ISL6569ACR-T

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ISL6569ACR-T is a pulse-width modulated (PWM) controller and it is mainly used in DC to DC power converters. It includes many features such as programmable over-voltage (OVP) protection, over-temperature protection, under-voltage (UVP) protection, and an internal power-on timer. It is mainly used in the application field of DC-DC converters and power inputs for tough applications, especially for servers, telecommunications, automotive, industrial systems, and healthcare systems.

The working principle of the ISL6569ACR-T is based on the controlling of power delivered through a power switch device which is driven by one or more pulse width modulated signals. It consists of an asymmetrical dual-phase architecture, which is used to generate two low-skew output PWM signals of the same frequency, but with a phase difference of 180 degrees. In such a topology, power transistors are connected in series in each phase and they are driven with complimentary duty cycles that forces a sum of 0 duty cycle, meaning no power is delivered by the converter when the switches are off. A feedback signal is used to ensure that the output voltage stays constant by adjusting the duty cycle of each switch.

The ISL6569ACR-T PWM controllers offer features such as:

• Current-mode control for improved stability
• Programmable switching frequency up to 400KHz
• Programmable over-voltage, under-voltage and over-temperature protections
• Integrated power-on timer

The integrated multi-bit, digitally-controlled oscillator (DCOTM) allows dynamic adjustment of frequency from the external control signal. The internal logic of the IC checks if the output voltage stays within the desired range so that only a fixed frequency is used for all load conditions. The ISL6569ACR-T is designed with a peak current-mode control with programmable slope compensation, so that dynamic and fast line/load transients can be sensed and controlled.

The current limit value is determined by an external resistor that sets the current limit level, while the over-temperature protection shuts down the controller if the die temperature exceeds the maximum temperature threshold. The device also includes a programmable internal power-on timer delay to allow time for the output to reach regulation before attempting to regulate the output to the desired value, thus avoiding power disruptions or difficult start-up conditions.

The ISL6569ACR-T operates over a wide input range of 8 to 24 volts, making it ideal for many tough applications. It also offers high efficiency levels and superior output noise performance, as it can operate at higher frequencies than comparable PWM controllers, allowing smaller size and lower cost components to be used. This helps in reducing the overall footprint of the power supply.

In conclusion, the ISL6569ACR-T is a highly versatile and reliable DC-DC switching controller ideal for many power supply applications. It offers excellent performance, reliability and high efficiency, making it an ideal choice for high-power and difficult AC-in/DC-out applications.

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