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. 162-6065
FabrikantnummerUCC2801N
€ 2,497
Each (In a Tube of 50)
Aantal stuks
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS-stocknr. 168-7249
FabrikantnummerUC2843BD1
€ 0,444
Each (In a Tube of 100)
Aantal stuks
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS-stocknr. 162-6045
FabrikantnummerUC3842AD
€ 0,96
Each (In a Tube of 50)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 821-5225
FabrikantnummerNCP1396ADR2G
FabrikantON Semiconductor
€ 1,059
Each (In a Pack of 10)
Aantal stuks
575 kHz - - - - - - - Voltage 1 20ns Surface Mount SOIC 40ns
RS-stocknr. 103-5077
FabrikantnummerSG3525ANG
FabrikantON Semiconductor
€ 0,788
Each (In a Tube of 25)
Aantal stuks
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS-stocknr. 169-5531
FabrikantnummerUCC3808N-2
€ 2,951
Each (In a Tube of 50)
Aantal stuks
1000 kHz - - - - - 1 A - Current 2 25ns Through Hole PDIP 25ns
RS-stocknr. 786-8812
FabrikantnummerNCP1216AP65G
FabrikantON Semiconductor
€ 0,972
Each (In a Pack of 5)
Aantal stuks
71.5 kHz - - - - 10 V 500 mA - Current 1 20ns Through Hole PDIP 60ns
RS-stocknr. 759-2922
FabrikantnummerADP2303ARDZ-5.0-R7
FabrikantAnalog Devices
€ 2,83
Each
Aantal stuks
700 kHz - - - - 5 V 3 A - Current 1 280ns Surface Mount SOIC 170ns
RS-stocknr. 922-3451
FabrikantnummerUC3843AD8
€ 1,009
Each (In a Tube of 75)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 162-6036
FabrikantnummerUC3823ADW
€ 12,616
Each (In a Tube of 40)
Aantal stuks
1000 kHz - - - - - 2 A - Current, Voltage 2 20ns Surface Mount SOIC 20ns
RS-stocknr. 121-6370
FabrikantnummerNCP1031DR2G
FabrikantON Semiconductor
€ 0,595
Each (On a Reel of 2500)
Aantal stuks
325 kHz 3mA 140µA 900µA 4 mA - - - - - - Surface Mount SOIC -
RS-stocknr. 193-1547
FabrikantnummerRAA2124214GNP#MA0
€ 1,947
Each (On a Reel of 250)
Aantal stuks
2 MHz, 500 kHz - - - - 0.8 to 5.5 V 1.1 A - - 2 - Surface Mount TDFN -
RS-stocknr. 162-6101
FabrikantnummerUCC38C45D
€ 1,298
Each (In a Tube of 75)
Aantal stuks
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS-stocknr. 911-2957
FabrikantnummerMIC2171WU-TR
FabrikantMicrochip
€ 4,09
Each (In a Pack of 2)
Aantal stuks
115 kHz - - - - 65 V 2.5 A - - 1 - Surface Mount TO-263 -
RS-stocknr. 828-7444
FabrikantnummerAP3105NVKTR-G1
FabrikantDiodesZetex
€ 0,455
Each (In a Pack of 25)
Aantal stuks
70 kHz 20µA 110µA - 2 mA - - - - - - Surface Mount SOT-23 -
RS-stocknr. 162-9677
FabrikantnummerUC3843BVNG
FabrikantON Semiconductor
€ 0,566
Each (In a Tube of 50)
Aantal stuks
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Through Hole PDIP 150ns
RS-stocknr. 162-8993
FabrikantnummerNCP1207APG
FabrikantON Semiconductor
€ 0,775
Each (In a Tube of 50)
Aantal stuks
1000 kHz - - - - - 500 mA - Current 1 20ns Through Hole PDIP 40ns
RS-stocknr. 821-5092
FabrikantnummerNCP1012ST100T3G
FabrikantON Semiconductor
€ 0,802
Each (In a Pack of 20)
Aantal stuks
110 kHz - - - - - 550 mA - Current 1 10ns Surface Mount SOT-223 20ns
RS-stocknr. 197-7618
FabrikantnummerUC3526AN
€ 2,674
Each (In a Tube of 20)
Aantal stuks
600 KHz - - - - - 200 mA - - 2 100ns - PDIP 300ns
RS-stocknr. 877-9120
FabrikantnummerADP2301AUJZ-R2
FabrikantAnalog Devices
€ 2,742
Each (In a Pack of 5)
Aantal stuks
1.75 MHz - - - - 0.8 to 17 V 1.2 A - - 1 - Surface Mount TSOT -