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

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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. 184-8293
Mfr. Part No.BA7815CP-E2
BrandROHM
£0.606
Each (In a Pack of 10)
Units
- - - - - 15 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 184-8161
Mfr. Part No.BA17810FP-E2
BrandROHM
£0.921
Each (In a Pack of 10)
Units
- - - - - 10 V 1 A - - - - Surface Mount TO-252 -
RS Stock No. 184-8270
Mfr. Part No.BA17809CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 9 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 184-5294
Mfr. Part No.BUS1DJC3GWZ-E2
BrandROHM
£0.344
Each (In a Pack of 25)
Units
- - - - - - 2 A - - - - Surface Mount UCSP -
RS Stock No. 184-8174
Mfr. Part No.BA17812CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 12 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 184-8253
Mfr. Part No.BA178M07CP-E2
BrandROHM
£1.346
Each (In a Pack of 5)
Units
- - - - - 7 V 500 mA - - - - Through Hole TO-220CP -
RS Stock No. 184-8210
Mfr. Part No.BD81870EFV-ME2
BrandROHM
£2.784
Each (In a Pack of 5)
Units
2.1 MHz - - - - 18 V - - - - - Surface Mount HTSSOP -
RS Stock No. 184-8282
Mfr. Part No.BA17810CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 10 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 184-8240
Mfr. Part No.BA178M05CP-E2
BrandROHM
£1.392
Each (In a Pack of 5)
Units
- - - - - 5 V 500 mA - - - - Through Hole TO-220CP -
RS Stock No. 184-8230
Mfr. Part No.BA17806CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 6 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 184-8194
Mfr. Part No.BA17815CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 15 V 1 A - - - - Through Hole TO-220CP -
New
RS Stock No. 215-9599
Mfr. Part No.BD71850MWV-E2
BrandROHM
£2.648
Each (On a Reel of 1500)
Units
2 MHz - - - - - - - - - - - UQFN56BV7070 -
RS Stock No. 184-8256
Mfr. Part No.BA17808CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 8 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 184-8267
Mfr. Part No.BA178M12CP-E2
BrandROHM
£1.346
Each (In a Pack of 5)
Units
- - - - - 12 V 500 mA - - - - Through Hole TO-220CP -
New
RS Stock No. 215-9598
Mfr. Part No.BD71837AMWV-E2
BrandROHM
£5.25
Each (In a Pack of 2)
Units
2 MHz - - - - - - - - - - - UQFN68CV8080 -
RS Stock No. 184-8279
Mfr. Part No.BA7812FP-E2
BrandROHM
£0.727
Each (In a Pack of 10)
Units
- - - - - 12 V 1 A - - - - Surface Mount TO-252 -
RS Stock No. 184-8226
Mfr. Part No.BA17824CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 24 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 184-8191
Mfr. Part No.BD49101AEFS-ME2
BrandROHM
£4.988
Each (In a Pack of 5)
Units
500 kHz - - - - - 1.5 A - - - - Surface Mount HTSSOP -
RS Stock No. 184-8214
Mfr. Part No.BA17818CP-E2
BrandROHM
£1.30
Each (In a Pack of 5)
Units
- - - - - 18 V 1 A - - - - Through Hole TO-220CP -
New
RS Stock No. 215-9597
Mfr. Part No.BD71837AMWV-E2
BrandROHM
£3.043
Each (On a Reel of 1000)
Units
2 MHz - - - - - - - - - - - UQFN68CV8080 -