ROL-1215S

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DC-DC converters are widely used in many different industrial applications due to their ability to efficiently convert DC power from one voltage level to another. The ROL-1215S from STMicroelectronics is a monolithic step-down DC-DC converter designed for Internet of Things (IoT) applications. It offers a wide output voltage range and high efficiency for up to 4V or 8V input supply levels. This article looks at the application field and working principle of ROL-1215S.

The ROL-1215S is a buck DC-DC converter with up to 4V or 8V input and 3V to 9V output. It delivers a maximum current of 1.5A and is available in a small 9-pin USPQ-1 package, making it ideal for space-constrained IoT designs. The device is optimized to provide high efficiency and low output voltage ripple, making it suitable for powering wireless sensors that require continuous supply. It also offers configurable soft-start and an enable and disable option for additional control.

The ROL-1215S uses a Pulse Width Modulation (PWM) voltage-mode control topology. At the heart of the PWM control is the error amplifier which compares the output voltage and feedback voltage. The error amplifier will then generate an output signal to the active switches, which adjusts the duty cycle of the converter as necessary. The adjustment is made at a frequency determined by the external resistor-capacitor (RC) network.

Once the duty cycle is adjusted, the power stage takes over. The power stage consisits of an inductor, two power MOSFETs, and two diodes. The two MOSFETs are used to either allow or prevent current through the inductor in order to change the output voltage. When the switch is in the open position, the diodes will prevent the inductor from discharging. This process is repeated to maintain the output voltage, hence the term "pulse width modulation."

The other notable feature of the ROL-1215S is its wide operating voltage range. It has a maximum 4V or 8V input voltage and a corresponding 3V up to 9V output voltage. This makes the device versatile and can be used in numerous IoT applications such as wearables, consumer electronics, automotive, and industrial automation. The ROL-1215S can also operate over a wide temperature range, making it ideal for powering a wide range of devices.

Overall, the ROL-1215S from STMicroelectronics is an ideal choice for IoT and embedded applications. The PWM based control with adjustable frequency and wide network of external components allows for an accuracy and efficiency. The wide range of input voltage and operating temperature make it suitable for a variety of applications. The enable and disable feature also provides additional control and flexibility for the designer.

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