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


Viewing 721 - 727 of 727 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. 184-8244
Mfr. Part No.BA17807CP-E2
Each (In a Pack of 5)
- - - - - 7 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 526-947
Mfr. Part No.SG2524DR
Each (In a Pack of 10)
450 kHz - - - - - 100 (Max) mA - - - - Surface Mount SOIC -
RS Stock No. 162-6269
Mfr. Part No.LM5020SD-1/NOPB
Each (On a Reel of 1000)
1000 kHz - - - - - 1 A - Current 1 15ns Surface Mount LLP 18ns
RS Stock No. 166-3260
Mfr. Part No.FAN6224M
Each (On a Reel of 2500)
140 kHz - - - - 14 V - - - 1 - Surface Mount SOP -
RS Stock No. 145-5766
Mfr. Part No.UCC2889N
Each (In a Tube of 50)
250 kHz - - - - 18 V - - Voltage 1 30ns Through Hole PDIP 35ns
RS Stock No. 761-5252
Mfr. Part No.LM5033SD/NOPB
Each (On a Tape of 5)
1000 kHz - - - - 9.75 V 1.5 A - Voltage 2 16ns Surface Mount LLP 16ns
RS Stock No. 185-9316
Mfr. Part No.NCV1063AD100R2G
Each (In a Pack of 6)
100 kHz - - - - 670 V 780 mA - - - 10ns Surface Mount SOIC 20ns