RT2858BHGSP Integrated Circuits (ICs)

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RT2858BHGSP is a DC to DC switching regulator from Unisonic Technologies that can provide up to 1.2A load current, enabling it to realize low voltage and medium power applications. This integrated circuit presents a high performance, programmable and low power switch regulator intended for battery-operated handheld/portable applications. Additionally, it is built with an adjustable voltage output wide range, suitable for both low and medium power applications.

DC DC Switching Regulators

As its name suggests, this type of regulator is a type of voltage regulator that uses switching techniques to reduce the output voltage of a power supply. This type of regulator provides high efficiency, fast transient response and low noise as compared to linear regulators. It also offers a wide range of voltage outputs and adjustable output voltage.

The output voltage of a DC DC switching regulator is determined by the duty cycle of the switch. In order to provide a stable output voltage, the duty cycle must be adjusted depending on the output voltage and input voltage. The switching process converts the DC power supply voltage into a PWM (pulse width modulated) signal, and then the PWM signal is filtered by a low pass filter to provide a stable output voltage.

RT2858BHGSP Application Fields

RT2858BHGSP can be used in numerous applications such as battery-powered handheld/portable applications, such as PDAs, digital cameras, mobile phones and PDAs. Additionally, this regulator can also be used in low power converters, such as GSM cellular applications.

RT2858BHGSP Working Principle

The regulator is composed of an error amplifier, a voltage reference, a comparator, an oscillator, a flip-flop and a driver transistor, as well as a PWM controller IC.

The oscillator and comparator form a feedback loop of the power supply. The oscillator generates a high frequency signal and comparator compares this signal with the voltage reference output and decides whether to enable or disable the switch.

When the switch is enabled, the supply voltage is converted into a PWM signal, which is filtered by the low pass filter before it can be used by the load, ensuring a stable output voltage. The error amplifier compares the output voltage with a reference voltage, providing feedback to adjust the duty cycle.

The flip-flop circuit ensures that the output voltage does not exceed the reference voltage by keeping the switch open. The driver transistor handles the load current and the PWM controller IC provides the logic to control the switch duty cycle in order to provide the necessary output voltage.

The RT2858BHGSP provides flexibility and efficiency for handheld/portable applications and is an ideal choice for low and medium power applications.

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