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Simple Light Load Control Meets the New Energy Efficiency Standards

Mon, 08/17/2009 - 7:36am
Kevin Turchin, FAE Manager, ROHM Semiconductor USA

EZ header Microchip 

Energy efficiency standards have typically concentrated on two ends of the spectrum – full load efficiency and standby power. As a result, popular PWM buck regulators available today demonstrate high efficiency at full load (>80%) levels and incorporate standby circuitry to comply with the <1W and lower initiatives. Improved efficiency at all operating points is an important concern in the design of next generation “green” products. The 80 PLUS Program, for example, requires products to achieve 80% or better efficiency at 100%, 50% and 20% loading.

To optimize the overall efficiency, designers need to specifically address the requirements at light loads. In addi¬tion, the control strategy applied at light loads must be designed to seamlessly transfer to and from traditional PWM control as the load level changes. At ROHM Semiconductor, we’ve developed just such a control technology given the name: Simple Light Load Mode™ (SLLM) Control.

Principals of SLLM - Advanced Control for Light Loads
To improve the efficiency of products in the previ¬ously ignored low-power operating regime, ROHM Semiconductor has adapted the technique commonly know as “pulse skipping” as the basis for an implementation called Simple Light Load Mode Control.

Consider Efficiency under All Operating Conditions
SLLM technology with synchronous rectifier design and other circuitry techniques provides excep¬tional load regulation and high efficiency at both low and high power operating modes. Switching regulators incorporating this approach address the emerging needs for “green” product designs. With SLLM technology, system designers can provide longer, problem-free operation of portable devices as well as reduced energy consump¬tion under all operating conditions. ROHM Semiconductor’s new BD91x Series of Switching Regulators utilizes SLLM to provide high efficiency over a wide range of load conditions. For more information, please go to www.rohmsemiconductor.com/SLLM

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