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 13,196
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 17,72
Each (In a Pack of 2)
Units
100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 145-8579
Mfr. Part No.SG3524N
kr 30,549
Each (In a Tube of 25)
Units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 633-789
Mfr. Part No.SG3524N
kr 33,81
Each
Units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 880-5364
Mfr. Part No.SG3525AN
kr 22,123
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. 686-5002
Mfr. Part No.TSM1052
kr 11,056
Each (In a Pack of 10)
Units
- - - - - 18 V 100 mA - Voltage 1 - Surface Mount SOT-23 -
RS Stock No. 145-0370
Mfr. Part No.UC2844N
kr 17,727
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-7834
Mfr. Part No.UC2844BN
kr 12,198
Each (In a Pack of 10)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-8921
Mfr. Part No.SG3525AN
kr 20,786
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. 428-521
Mfr. Part No.SG3524N
kr 7,61
Each
Units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 660-8082
Mfr. Part No.UC3844N
kr 19,482
Each (In a Pack of 5)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8023
Mfr. Part No.UC2844N
kr 19,156
Each (In a Pack of 5)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 923-3842
Mfr. Part No.UC3844N
kr 16,751
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 7,129
Each (On a Reel of 3000)
Units
- - - - - 18 V 100 mA - Voltage 1 - Surface Mount SOT-23 -
RS Stock No. 121-8308
Mfr. Part No.SG3524N
kr 5,579
Each (In a Tube of 25)
Units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 168-7314
Mfr. Part No.UC2844BN
kr 11,752
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 822-5866
Mfr. Part No.LT3798EMSE#PBF
kr 81,425
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. 528-123
Mfr. Part No.TL494CN
kr 8,423
Each (In a Tube of 25)
Units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 184-1124
Mfr. Part No.UC2845BD1G
Brandonsemi
kr 7,75
Each (In a Tube of 98)
Units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole SOIC 150ns
RS Stock No. 168-6083
Mfr. Part No.L6598D
kr 44,399
Each (In a Tube of 50)
Units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -