PWM

PWM stands for Pulse Width Modulation. Electronic circuits can contain both analogue and digital components. PWM allows you to control analogue devices using a digital signal. Many electrical designs use PWM for regulation.

Analogue signals can be on or off, but they can also be half-way on etc. Whereas a digital signal has just on or off positions. Both signals appear in electronic circuits and are required to work together. Inputs can be converted using a DAC or ADC. PWM is available to control the output of a device. For example, a PWM can convert the digital output of a microcontroller (MCU) into an analogue signal, to drive the next analogue component.

Types of PWM device:

  • 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 duty cycle?

PWM signals feature two main things, frequency and a duty cycle. Duty cycle is given as a % 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 is PWM 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. 880-5364
Mfr. Part No.SG3525AN
£1.051
Each (In a Pack of 10)
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400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 527-328
Mfr. Part No.UC3845AD8
£1.018
Each (In a Pack of 5)
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 739-0284
Mfr. Part No.KA3525A
£0.656
Each (In a Pack of 5)
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430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 145-0826
Mfr. Part No.UC3845AD8
£0.865
Each (In a Tube of 75)
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 660-8076
Mfr. Part No.UC3842AN
£1.23
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-4322
Mfr. Part No.KA3525A
£0.544
Each (In a Tube of 25)
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430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 661-6064
Mfr. Part No.UCC3895N
£4.77
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1000 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
RS Stock No. 923-3830
Mfr. Part No.UC3842AN
£1.044
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 922-3498
Mfr. Part No.UCC3895N
£4.28
Each (In a Tube of 20)
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- - - - - - - - - - - - - -
RS Stock No. 761-8342
Mfr. Part No.LT1619ES8#PBF
£3.52
Each
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360 kHz - - - - - 1.5 A - Current 1 35ns Surface Mount SOIC 30ns
RS Stock No. 145-0370
Mfr. Part No.UC2844N
£0.988
Each (In a Tube of 50)
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8023
Mfr. Part No.UC2844N
£1.162
Each (In a Pack of 5)
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 923-3842
Mfr. Part No.UC3844N
£0.977
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8082
Mfr. Part No.UC3844N
£1.142
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 170-3359
Mfr. Part No.UC3844BD1G
£0.41
Each (In a Tube of 98)
Units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-8951
Mfr. Part No.UC3524AN
£1.546
Each (In a Tube of 25)
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500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 463-464
Mfr. Part No.UC3844BD1G
£0.41
Each (In a Pack of 10)
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 181-348
Mfr. Part No.LM5022MM/NOPB
£1.95
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2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS Stock No. 121-8257
Mfr. Part No.LM5022MM/NOPB
£1.039
Each (On a Reel of 1000)
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2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS Stock No. 620-0492
Mfr. Part No.UC3524AN
£1.82
Each (In a Pack of 5)
Units
500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -