SUTS34812

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DC-DC converters are devices that convert power from one DC voltage to another. The SUTS34812 is a highly efficient, voltage-mode controlled, step-down DC-DC converter which can be used to reduce a higher input voltage to a lower, regulated voltage output. It can deliver up to 3 A of regulated output current over a wide input voltage range of 4.5 V to 28 V. This makes the device suitable for a variety of applications, including those powered by lead-acid batteries, mobile phone charging and automotive electronics.

Features and Specifications of the SUTS34812

The SUTS34812 features an adjustable output voltage range of 0.8 V to 20 V, a 1 MHz switching frequency and a current limit of 4 A. It also includes a thermal shutdown protection feature which protects the device from overtemperature and current overload. The device has a peak efficiency up to 95%, making it an ideal choice for applications requiring high efficiency over a wide operating temperature range. The device requires no external Schottky diode and is available in an SOT-223 package, which is suitable for applications with space constraints. Additionally, the device features an adjustable Soft-start and includes an enable pin for system power control.

Working Principles of the SUTS34812

The SUTS34812 utilizes a switching-mode power conversion technique to convert the input voltage to a regulated voltage output. The device uses a voltage-mode control technique to regulate the output voltage, with the error amplified with an operational amplifier (OpAmp). The amplifier effectively monitors the output voltage by comparing it to a reference voltage derived from the external resistor divider network. A high-side external MOSFET switch is used to transfer power from the input to the output.

The regulator cycle begins by the OpAmp, when the output voltage is less than the reference voltage, it sends an error signal output to the Pulse Width Modulation (PWM) controller. The PWM controller then turns the external switch on and off at a 1MHz frequency, with the duty cycle of the switching waveform adjusted automatically to regulate the output voltage. This process enables the SUTS34812 to accurately regulate and maintain the output voltage despite changes in the input voltage, output current or load.

Applications of the SUTS34812

The SUTS34812 is suitable for a range of applications due to its wide input voltage range and adjustable output voltage. It can be used to provide a regulated power output for automotive applications including vehicle entertainment systems, dash cams, rearview mirror monitors, and other 12 V automotive electronics. It can also be used in industrial applications such as automation systems, computers, and robotics. Additionally, it can be used in medical and consumer applications powered by lead-acid batteries such as medical monitors and portable consumer electronics.

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