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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Omschrijving Prijs 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-stocknr. 759-2907
FabrikantnummerADP2302ARDZ-3.3-R7
FabrikantAnalog Devices
€ 2,43
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Aantal stuks
700 kHz - - - - 3.3 V 2 A - Current 1 280ns Surface Mount SOIC 170ns
RS-stocknr. 920-8874
FabrikantnummerVIPER22ADIP-E
€ 0,722
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Aantal stuks
60 kHz - - - - 730 V - - Current - 100ns Through Hole PDIP 50ns
RS-stocknr. 714-7840
FabrikantnummerUC3845BD1
€ 0,663
Each (In a Pack of 10)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 145-5737
FabrikantnummerUC2843AD8
€ 1,176
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Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 162-9490
FabrikantnummerNCP1250BSN65T1G
FabrikantON Semiconductor
€ 0,139
Each (On a Reel of 3000)
Aantal stuks
71 kHz - - - - 28.3 V -500 mA, 300 mA - Current 1 30ns Surface Mount TSOP 40ns
RS-stocknr. 802-3118
FabrikantnummerNCP1203P60G
FabrikantON Semiconductor
€ 0,755
Each (In a Pack of 10)
Aantal stuks
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS-stocknr. 121-8951
FabrikantnummerUC3524AN
€ 1,778
Each (In a Tube of 25)
Aantal stuks
500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS-stocknr. 786-8907
FabrikantnummerNCP1337PG
FabrikantON Semiconductor
€ 0,882
Each (In a Pack of 5)
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130 kHz - - - - 20 V 500 mA - Current 1 20ns Through Hole PDIP 50ns
RS-stocknr. 121-8952
FabrikantnummerUC3525ADW
€ 1,476
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Aantal stuks
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS-stocknr. 714-1151
FabrikantnummerUC3845BD1013TR
€ 0,605
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 426-263
FabrikantnummerVIPER22ADIP-E
€ 0,854
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Aantal stuks
60 kHz - - - - 730 V - - Current - 100ns Through Hole PDIP 50ns
RS-stocknr. 103-5063
FabrikantnummerNCP1014ST65T3G
FabrikantON Semiconductor
€ 0,365
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71 kHz - - - - - - - Current 1 - Surface Mount SOT-223 20ns
RS-stocknr. 121-8418
FabrikantnummerUC3843AD
€ 1,029
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Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 620-0458
FabrikantnummerUC2843AD8
€ 1,376
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Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 779-9261
FabrikantnummerLT1425IS#PBF
FabrikantAnalog Devices
€ 7,80
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300 kHz - - - - 5 V 1.6 A - Current - - Surface Mount SOIC -
RS-stocknr. 162-6034
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€ 0,878
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400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount PLCC 100ns
RS-stocknr. 159-8159
FabrikantnummerADP2302ARDZ-3.3-R7
FabrikantAnalog Devices
€ 1,429
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Aantal stuks
700 kHz - - - - 3.3 V 2 A - Current 1 280ns Surface Mount SOIC 170ns
RS-stocknr. 168-7402
FabrikantnummerICE3A1565FKLA1
FabrikantInfineon
€ 1,141
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100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns
RS-stocknr. 163-0059
FabrikantnummerNCP1012ST130T3G
FabrikantON Semiconductor
€ 0,382
Each (On a Reel of 4000)
Aantal stuks
143 kHz - - - - - 550 mA - Current 1 10ns Surface Mount SOT-223 20ns
RS-stocknr. 102-8628
FabrikantnummerSG2525AP
€ 1,177
Each (In a Tube of 50)
Aantal stuks
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns