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. 753-2964
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
£2.35
Each (In a Pack of 2)
Units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 919-8812
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
£1.998
Each (In a Tube of 50)
Units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 103-5077
Mfr. Part No.SG3525ANG
Brandonsemi
£0.816
Each (In a Tube of 25)
Units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 689-9950
Mfr. Part No.SG3525ANG
Brandonsemi
£0.98
Each (In a Pack of 2)
Units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 528-123
Mfr. Part No.TL494CN
£0.392
Each (In a Tube of 25)
Units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 162-4341
Mfr. Part No.TL5001CP
£1.312
Each (In a Tube of 50)
Units
500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
RS Stock No. 200-6779
Mfr. Part No.TL5001CP
£1.90
Each
Units
500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
RS Stock No. 121-8308
Mfr. Part No.SG3524N
£0.407
Each (In a Tube of 25)
Units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 428-521
Mfr. Part No.SG3524N
£0.51
Each
Units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 517-2986
Mfr. Part No.TL494IN
£0.70
Each (In a Pack of 5)
Units
300 kHz - - - - - 200 mA - - - - Through Hole PDIP -
RS Stock No. 920-3479
Mfr. Part No.TL494IN
£0.61
Each (In a Tube of 25)
Units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 426-263
Mfr. Part No.VIPER22ADIP-E
£1.144
Each (In a Pack of 5)
Units
60 kHz - - - - 730 V - - Current - 100ns Through Hole PDIP 50ns
RS Stock No. 920-8874
Mfr. Part No.VIPER22ADIP-E
£1.00
Each (In a Tube of 50)
Units
60 kHz - - - - 730 V - - Current - 100ns Through Hole PDIP 50ns
RS Stock No. 179-1755
Mfr. Part No.UC3842AD8
£0.711
Each (In a Tube of 75)
Units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 168-7317
Mfr. Part No.UC3844BN
£0.683
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-7847
Mfr. Part No.UC3844BN
£0.705
Each (In a Pack of 10)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-5314
Mfr. Part No.UC3842AD8
£0.99
Each (In a Pack of 5)
Units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 168-8921
Mfr. Part No.SG3525AN
£1.267
Each (In a Tube of 25)
Units
400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 686-5024
Mfr. Part No.UC3843BN
£0.596
Each (In a Pack of 10)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6410
Mfr. Part No.UC3843BN
£0.596
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns