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<p>Electronic circuits can contain both analogue and digital components. PWM, which stands for Pulse Width Modulation, facilitates the control of analogue devices using a digital signal. Many electrical designs use PWM for regulation, with PWM used as a way to reduce the average power that is delivered by an electrical signal by chopping it up into smaller parts. RS offer a range of PWM Controllers from a multitude of trusted brands, including ON Semiconductor, STMicroelectronics, Texas Instruments, and more.</p><h2><h2>What do PWMs do?</h2><p></h2>Analogue signals can be on or off, or can even be put into a position half-way between the two, whereas a digital signal has just on or off positions. Both signals appear in electronic circuits and can often be required to work together. Inputs can be converted using a DAC (digital-to-analogue converter) or an ADC (analogue-to-digital converter). PWM is available to control the output of a device: for example, PWM can convert the digital output of a microcontroller (MCU) into an analogue signal to drive the next analogue component.</p><h2><h2>Types of PWM devices:</h2><ul><li></h2>PWM Voltage Mode Controllers work by applying a control voltage (Vc) and a PWM ramp (Vramp) input.</li><li>PWM Current Mode Controllers add a second loop feeding back to the inductor current to create the PWM ramp.</li><li>PWM Switching Regulators feed the input voltage back through the PWM controller to keep the output voltage constant.</li></ul><h2><h2>What is a duty cycle?</h2><p></h2>PWM signals feature two main things: frequency and a duty cycle. Duty cycle is given as a percentage (%) and refers to the amount of time the signal is on. For example, if the duty cycle is 50%, the signal is on for 50% and off for 50% of the time period. Pulse width modulation uses a rectangular pulse wave.</p><h2><h2>Where are PWM controllers used?</h2><ul><li></h2>Motors</li><li>LED lighting</li><li>Lamps</li><li>Heaters/HVAC</li><li>Electric vehicles</li><li>Robotics</li><li>Communication systems</li></ul>

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<p>Pulse width modulation (PWM) is a modulation technique that is used to encode a message into a pulsing signal. PWM controllers encode data onto the duty cycle (the ratio or percentage of one period in which a signal or system is active). The encoded data is commonly used in power electronic systems to regulate the amount of power applied to the load.</p><h2>How do PWM controllers work?</h2><p>A PMC will use voltage feedback to ensure that the voltage applied to a load is precisely controlled. The controller will supervise the switching operation to regulate the output voltage by comparing output voltage with the desired output to derive the correct voltage. They are popular because of their high efficiency over a wide voltage input range.A PWM controller can also be integrated with a hot swap controller for enhanced power monitoring accuracy.</p><h2>What are PWM controllers used for?</h2><p>PWM controllers are common in many applications including variable speed fans, house dimmer switches and electric cookers.</p>

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