EA8935

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The EA8935 from Infineon is designed to increase efficiency, reduce phase loss, and meanwhile keep power factor of power supply. It is mainly applied in the field of DC/DC or AC/DC (off-line) switch mode power supply (SMPS). This power supply module consists of one EE80C196 and one TDA-8935, as well as its built-in bootstrap driver and other necessary components.

The EE80C196 is a single-chip CMOS microcontroller with built-in RAM, ROM, and I/O, which enhances system performance and response time. The TDA-8935 is an integrated power driver module capable of driving up to 4A at 18V. It is designed to be used in a standard two-level topology, with the switching devices connected to the top and bottom side of the device to efficiently transfer energy from the input to the output.

The EA8935 is optimized for offline applications such as battery chargers and portable device power supplies. It features a wide range of primary control algorithms, secondary control algorithms, and allows for different protection circuits. It also offers integrated protection functions such as open-circuit protection, short-circuit protection, and over-voltage protection. Additionally, it has a range of programmable parameters like frequency, voltage and current limiting, enabling manufacturers to adjust power supplies to meet various customer requirements.

The working principle of the EA8935 is fairly straightforward. The EE80C196 periodically monitors the output voltage,current, and temperature from the input. When the output voltage,current, and temperature are all within acceptable levels, the EE80C196 activates the TDA-8935, which switches voltage between the low and high side of the power supply. As the output voltage, current, and temperature increases, the EE80C196 adjusts the clamping voltage applied to the high and low side of the power supply to maintain a stable output.

The EA8935 also features built-in transient protection to safeguard the power supply from current surges or electrical noise. The circuit is also designed with a low-voltage start circuit which allows it to start up even when the input voltage is below the normal operating voltage. This ensures that the power supply stays on even in a power outage.

In conclusion, the EA8935 is a great choice for designers when it comes to DC/DC and AC/DC (off-line) SMPS applications. It has a wide range of features and built-in protection circuits, making it well-suited for high power applications. It is also easy to configure and can be adapted for different customer requirements. With its high efficiency and low power losses, the EA8935 is an excellent choice for many modern power supply designs.

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