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. 169-5594
FabrikantnummerUCC28051D
€ 0,255
Each (In a Tube of 75)
Aantal stuks
200 kHz 0.075mA - - - - - - - - - Surface Mount SOIC -
RS-stocknr. 162-9679
FabrikantnummerUC3845BD1R2G
FabrikantON Semiconductor
€ 0,163
Each (On a Reel of 2500)
Aantal stuks
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS-stocknr. 166-2844
FabrikantnummerFAN7601BMX
FabrikantON Semiconductor
€ 0,307
Each (On a Reel of 3000)
Aantal stuks
300 kHz - - - - 2.5 V 250 mA - Current 1 150ns Surface Mount SOP 150ns
RS-stocknr. 786-6670
FabrikantnummerUC3845BD1R2G
FabrikantON Semiconductor
€ 0,385
Each (In a Pack of 10)
Aantal stuks
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS-stocknr. 772-8878
FabrikantnummerFAN7601BMX
FabrikantON Semiconductor
€ 0,578
Each (In a Pack of 10)
Aantal stuks
300 kHz - - - - 2.5 V 250 mA - Current 1 150ns Surface Mount SOP 150ns
RS-stocknr. 923-3842
FabrikantnummerUC3844N
€ 1,132
Each (In a Tube of 50)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 714-1004
FabrikantnummerSG3525AP
€ 1,425
Each (In a Pack of 2)
Aantal stuks
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS-stocknr. 809-5393
FabrikantnummerTL494CNSR
€ 0,508
Each (In a Pack of 5)
Aantal stuks
300 kHz 9 to 15mA 200mA 200mA 3.5 mA - - Yes - - - Surface Mount SOIC -
RS-stocknr. 516-5691
FabrikantnummerMC33067PG
FabrikantON Semiconductor
€ 2,24
Each
Aantal stuks
- - - - - - - - - - - Through Hole PDIP -
RS-stocknr. 660-8082
FabrikantnummerUC3844N
€ 1,332
Each (In a Pack of 5)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 516-5168
FabrikantnummerUC3844BNG
FabrikantON Semiconductor
€ 0,49
Each
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 145-0370
FabrikantnummerUC2844N
€ 1,154
Each (In a Tube of 50)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 162-6749
FabrikantnummerTL494CNSR
€ 0,188
Each (On a Reel of 2000)
Aantal stuks
300 kHz 9 to 15mA 200mA 200mA 3.5 mA - - Yes - - - Surface Mount SOIC -
RS-stocknr. 121-8957
FabrikantnummerUC3846N
€ 3,408
Each (In a Tube of 25)
Aantal stuks
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS-stocknr. 178-4732
FabrikantnummerUC3844BNG
FabrikantON Semiconductor
€ 0,407
Each (In a Tube of 50)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 791-9153
FabrikantnummerL6566BH
€ 1,167
Each (In a Pack of 10)
Aantal stuks
300 kHz 250µA 480µA 3mA 4.6 mA - - Yes - 1 - Surface Mount SOIC -
RS-stocknr. 163-2463
FabrikantnummerMC33067PG
FabrikantON Semiconductor
€ 1,898
Each (In a Tube of 25)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 168-6816
FabrikantnummerSG3525AP
€ 1,211
Each (In a Tube of 50)
Aantal stuks
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS-stocknr. 660-8023
FabrikantnummerUC2844N
€ 1,354
Each (In a Pack of 5)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 145-9230
FabrikantnummerL6566BH
€ 1,166
Each (In a Tube of 30)
Aantal stuks
300 kHz 250µA 480µA 3mA 4.6 mA - - Yes - 1 - Surface Mount SOIC -