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. 661-6866
Mfr. Part No.TL494CDR
MYR2.39
Each (In a Pack of 10)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 517-2150
Mfr. Part No.SG3524D
MYR5.25
Each (In a Pack of 5)
units
450 kHz - - - - - 100 (Max) mA - - - - Surface Mount SOIC -
RS Stock No. 145-4652
Mfr. Part No.KA7552A
MYR3.455
Each (In a Tube of 50)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 121-8541
Mfr. Part No.UC3825N
MYR21.284
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 620-0638
Mfr. Part No.UCC3804N
MYR16.024
Each (In a Pack of 5)
units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 169-5584
Mfr. Part No.TL2845P
MYR2.513
Each (In a Tube of 50)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8023
Mfr. Part No.UC2844N
MYR7.402
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 100-8067
Mfr. Part No.NCP1014AP065G
MYR4.274
Each (In a Tube of 50)
units
71 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 145-0370
Mfr. Part No.UC2844N
MYR6.30
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 802-2134
Mfr. Part No.NCP1200P40G
MYR4.641
Each (In a Pack of 10)
units
48 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 862-9375
Mfr. Part No.KA7552A
MYR3.644
Each (In a Pack of 10)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 178-9140
Mfr. Part No.UC2825DW
MYR19.274
Each (In a Tube of 40)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Surface Mount SOIC 30ns
RS Stock No. 919-6478
Mfr. Part No.UC3842BN
MYR2.916
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
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. 460-960
Mfr. Part No.LM78S40CN/NOPB
MYR10.248
Each (In a Pack of 5)
units
100 kHz - - - - 40 V - - - 1 - Through Hole MDIP -
RS Stock No. 121-9164
Mfr. Part No.TL494IDR
MYR0.728
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 517-2986
Mfr. Part No.TL494IN
MYR3.718
Each (In a Pack of 5)
units
300 kHz - - - - - 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 436-3305
Mfr. Part No.UC3825N
MYR25.08
Each
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Through Hole PDIP 30ns
RS Stock No. 516-5146
Mfr. Part No.UC3842BNG
MYR3.71
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 462-4486
Mfr. Part No.UC2875DWP
MYR59.68
Each
units
1000 kHz - - - - - 500 mA - - 4 - Surface Mount SOIC -