ISL6558IRZ-TK

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ISL6558IRZ-TK is a Switching DC/DC controller for a wide range of system topologies. It is designed with an adjustable frequency and adjustable voltage outputs to make it a cost-efficient and versatile product for voltage regulator circuit designs. It is most commonly used in applications such as industrial, medical, communications and automotive equipment, as well as embedded systems.

Application Field

This DC/DC switching controller is widely used to provide switched power supplies and regulation in many types of applications. For example, embedded systems applications such as industrial, automotive and medical, require a constant stable voltage source. ISL6558IRZ-TK switching controllers can be used to provide a voltage source that is accurate and controlled. In addition, ISL6558IRZ-TK is a very popular choice for communications applications since its PWM control results in high power efficiency and low EMI noise.

The ISL6558IRZ-TK also finds application in power conservation by reducing power dissipation of many circuits. As it operates at temperature up to +150℃, the device can be used in many temperature-dependent applications, such as automotive and industrial systems.

Working Principle

The ISL6558IRZ-TK controller operates on a fixed frequency PWM (Pulse Width Modulation) circuit. The controller consists of a comparator, a clock oscillator, a voltage reference and a Voltage Controlled Oscillator (VCO). The voltage reference provides a regulated reference voltage to the comparator, and the VCO adjusts the pulse width for pulse-width modulation control.

The feedback pin of the controller is connected to the output voltage, and compares the reference voltage to the output voltage. As the output voltage changes, the pulse width is adjusted accordingly, maintaining the correct output voltage. If the output voltage is too low, the pulse width is increased, and if the output voltage is too high, the pulse width is decreased.

The ISL6558IRZ-TK has two additional pins, the slope pin and the sleep pin. The slope pin adjusts the voltage transition rate across the inductor when the controller switches on and off, allowing a linear increase or decrease of the output voltage. The sleep pin turns off the controller completely, reducing power dissipation and significantly reducing EMI noise.

Finally, the ISL6558IRZ-TK includes an Over Current Protection (OCP) which monitors the peak switch current and provides a warning signal when the current exceeds a prescribed level. If the current continues to increase, the controller will shut down, reducing the possibility of damage to the system.

In summary, the ISL6558IRZ–TK is a cost–effective and versatile choice for voltage regulator applications. With its adjustable frequency and voltage, adjustable rise time and over-current protection features, the ISL6558IRZ–TK can be used in many applications, including embedded systems, industrial, automotive, and communications equipment.

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