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. 528-123
Mfr. Part No.TL494CN
TWD14.20
Each (In a Tube of 25)
units
300 kHz - - - - 40(Max) V 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 179-2109
Mfr. Part No.UCC3801N
TWD139.10
Each (In a Tube of 50)
units
1000 kHz - - - - - 1 A - Current - 44ns Through Hole PDIP 41ns
RS Stock No. 661-5813
Mfr. Part No.UCC3801N
TWD124.00
Each
units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 661-5232
Mfr. Part No.UC3526ADW
TWD115.60
Each (In a Pack of 5)
units
650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS Stock No. 121-8952
Mfr. Part No.UC3525ADW
TWD60.90
Each (In a Tube of 40)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 922-3445
Mfr. Part No.UC3526ADW
TWD96.30
Each (In a Tube of 40)
units
- - - - - - - - - - - - - -
RS Stock No. 620-0515
Mfr. Part No.UC3525ADW
TWD78.80
Each (In a Pack of 5)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 919-6478
Mfr. Part No.UC3842BN
TWD21.30
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 121-8957
Mfr. Part No.UC3846N
TWD141.10
Each (In a Tube of 25)
units
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS Stock No. 686-5033
Mfr. Part No.UC3842BN
TWD26.80
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 620-0593
Mfr. Part No.UC3846N
TWD166.60
Each (In a Pack of 5)
units
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS Stock No. 145-7139
Mfr. Part No.UC2845D
TWD39.60
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 526-842
Mfr. Part No.UC3843AN
TWD76.20
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 922-3451
Mfr. Part No.UC3843AD8
TWD45.10
Each (In a Tube of 75)
units
- - - - - - - - - - - - - -
RS Stock No. 661-5333
Mfr. Part No.UC3843AD8
TWD49.80
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-8408
Mfr. Part No.UC3843AN
TWD50.50
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 121-9164
Mfr. Part No.TL494IDR
TWD51.60
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 739-0284
Mfr. Part No.KA3525A
TWD32.20
Each (In a Pack of 5)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 923-3842
Mfr. Part No.UC3844N
TWD50.50
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-4322
Mfr. Part No.KA3525A
TWD26.80
Each (In a Tube of 25)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -