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. 620-0638
Mfr. Part No.UCC3804N
MYR14.12
Each (In a Pack of 5)
units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 462-4486
Mfr. Part No.UC2875DWP
MYR53.92
Each
units
1000 kHz - - - - - 500 mA - - 4 - Surface Mount SOIC -
RS Stock No. 753-2955
Mfr. Part No.ICE3A1565FKLA1
BrandInfineon
MYR11.55
Each (In a Pack of 2)
units
100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 168-6471
Mfr. Part No.L6598
MYR8.181
Each (In a Tube of 25)
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Through Hole PDIP -
RS Stock No. 145-5980
Mfr. Part No.TL494CDR
MYR0.596
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 165-4035
Mfr. Part No.MIC2171WU-TR
BrandMicrochip
MYR14.898
Each (On a Reel of 750)
units
115 kHz - - - - 65 V 2.5 A - - 1 - Surface Mount TO-263 -
RS Stock No. 145-5737
Mfr. Part No.UC2843AD8
MYR5.64
Each (In a Tube of 75)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 862-9375
Mfr. Part No.KA7552A
MYR2.668
Each (In a Pack of 10)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 162-8991
Mfr. Part No.NCP1203D60R2G
MYR1.903
Each (On a Reel of 2500)
units
60 kHz - - - - - 250 mA - Current 1 28ns Surface Mount SOIC 67ns
RS Stock No. 620-0464
Mfr. Part No.UC2825DW
MYR23.522
Each (In a Pack of 5)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Surface Mount SOIC 30ns
RS Stock No. 463-357
Mfr. Part No.NCP1014AP065G
MYR4.546
Each (In a Pack of 5)
units
71 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 628-2804
Mfr. Part No.UCC28C44D
MYR8.106
Each (In a Pack of 5)
units
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS Stock No. 786-6696
Mfr. Part No.MC33060ADR2G
MYR4.446
Each (In a Pack of 5)
units
11.5 kHz - - - - 40 V 200 mA - Voltage 1 200ns Surface Mount SOIC 200ns
RS Stock No. 661-5229
Mfr. Part No.UC3525BDW
MYR23.23
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 922-3451
Mfr. Part No.UC3843AD8
MYR4.863
Each (In a Tube of 75)
units
- - - - - - - - - - - - - -
RS Stock No. 922-3454
Mfr. Part No.UC3823N
MYR18.757
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 660-8108
Mfr. Part No.UCC3808N-2
MYR16.73
Each
units
1000 kHz - - - - - 1 A - Current 2 25ns Through Hole PDIP 25ns
RS Stock No. 661-5718
Mfr. Part No.UCC28513DW
MYR18.41
Each
units
230 kHz 0.1mA - - - - - - - - - Surface Mount SOIC -
RS Stock No. 180-8393
Mfr. Part No.ISL81401AFRZ-T7A
MYR27.26
Each
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -
RS Stock No. 162-5892
Mfr. Part No.TL3843DR-8
MYR2.586
Each (On a Reel of 2500)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Surface Mount SOIC 50ns