STEVAL-ISA113V1

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The STEVAL-ISA113V1 is an evaluation board from STMicroelectronics specially designed to measure the performance of primary side regulated off-line SMPS, using the STICE2 chipset. The board is suitable for a wide range of applications, including commercial and industrial lighting, electronic appliances, PC power supplies, battery chargers, and consumer applications.

The STEVAL-ISA113V1 is based on the STICE2 primary side regulation architecture. In this architecture, the STICE2 regulates the output voltage of an ordinary off-line supply without the need for a secondary controller. It uses a closed loop feedback circuit to monitor the output voltage and adjust the PWM signal accordingly, enabling the SMPS to respond quickly and accurately.

The primary side regulation circuit of the STEVAL-ISA113V1 is connected to the secondary side control circuitry via an opto-coupler. The primary side circuit consists of a PWM controller, a comparator, and an error amplifier. The PWM controller generates the basic switching frequency, which can be adjusted via a potentiometer. The comparator monitors the output voltage, and the error amplifier compares the error voltage with the reference voltage to generate the PWM signal.

The secondary side control circuitry consists of a linear controller, an MOSFET, a rectifier, and a power transformer. The linear controller regulates the drain-source voltage of the MOSFET, while the rectifier provides the output voltage. The power transformer is designed to match the load power requirements.

The STEVAL-ISA113V1 also supports various protection features, including overload protection, over-temperature protection, and short-circuit protection. The board is designed to be easy to use. The control parameters can be adjusted via the USB connection, which can be used to monitor and adjust the operating parameters of the circuit, such as output voltage, output current, power factor, etc.

The STEVAL-ISA113V1 is a powerful and versatile evaluation board from STMicroelectronics. It is an ideal tool for testing and evaluating the performance of off-line SMPS designs.

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