PWM

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 Components offer a range of PWM Controllers from a multitude of trusted brands, including ON Semiconductor, STMicroelectronics, Texas Instruments, and more.

What do PWMs do?

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.

Types of PWM devices:

  • PWM Voltage Mode Controllers work by applying a control voltage (Vc) and a PWM ramp (Vramp) input.
  • PWM Current Mode Controllers add a second loop feeding back to the inductor current to create the PWM ramp.
  • PWM Switching Regulators feed the input voltage back through the PWM controller to keep the output voltage constant.

What is a duty cycle?

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.

Where are PWM controllers used?

  • Motors
  • LED lighting
  • Lamps
  • Heaters/HVAC
  • Electric vehicles
  • Robotics
  • Communication systems

...
Read more Read less

Filters

Viewing 1 - 7 of 7 products
Results per page
Description Price Maximum Switching Frequency Start-up Supply Current Maximum Source Current Maximum Sink Current Maximum Supply Current Output Voltage Output Current Zero Power Detection Control Method Number of Outputs Fall Time Mounting Type Package Type Rise Time
RS Stock No. 778-0902
Mfr. Part No.XRP7665IDBTR-F
BrandMaxLinear
TWD34.30
Each (In a Pack of 10)
units
400 kHz - - - - 0.925 → 16 V 3 A - - 1 - Surface Mount SOIC -
RS Stock No. 913-4357
Mfr. Part No.XRP7665IDBTR-F
BrandMaxLinear
TWD18.10
Each (On a Reel of 2500)
units
400 kHz - - - - 0.925 to 16 V 3 A - - 1 - Surface Mount SOIC -
RS Stock No. 170-4519
Mfr. Part No.XRP6124HVES0.5-F
BrandMaxLinear
TWD28.10
Each (In a Bag of 200)
units
1000 kHz - - - - 1.2 to 12 V 4 A - Voltage 1 35ns Surface Mount SOT-23 45ns
RS Stock No. 769-5649
Mfr. Part No.XRP6124HVES0.5-F
BrandMaxLinear
TWD31.40
Each (In a Pack of 5)
units
1000 kHz - - - - 1.2 → 12 V 4 A - Voltage 1 35ns Surface Mount SOT-23 45ns
RS Stock No. 733-6416
Mfr. Part No.XRP7664IDTR-F
BrandMaxLinear
TWD42.40
Each (On a Tape of 5)
units
340 kHz - - - - 16 V 2 A - - 1 - Surface Mount SOIC -
RS Stock No. 686-5755
Mfr. Part No.SP6137EU-L/TR
BrandMaxLinear
TWD46.80
Each (In a Pack of 5)
units
900 kHz - - - - 10 V 2 A - Voltage 1 30ns Surface Mount MSOP 35ns
RS Stock No. 170-4473
Mfr. Part No.XRP7664IDTR-F
BrandMaxLinear
TWD13.10
Each (On a Reel of 2500)
units
340 kHz - - - - 16 V 2 A - - 1 - Surface Mount SOIC -