SP4446EB

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The SP4446EB is an evaluation board designed for DC/DC and AC/DC (off-line) SMPS. It utilizes a Texas Instruments switching controller IC to ensure efficient, reliable and low-noise operation.

The SP4446EB has two DC/DC channels that can deliver up to 10A and 12V as well as two AC/DC channels that can deliver up to 10A and 24V. It includes built-in protection circuitry including over-temperature protection, over-current protection, and short-circuit protection. The board also features an on-board 5A current-mode synchronous buck regulator for post-regulator applications.

The key feature of the SP4446EB is its ability to program the switching frequency through a single header connection. This allows designers to optimize the efficiency of their design and pick a frequency which offers the most complete protection against EMI. The board also features a start-up resistor to protect the switching controller against inrush current.

In terms of working principle, the SP4446EB utilizes a hysteretic mode based control for single switch, two-switch, or multiple-switch converters. Hysteretic control is a simple yet efficient control loop which uses a fixed hysteresis window to regulate the output voltage. This makes it easy for designers to design digital control loops and quickly adjust loop response for different load conditions.

Hysteretic control is based on the concept of predicting load current and output voltage. It measures input and output voltages and calculates the difference in voltage in order to determine whether the duty cycle should be increased or decreased. The duty cycle is then adjusted to maintain the output voltage within a defined hysteresis window. This provides fast and accurate control of switching converters without the need for complex analog circuits.

The SP4446EB contains all the necessary components and control circuits to evaluate DC/DC and AC/DC (off-line) SMPS. It serves as a great platform for testing and debugging power converters. With its hysteretic control, it provides accurate control and fast response which can help designers to quickly develop, optimize, and troubleshoot their power conversion designs.

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