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.
How do PWM controllers work?
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.
What are PWM controllers used for?
PWM controllers are common in many applications including variable speed fans, house dimmer switches and electric cookers.
Description:
The isolated-flyback power supply controller provides Constant-Voltage (CV)
and Constant-Current (CC) output regulation to improve transient response to large load steps. Primary-Side Regulation (PSR) eliminates the need for an Optocoupler. Current-Mode and Voltage-Mode PWM ControllerPrimary-Side RegulationPeak ...
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Texas Instruments integrated controllers for Power Factor Correction
(PFC) in pre-regulators and PFC converters can achieve near unity power factor and give stable, low distortion sinusoidal line currents. They utilise advanced features and innovative processes such as quantized voltage feed-forward, ...
Description:
The Microchip MCP1632 is a Pulse-Width Modulator (PWM)
Controller developed for standalone Switched-Mode Power Supply (SMPS) applications. Integrated into the device are a high-speed Analogue Control Loop, a logic-level MOSFET Driver, an Internal Oscillator, a Reference Voltage Generator, and Internal ...
Description:
Texas Instruments offers digitally enabled, configurable and fully
programmable power controllers, providing customers with flexibility, efficiency and integration to meet dynamic system needs.
