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. 620-0492
Mfr. Part No.UC3524AN
TWD87.20
Each (In a Pack of 5)
units
500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 516-5146
Mfr. Part No.UC3842BNG
TWD26.00
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 686-5024
Mfr. Part No.UC3843BN
TWD22.10
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 527-322
Mfr. Part No.UCC2808D-1
TWD108.00
Each
units
1 MHz - - - - - 1 (Max) A - - - - Surface Mount SOIC -
RS Stock No. 168-4860
Mfr. Part No.UCC2808D-1
TWD79.20
Each (In a Tube of 75)
units
1 MHz - - - - - 1 A - - - - Surface Mount SOIC -
RS Stock No. 145-0807
Mfr. Part No.UC2842AN
TWD45.20
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6410
Mfr. Part No.UC3843BN
TWD22.10
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-6052
Mfr. Part No.UCC3889N
TWD96.40
Each (In a Pack of 5)
units
250 kHz - - - - 18 V - - Voltage 1 30ns Through Hole PDIP 35ns
RS Stock No. 778-0902
Mfr. Part No.XRP7665IDBTR-F
BrandMaxLinear
TWD34.30
Each (In a Pack of 10)
units
400 kHz - - - - 0.925 → 16 V 3 A - - 1 - Surface Mount SOIC -
RS Stock No. 805-2848
Mfr. Part No.UC3842BD1G
TWD20.80
Each (In a Pack of 25)
units
500 kHz - - - - 4.95 to 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 786-2451
Mfr. Part No.NCP3020ADR2G
TWD35.30
Each (In a Pack of 10)
units
350 kHz 5.5mA 100µA 100µA 8 mA - - - - - - Surface Mount SOIC -
RS Stock No. 920-3479
Mfr. Part No.TL494IN
TWD25.20
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 661-5245
Mfr. Part No.UC3823ADW
TWD608.00
Each
units
1000 kHz - - - - - 2 A - Current, Voltage 2 20ns Surface Mount SOIC 20ns
RS Stock No. 162-6094
Mfr. Part No.UCC3889N
TWD75.80
Each (In a Tube of 50)
units
250 kHz - - - - 18 V - - Voltage 1 30ns Through Hole PDIP 35ns
RS Stock No. 920-3618
Mfr. Part No.LM2611AMF/NOPB
TWD97.40
Each (On a Reel of 1000)
units
1400 kHz - - - - -1.23 V - - - 1 - Surface Mount SOT-23 -
RS Stock No. 415-1045
Mfr. Part No.L6598D
TWD80.00
Each
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 786-6677
Mfr. Part No.UC3844BDR2G
TWD16.70
Each (In a Pack of 10)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 162-8992
Mfr. Part No.NCP1203P60G
TWD30.20
Each (In a Tube of 50)
units
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 923-3849
Mfr. Part No.UC3842N
TWD50.50
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8085
Mfr. Part No.UC3845AN
TWD58.60
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns