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. 165-4050
Mfr. Part No.MIC2172YM-TR
BrandMicrochip
R 22.28
Each (On a Reel of 2500)
units
115 kHz - - - - 65 V 1.25 A - Current 1 - Surface Mount SOIC -
RS stock no. 911-2727
Mfr. Part No.MIC2172YM-TR
BrandMicrochip
R 20.304
Each (In a Pack of 5)
units
115 kHz - - - - 65 V 1.25 A - Current 1 - Surface Mount SOIC -
RS stock no. 773-6719
Mfr. Part No.MCP1631V-E/ST
BrandMicrochip
R 36.464
Each (In a Pack of 5)
units
2 MHz - - - - 3.3 V, 5 V 250 mA - Voltage - 18ns Surface Mount TSSOP 18ns
RS stock no. 159-7545
Mfr. Part No.MIC3172YM
BrandMicrochip
R 35.977
Each (In a Tube of 95)
units
112 kHz - - - - 65 V 1.25 A - Current 1 - Surface Mount SOIC -
RS stock no. 178-4904
Mfr. Part No.HV9120NG-G
BrandMicrochip
R 49.65
Each (In a Tube of 45)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Surface Mount SOIC 75ns
RS stock no. 911-2957
Mfr. Part No.MIC2171WU-TR
BrandMicrochip
R 75.735
Each (In a Pack of 2)
units
115 kHz - - - - 65 V 2.5 A - - 1 - Surface Mount TO-263 -
RS stock no. 829-3373
Mfr. Part No.HV9120P-G
BrandMicrochip
R 50.60
Each (In a Pack of 5)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Through Hole PDIP 75ns
RS stock no. 910-1553
Mfr. Part No.MIC3172YM
BrandMicrochip
R 43.502
Each (In a Pack of 5)
units
112 kHz - - - - 65 V 1.25 A - Current 1 - Surface Mount SOIC -
RS stock no. 910-1562
Mfr. Part No.MIC3172YN
BrandMicrochip
R 52.805
Each (In a Pack of 2)
units
112 kHz - - - - 65 V 1.25 A - Current 1 - Through Hole PDIP -
RS stock no. 829-3376
Mfr. Part No.HV9123NG-G
BrandMicrochip
R 65.002
Each (In a Pack of 5)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Surface Mount SOIC 75ns
RS stock no. 829-3364
Mfr. Part No.HV9120NG-G
BrandMicrochip
R 59.412
Each (In a Pack of 5)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Surface Mount SOIC 75ns
RS stock no. 145-9136
Mfr. Part No.MIC3172YN
BrandMicrochip
R 44.42
Each (In a Tube of 50)
units
112 kHz - - - - 65 V 1.25 A - Current 1 - Through Hole PDIP -
RS stock no. 178-4853
Mfr. Part No.HV9120P-G
BrandMicrochip
R 50.47
Each (In a Tube of 24)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Through Hole PDIP 75ns
RS stock no. 178-4905
Mfr. Part No.HV9123NG-G
BrandMicrochip
R 54.38
Each (In a Tube of 45)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Surface Mount SOIC 75ns
RS stock no. 165-4035
Mfr. Part No.MIC2171WU-TR
BrandMicrochip
R 57.46
Each (On a Reel of 750)
units
115 kHz - - - - 65 V 2.5 A - - 1 - Surface Mount TO-263 -
RS stock no. 774-7422
Mfr. Part No.MCP1630V-E/MS
BrandMicrochip
R 19.438
Each (In a Bag of 5)
units
1 MHz - -9mA 11mA 4.5 mA - - - - - - Surface Mount MSOP -
RS stock no. 165-2137
Mfr. Part No.MCP1630V-E/MS
BrandMicrochip
R 16.407
Each (In a Tube of 100)
units
1 MHz - -9mA 11mA 4.5 mA - - - - - - Surface Mount MSOP -