ISL85413DEMO3Z

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The ISL85413DEMO3Z is a single-stage flybuck evaluation board designed to evaluate the operation and performance of the ISL85413 four-channel, high-efficiency, “green” synchronous PWM controller. The controller, which has an input voltage range of up to 2V to 8V and a 2V-to-10V output voltage range, drives four external N-channel MOSFETs in a three-phase bridge buck PFC configuration. This evaluation board is designed to provide designers with a simple testing platform that is optimized to increase design flexibility, robustness and debugging capability. It also enables designers to quickly evaluate and debug the associated application.

The ISL85413DEMO3Z supports a variety of input/output combinations, such as ac DC (off-line) SMPS, switch-mode power supplies, and motor control over a wide range of switching frequencies. Its synchronous operation is ideal for many power conversion applications, such as DC/DC, multiphase conversion and motor control.

The ISL85413DEMO3Z evaluation board features a simple user interface, with visual LEDs, potentiometers, and I2C control for quickly adjusting and monitoring the system parameters. Furthermore, the board includes on-board power and protections circuits, such as soft-start, over-temperature protection, current protection, short-circuit protection, and load dump protection that ensure reliable operation.

The working principle of the ISL85413DEMO3Z is based on the phase-shifted full-bridge, synchronous buck PFC topology. In this topology, the active bridge converter is provided with an input voltage (Vin) from the AC line. The input voltage is rectified by the bridge rectifier and, at the same time, filtered by the EMI filter. The controller feeds the converter with a variable pulse width modulation (PWM) signal, generating a continuous sinusoidal output current. From this current, the controller derives a pulse-width modulated (PWM) gate signal, which drives the N-channel MOSFETs operating in synchronous rectification with a low switching frequency.

The output voltage is regulated to a constant value, thanks to a regulation loop which compares the sensed output voltage with a reference voltage. To increase the efficiency of the converter, the MOSFETs are driven with four complementary outputs, reducing the switching losses, while the active bridge geometry enhances the effective duty cycle and further optimizes the overall system performance.

In addition to the operating functions, the ISL85413DEMO3Z evaluation board also provides protection features such as Over-Temperature protection (OTP), over-current protection (OCP) and short-circuit protection (SCP). These protections limit the current to the device, reduce power losses in the system, and help the system maintain optimal performance.

In conclusion, the ISL85413DEMO3Z is a highly efficient evaluation board designed for evaluation of the ISL85413 four-channel synchronous PWM controller. It supports a wide input/output range and is suitable for ac DC (off-line) SMPS, switch-mode power supplies and motor control applications.

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