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. 168-7402
Mfr. Part No.ICE3A1565FKLA1
BrandInfineon
kr 11,119
Each (In a Tube of 50)
Units
100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 753-2955
Mfr. Part No.ICE3A1565FKLA1
BrandInfineon
kr 13,36
Each (In a Pack of 2)
Units
100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 633-789
Mfr. Part No.SG3524N
kr 14,35
Each
Units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 145-8579
Mfr. Part No.SG3524N
kr 12,189
Each (In a Tube of 25)
Units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 923-3842
Mfr. Part No.UC3844N
kr 12,259
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6816
Mfr. Part No.SG3525AP
kr 12,554
Each (In a Tube of 50)
Units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 714-1004
Mfr. Part No.SG3525AP
kr 14,675
Each (In a Pack of 2)
Units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 686-5002
Mfr. Part No.TSM1052
kr 4,716
Each (In a Pack of 10)
Units
- - - - - 18 V 100 mA - Voltage 1 - Surface Mount SOT-23 -
RS Stock No. 822-5866
Mfr. Part No.LT3798EMSE#PBF
kr 48,38
Each (In a Pack of 2)
Units
150 kHz - - - - 12 V, 24 V, 48 V - - Current, Voltage 1 18ns Surface Mount MSOP 18ns
RS Stock No. 714-7834
Mfr. Part No.UC2844BN
kr 7,11
Each (In a Pack of 10)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 428-521
Mfr. Part No.SG3524N
kr 5,33
Each
Units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 121-8308
Mfr. Part No.SG3524N
kr 4,183
Each (In a Tube of 25)
Units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 761-9244
Mfr. Part No.LTC1871HMS#PBF
kr 72,51
Each
Units
360 kHz - - - - -0.3 to 7 V 50 mA - Current 1 100ns Surface Mount MSOP 100ns
RS Stock No. 733-6416
Mfr. Part No.XRP7664IDTR-F
BrandMaxLinear
kr 3,552
Each (On a Tape of 5)
Units
340 kHz - - - - 16 V 2 A - - 1 - Surface Mount SOIC -
RS Stock No. 880-5364
Mfr. Part No.SG3525AN
kr 12,687
Each (In a Pack of 10)
Units
400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 145-0370
Mfr. Part No.UC2844N
kr 12,546
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6409
Mfr. Part No.TSM1052
kr 5,848
Each (On a Reel of 3000)
Units
- - - - - 18 V 100 mA - Voltage 1 - Surface Mount SOT-23 -
RS Stock No. 660-8023
Mfr. Part No.UC2844N
kr 14,856
Each (In a Pack of 5)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-8921
Mfr. Part No.SG3525AN
kr 12,68
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. 168-7314
Mfr. Part No.UC2844BN
kr 7,106
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns