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. 166-0829
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
R 8.772
Each (On a Reel of 2500)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS stock no. 110-9090
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
R 22.00
Each (In a Pack of 10)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS stock no. 168-6816
Mfr. Part No.SG3525AP
R 18.48
Each (In a Tube of 50)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS stock no. 857-8510
Mfr. Part No.ICE3B0365JFKLA1
BrandInfineon
R 17.707
Each (In a Tube of 2000)
units
76 kHz - - - - - - - Current 1 30ns Through Hole PDIP 30ns
RS stock no. 714-1004
Mfr. Part No.SG3525AP
R 39.865
Each (In a Pack of 2)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS stock no. 181-348
Mfr. Part No.LM5022MM/NOPB
R 41.998
Each (In a Pack of 5)
units
2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS stock no. 121-8257
Mfr. Part No.LM5022MM/NOPB
R 22.37
Each (On a Reel of 1000)
units
2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS stock no. 168-8921
Mfr. Part No.SG3525AN
R 23.082
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. 162-8995
Mfr. Part No.NCP1251BSN100T1G
R 3.056
Each (On a Reel of 3000)
units
100 kHz - - - - - 500 mA - Current 1 30ns Surface Mount TSOP 40ns
RS stock no. 753-2964
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
R 56.85
Each (In a Pack of 2)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS stock no. 802-3121
Mfr. Part No.NCP1251BSN100T1G
R 7.355
Each (In a Pack of 20)
units
100 kHz - - - - - 500 mA - Current 1 30ns Surface Mount TSOP 40ns
RS stock no. 919-8812
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
R 33.514
Each (In a Tube of 50)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS stock no. 923-3849
Mfr. Part No.UC3842N
R 21.654
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS stock no. 880-5364
Mfr. Part No.SG3525AN
R 23.065
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. 660-8079
Mfr. Part No.UC3842N
R 25.68
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS stock no. 919-8825
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
R 28.454
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS stock no. 778-0902
Mfr. Part No.XRP7665IDBTR-F
BrandMaxLinear
R 13.979
Each (In a Pack of 10)
units
400 kHz - - - - 0.925 to 16 V 3 A - - 1 - Surface Mount SOIC -
RS stock no. 462-7249
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
R 45.742
Each (In a Pack of 5)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS stock no. 913-4357
Mfr. Part No.XRP7665IDBTR-F
BrandMaxLinear
R 7.852
Each (On a Reel of 2500)
units
400 kHz - - - - 0.925 to 16 V 3 A - - 1 - Surface Mount SOIC -
RS stock no. 919-8816
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
R 42.724
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -