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. 661-6875
Mfr. Part No.TL494IDR
SGD0.648
Each (In a Pack of 5)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 795-8473
Mfr. Part No.UC2843BD1
SGD1.289
Each (In a Pack of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 163-2714
Mfr. Part No.UC3845BNG
SGD0.734
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 516-5174
Mfr. Part No.UC3845BNG
SGD0.83
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 922-2423
Mfr. Part No.UC1524AJ
SGD25.427
Each (In a Tube of 21)
units
500 kHz - - - - 5.1 V 200 mA - Voltage 2 200ns Through Hole CDIP 400ns
RS Stock No. 170-8908
Mfr. Part No.AP3105KTR-G1
SGD0.35
Each (On a Reel of 3000)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
RS Stock No. 527-322
Mfr. Part No.UCC2808D-1
SGD4.60
Each
units
1 MHz - - - - - 1 (Max) A - - - - Surface Mount SOIC -
RS Stock No. 168-4860
Mfr. Part No.UCC2808D-1
SGD3.52
Each (In a Tube of 75)
units
1 MHz - - - - - 1 A - - - - Surface Mount SOIC -
RS Stock No. 121-8257
Mfr. Part No.LM5022MM/NOPB
SGD2.014
Each (On a Reel of 1000)
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2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS Stock No. 181-348
Mfr. Part No.LM5022MM/NOPB
SGD4.21
Each (In a Pack of 5)
units
2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS Stock No. 828-7432
Mfr. Part No.AP3105KTR-G1
SGD0.387
Each (In a Pack of 25)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
RS Stock No. 802-3121
Mfr. Part No.NCP1251BSN100T1G
SGD0.81
Each (In a Pack of 20)
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100 kHz - - - - - 500 mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 922-3479
Mfr. Part No.UCC2801D
SGD3.861
Each (In a Tube of 75)
units
- - - - - - - - - - - - - -
RS Stock No. 162-8996
Mfr. Part No.NCP1252BDR2G
SGD0.511
Each (On a Reel of 2500)
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500 kHz - - - - 18 V 800 mA - Current 1 22ns Surface Mount SOIC 26ns
RS Stock No. 802-3130
Mfr. Part No.NCP1252BDR2G
SGD1.122
Each (On a Tape of 10)
units
500 kHz - - - - 18 V 800 mA - Current 1 22ns Surface Mount SOIC 26ns
RS Stock No. 168-6830
Mfr. Part No.UC3845BN
SGD1.048
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-8995
Mfr. Part No.NCP1251BSN100T1G
SGD0.255
Each (On a Reel of 3000)
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100 kHz - - - - - 500 mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 796-8451
Mfr. Part No.UC1524AJ
SGD23.75
Each
units
500 kHz - - - - 5.1 V 200 mA - Voltage 2 200ns Through Hole CDIP 400ns
RS Stock No. 168-7249
Mfr. Part No.UC2843BD1
SGD0.815
Each (In a Tube of 100)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 661-5493
Mfr. Part No.UCC2801D
SGD4.67
Each
units
1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns