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. 922-3445
Mfr. Part No.UC3526ADW
HK$23.315
Each (In a Tube of 40)
units
- - - - - - - - - - - - - -
RS Stock No. 796-8461
Mfr. Part No.UC1843J
HK$147.90
Each
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 661-5232
Mfr. Part No.UC3526ADW
HK$29.716
Each (In a Pack of 5)
units
650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS Stock No. 178-5490
Mfr. Part No.UC1843J
HK$86.425
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 145-0998
Mfr. Part No.UC3525BDW
HK$46.978
Each (In a Tube of 40)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 920-3479
Mfr. Part No.TL494IN
HK$6.668
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 145-5764
Mfr. Part No.UC2525AN
HK$18.509
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 661-4989
Mfr. Part No.UC2525AN
HK$23.33
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 517-2986
Mfr. Part No.TL494IN
HK$7.634
Each (In a Pack of 5)
units
300 kHz - - - - - 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 661-5229
Mfr. Part No.UC3525BDW
HK$58.76
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 923-3830
Mfr. Part No.UC3842AN
HK$13.388
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 121-8408
Mfr. Part No.UC3843AN
HK$13.388
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 121-8951
Mfr. Part No.UC3524AN
HK$19.404
Each (In a Tube of 25)
units
500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 661-5535
Mfr. Part No.UCC28051D
HK$8.62
Each (In a Pack of 5)
units
200 kHz 0.075mA - - - - - - - - - Surface Mount SOIC -
RS Stock No. 145-5977
Mfr. Part No.UCC35701N
HK$72.275
Each (In a Tube of 25)
units
700 kHz - - - - - 1 A - Voltage 1 20ns Through Hole PDIP 20ns
RS Stock No. 922-3479
Mfr. Part No.UCC2801D
HK$23.093
Each (In a Tube of 75)
units
- - - - - - - - - - - - - -
RS Stock No. 528-123
Mfr. Part No.TL494CN
HK$10.684
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
HK$14.732
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-5493
Mfr. Part No.UCC2801D
HK$27.05
Each
units
1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS Stock No. 526-842
Mfr. Part No.UC3843AN
HK$14.732
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns