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
PHP32.881
Each (In a Tube of 25)
units
300 kHz - - - - 40(Max) V 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 660-8076
Mfr. Part No.UC3842AN
PHP85.408
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 179-1755
Mfr. Part No.UC3842AD8
PHP57.624
Each (In a Tube of 75)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 923-3830
Mfr. Part No.UC3842AN
PHP76.661
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-5314
Mfr. Part No.UC3842AD8
PHP106.712
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-9164
Mfr. Part No.TL494IDR
PHP99.029
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 661-6875
Mfr. Part No.TL494IDR
PHP103.556
Each (In a Pack of 5)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 121-8975
Mfr. Part No.UCC28C45D
PHP80.456
Each (In a Tube of 75)
units
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS Stock No. 628-2860
Mfr. Part No.UCC28C45D
PHP98.27
Each (In a Pack of 5)
units
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS Stock No. 121-8257
Mfr. Part No.LM5022MM/NOPB
PHP84.893
Each (On a Reel of 1000)
units
2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS Stock No. 121-8408
Mfr. Part No.UC3843AN
PHP76.661
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 181-348
Mfr. Part No.LM5022MM/NOPB
PHP138.664
Each (In a Pack of 5)
units
2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS Stock No. 517-2986
Mfr. Part No.TL494IN
PHP43.732
Each (In a Pack of 5)
units
300 kHz - - - - - 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 162-4865
Mfr. Part No.TL5001ACD
PHP90.886
Each (In a Tube of 75)
units
- - - - - 1 to 50 V 3 A - - 1 - Surface Mount SOIC -
RS Stock No. 920-3479
Mfr. Part No.TL494IN
PHP38.178
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 661-5229
Mfr. Part No.UC3525BDW
PHP333.90
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 462-2418
Mfr. Part No.TL5001ACD
PHP129.654
Each (In a Pack of 5)
units
- - - - - - 3 (Max) A - - - - Surface Mount SOIC -
RS Stock No. 145-0998
Mfr. Part No.UC3525BDW
PHP290.178
Each (In a Tube of 40)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 526-842
Mfr. Part No.UC3843AN
PHP84.61
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-6866
Mfr. Part No.TL494CDR
PHP27.968
Each (In a Pack of 10)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns