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. 145-6429
Mfr. Part No.ADP2381AREZ-R7
HK$27.326
Each (On a Reel of 1000)
units
1.4 MHz - - - - 3.3 V 6 A - - 1 - Surface Mount TSSOP -
RS Stock No. 796-9010
Mfr. Part No.ADP2381AREZ-R7
HK$39.22
Each (In a Pack of 2)
units
1.4 MHz - - - - 3.3 V 6 A - - 1 - Surface Mount TSSOP -
RS Stock No. 759-2907
Mfr. Part No.ADP2302ARDZ-3.3-R7
HK$25.84
Each
units
700 kHz - - - - 3.3 V 2 A - Current 1 280ns Surface Mount SOIC 170ns
RS Stock No. 742-7720
Mfr. Part No.ADP2301AUJZ-R7
HK$20.795
Each (In a Pack of 2)
units
1.4 MHz - - - - - - - - 1 - Surface Mount TSOT -
RS Stock No. 759-2880
Mfr. Part No.ADP2108AUJZ-1.0-R7
HK$16.348
Each (In a Pack of 5)
units
3000 kHz - - - - 1 V 600 mA - Current 1 - Surface Mount TSOT 550µs
RS Stock No. 823-0016
Mfr. Part No.LTC3723EGN-1#PBF
HK$98.58
Each
units
1 MHz 230µA 700µA 5mA 8 mA - - - - - - Surface Mount SSOP -
RS Stock No. 912-9885
Mfr. Part No.ADP2303ARDZ-5.0-R7
HK$19.56
Each (On a Reel of 1000)
units
700 kHz - - - - 5 V 3 A - Current 1 280ns Surface Mount SOIC 170ns
RS Stock No. 779-9669
Mfr. Part No.LT3573IMSE#PBF
HK$67.52
Each
units
1000 kHz - - - - 5 V 1.55 A - Voltage - - Surface Mount MSOP -
RS Stock No. 759-2922
Mfr. Part No.ADP2303ARDZ-5.0-R7
HK$29.47
Each
units
700 kHz - - - - 5 V 3 A - Current 1 280ns Surface Mount SOIC 170ns
RS Stock No. 822-5866
Mfr. Part No.LT3798EMSE#PBF
HK$53.31
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. 159-8157
Mfr. Part No.ADP2108AUJZ-1.0-R7
HK$10.049
Each (On a Reel of 3000)
units
3000 kHz - - - - 1 V 600 mA - Current 1 - Surface Mount TSOT 550µs
RS Stock No. 471-427
Mfr. Part No.LT1611CS5#TRMPBF
HK$43.86
Each
units
1800 kHz - - - - -5 V - - - - - Surface Mount TSOT-23 -
RS Stock No. 917-3491
Mfr. Part No.LT1611CS5#TRMPBF
HK$37.078
Each (On a Reel of 500)
units
1800 kHz - - - - -5 V - - - - - Surface Mount TSOT-23 -
RS Stock No. 779-9369
Mfr. Part No.LT1619EMS8#PBF
HK$45.68
Each (In a Pack of 2)
units
360 kHz - - - - 5 V - - Current 1 35ns Surface Mount MSOP 30ns
RS Stock No. 779-9268
Mfr. Part No.LT1424IS8-5#PBF
HK$87.88
Each
units
300 kHz - - - - 5 V 1.6 A - Current - - Surface Mount SOIC -
RS Stock No. 411-857
Mfr. Part No.LTC1871EMS#PBF
HK$57.52
Each
units
1000 kHz - - - - 7 V 50 mA - Current 1 100ns Surface Mount MSOP 100ns
RS Stock No. 779-9347
Mfr. Part No.LT1533CS#PBF
HK$100.85
Each
units
250 kHz - - - - 30 V 1 A - - 1 - Surface Mount SOIC -
RS Stock No. 877-9120
Mfr. Part No.ADP2301AUJZ-R2
HK$30.926
Each (In a Pack of 5)
units
1.75 MHz - - - - 0.8 to 17 V 1.2 A - - 1 - Surface Mount TSOT -
RS Stock No. 159-8161
Mfr. Part No.ADP2303ARDZ-3.3-R7
HK$20.169
Each (On a Reel of 1000)
units
700 kHz - - - - 3.3 V 3 A - Current 1 280ns Surface Mount SOIC 170ns
RS Stock No. 761-9248
Mfr. Part No.LTC1871IMS#PBF
HK$66.22
Each
units
360 kHz - - - - -0.3 → 7 V 50 mA - Current 1 100ns Surface Mount MSOP 100ns