM) control, which allows for high efficiency and power factor with very low EMI emissions. Additionally, the system is capable of operating from wide input voltage and includes a soft-start circuitry and under-voltage protection. This helps to ensure that the application operates safely and efficiently.

Conclusion

The R2A11302FT#V9 is a high efficient and high current PFC controller designed to meet the needs of a wide range of applications. It features good EMI performance, high power factor, and a wide operation range, making it ideally suited for AC/DC power supplies, lighting, standby power, and automotive applications. This controller uses the discontinuous current mode control algorithm, which allows for high efficiency and low EMI emissions. It also includes soft-start circuitry and under-voltage protection, ensuring safety and efficiency.

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