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The Industry’s First High Efficiency AC/DC Converter IC with Integrated PFC Control Function: Enables Energy Star 6.0 compliant 100W-class products

ROHM has recently announced the availability of a high-efficiency AC/DC converter that integrates PFC (Power Factor Correction) and a QR (Quasi-Resonant) converter into a single package, making it ideal for 100W-class equipment such as TVs and industrial power supplies.

The BM1C001F is the first in the industry to incorporate an internal PFC ON/OFF control function and optimized PFC control method within the PFC controller. This improves efficiency during light loads and significantly reduces standby power. Power supplies utilizing this IC will be compliant with Energy Star 6.0, the latest international energy standard. In addition, the 2-controllers-in-one design reduces the number of external parts, contributing to power supply miniaturization.

In recent years, mounting energy shortages have required greater efficiency improvements in electronic devices of all types. PFC is required to reduce the harmful effects of harmonics that become significant at loads over 75W. However, PFC tends to have a negative effect on efficiency. LCD TV manufacturers are progressing to 100W-class supplies to reduce skews and reduce the design and evaluation burdens for each model. Combining an AC/DC converter with built-in QR controller with a separate PFC circuit can present problems regarding board space, power supply size and being able to meet Energy Star 6.0 requirements.

In response, ROHM has been the first to integrate a special ON/OFF control of the PFC controller in a QR AC/DC converter IC. This improves conversion efficiency during light loads while reducing standby power consumption. In addition, a new proprietary PFC control method is included in the PFC controller that optimizes efficiency based on AC input voltage. Integrating this IC in a 100W class power supply will result in 89% efficiency at 100VAC and 89.5% efficiency at 230VAC, exceeding the latest Energy Star 6.0 requirements that stipulate at least 88% efficiency.
Also, layout optimization makes it possible to integrate the PFC and QR controllers in to a single package, reducing parts count by 20% compared to conventional solutions.


Pricing: 100 yen (Samples)
Availability: Now (OEM Quantities)


Key Features
1．The industry’s first PFC controller ON/OFF setting function improves conversion efficiency at light loads and reduces standby power consumption
・Monitors load on the secondary side and switches the PFC controller OFF at lighter loads, improving power supply conversion efficiency.
・Adopting this IC in 100W class power supplies results in a standby power of less than 85mW at 100VAC and 190mW at 230VAC, exceeding the latest Energy Star standard (6.0) requirements that mandate 210mW or less.

2．New proprietary PFC output control method ensures high efficiency worldwide
Input AC voltages vary depending on country/region, but conventional PFC ICs provide a constant output voltage, resulting in higher switching losses.
ROHM’s new PFC control method delivers an output voltage optimized for the input AC voltage. This improves conversion efficiency in 100W-class power supplies by 1-2% compared to fixed PFC output solutions in 100VAC systems.

3．QR and PFC controllers are integrated into a single package, reducing the number of external parts significantly
The single-package design with internal PFC and QR controllers eliminates a number of components, reducing parts count by 20% compared to solutions utilizing an external PFC circuit.


Terminology
・PFC (Power Factor Correction) Controller
A type of controller that reduces harmonic current by ensuring a power factor (of the power supply) close to 1. Incorporating this in devices 75W or greater is mandatory in Europe, while in Japan almost all products are already equipped with this controller.

・QR (Quasi-Resonant) Controller
Provides higher conversion efficiency in medium power applications compared with PWM types.

・Harmonics
A voltage or current that includes an integral multiple of the fundamental frequency. Harmonics reduce the quality of AC supply and cause increased heating in other devices.

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