Cherokee International LLC (Tustin, CA), a manufacturer of switch-mode power supplies, announced an ultra-high-efficiency C-BUS converter in a quarter-brick package. The integrated power solution addresses the trend for high-performance power conversion driven by new chip set technology for telecom and networking applications. The C-BUS CBQ2548G1 converter provides 25A in a 12V nominal output at an efficiency of 96%. The C-BUS is suitable for applications that require high currents at low voltages provided by the non-isolated point-of-load (POL) converters.
The bus converter supports the emerging two-stage, dc power conversion architecture aimed at the 48V systems that provide power to multiple, non-isolated, POL converters downstream. Cherokee's latest C-BUS converter provides a quasi, or loosely regulated, 12Vdc isolated intermediate bus. The intermediate bus voltage powers the myriad of non-isolated, POL converters, while the increased efficiency minimizes the losses when using a two-stage, 12V driven architecture.
With a narrow input of 42Vdc to 53Vdc and a high power density of 210W/in³, the converter is a smart dc transformer that runs open loop to maximize efficiency and output current yet minimizes the component count. The C-BUS converters meet the basic insulation requirements of EN60950, and come complete with vital industry-standard features such as remote on/off, over-temperature protection, output over-current and over-voltage protection, and input under-voltage protection. Other features include 1,500Vdc input-to-output isolation, no minimum load requirements, constant frequency operation for predictable EMI characteristics, low ripple and noise, and auto restart after fault shutdown. The C-BUS converter comes in both open-frame and base plate versions.
The C-BUS is available in both positive and negative logic modules, and is priced at $49 for quantities of 1,000 units. Samples are available directly through Cherokee International.
