ISL6247CR

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ISL6247CR, developed by Intersil, is a DC-DC switching controller ideally suited for power conversion, regulation and system control applications. This chip’s unique onboard, adaptive loop system provides many advantages such as highly efficient operation over a wide range of load levels, wide input voltage range and current mode control. ISL6247CR combines an onboard high/low side driver, a low voltage reset circuit, and many other features such as its adaptive loop adaptive loop circuit that can adapt to changing load conditions to enhance system stability and dynamic response.

The primary applications of ISL6247CR are isolated or non-isolated DC-DC converters, such as buck, flyback, forward, SEPIC, dual dynamic converters and other step-down, step-up, and combined step-up/step-down topologies. It can also be used for various type of PWM controllers for pulse width modulated (PWM) or phase-shifted full bridge controller applications. This chip’s low dropout voltage makes it well suited for high load efficiency applications.

The working principle of the ISL6247CR switching controller is based on current mode control. In this type of control, the output current is used as a feedback signal and the inductor current is sensed by an internal current sensing circuit. This inductor current sensing is then compared to the signal from an internal or external error amplifier, based on which a switching device is turned on or off, changing the output voltage. As the output current decreases and inductor current increases, the signal gain of the error amplifier increases and the switching frequency also increases, keeping the output voltage at the desired level.

The ISL6247CR’s main advantages are that it features a wide input voltage range for enhanced flexibility and optimized power efficiency, an adaptive loop system for enhanced system stability and fast transient response, an optional noise bypass capacitor for better noise and EMI performance, and a slew rate feedback loop for low output noise. This chip also features an adjustable, internally regulated soft-start circuitry to limit any inrush current, a low voltage reset (LVR) circuit to protect the system from overvoltage, overcurrent, overtemperature, and undervoltage conditions, and an adjustable current limit for tailored operation.

In summary, the ISL6247CR is a high performance, low drop-out, current mode DC-DC switching controller. It is ideally suited for applications needing wide input voltage range, high load efficiency, and fast response time. The device’s current-mode control, low voltage reset circuit, adjustable output soft-start circuit, adjustable current limit, noise bypass capacitor, and other features make it a great choice for power conversion, regulation, and system control applications.

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