CSS50057/TI

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AC DC Converters

The CSS50057/TI is part of Texas Instruments’ family of integrated circuits, and it is specifically designed as an AC/DC converter for advanced switched-mode power supplies. The circuit is typically used as a flyback controller contained in off-line power supplies, LED lighting applications, motor drives, and any other medium power application. This versatile device is designed to meet a wide range of applications for maximum flexibility in design.

The CSS50057/TI has several features that make it stand out among other AC/DC converters on the market. It includes a quiescent current exceeding 0.4 mA, and it is designed for maximum flexibility. The device is offered in two versions, a PIP-compatible version, and a GREEN-mode version, both with adjustable switching frequency, and allows the flexibility to choose between both no-load and light load performance profiles.

The CSS50057/TI microcontroller works by comparing the output voltage, ambient temperature, delay time and inductor current with the voltage feedback comparator. When these signals are compared, the microcontroller calculates the necessary duty cycle and then it sends the signal to the high-side driver, which, in turn, sends the signal to the switching device. This process helps maintain the required output voltage and, through the feedback loop, the controller also creates a constant current flow in the circuit, which is typically used in off-line power supplies, LED lighting applications and motor drives.

The CSS50057/TI is also designed to be extremely efficient. The efficiency of this device is suitable for advanced power conversion and performances in terms of power savings, which are achieved thanks to lower EMI emissions and optimized thermal design. The total power losses and the thermal design are reduced with a patented current-mode control loop architecture. This architecture helps control the switching losses and improve the current limitation with a fast response and wide bandwidth.

The CSS50057/TI is a highly-efficient AC/DC converter with very low power losses and several features that make it suitable for wide range of applications. Thanks to its microcontroller, the device can precisely control the duty cycle to maintain an accurate output voltage level and consequently, create a constant current flow in the circuit. The patented current-mode control loop architecture also helps to reduce power loss and improve the overall efficiency of the device.

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