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

...
Read more Read less

Filters

Viewing 1 - 20 of 683 products
Results per page
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. 786-2552
Mfr. Part No.TL594CDR2G
Brandonsemi
HK$8.72
Each (In a Pack of 10)
units
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS Stock No. 162-9675
Mfr. Part No.TL594CDR2G
Brandonsemi
HK$3.977
Each (On a Reel of 2500)
units
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS Stock No. 178-5490
Mfr. Part No.UC1843J
HK$93.269
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 922-3445
Mfr. Part No.UC3526ADW
HK$30.196
Each (In a Tube of 40)
units
- - - - - - - - - - - - - -
RS Stock No. 661-5232
Mfr. Part No.UC3526ADW
HK$35.542
Each (In a Pack of 5)
units
650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS Stock No. 445-573
Mfr. Part No.L6566B
HK$18.786
Each (In a Pack of 5)
units
107 kHz - - - - - 800 mA - - 1 - Surface Mount SOIC -
RS Stock No. 796-8461
Mfr. Part No.UC1843J
HK$158.75
Each
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 166-0930
Mfr. Part No.L6566B
HK$15.954
Each (In a Tube of 30)
units
107 kHz - - - - - 800 mA - - 1 - Surface Mount SOIC -
RS Stock No. 920-3479
Mfr. Part No.TL494IN
HK$7.847
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 163-2713
Mfr. Part No.UC3843BD1G
Brandonsemi
HK$5.912
Each (In a Tube of 98)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 661-5229
Mfr. Part No.UC3525BDW
HK$69.47
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 714-7850
Mfr. Part No.SG3524P
HK$18.315
Each (In a Pack of 2)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS Stock No. 689-9954
Mfr. Part No.UC3843BD1G
Brandonsemi
HK$6.96
Each (In a Pack of 2)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
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. 714-1004
Mfr. Part No.SG3525AP
HK$21.12
Each (In a Pack of 2)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 168-6816
Mfr. Part No.SG3525AP
HK$17.879
Each (In a Tube of 50)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 145-0998
Mfr. Part No.UC3525BDW
HK$59.873
Each (In a Tube of 40)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 168-7318
Mfr. Part No.SG3524P
HK$15.518
Each (In a Tube of 50)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS Stock No. 517-2986
Mfr. Part No.TL494IN
HK$9.144
Each (In a Pack of 5)
units
300 kHz - - - - - 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 145-9136
Mfr. Part No.MIC3172YN
BrandMicrochip
HK$29.288
Each (In a Tube of 50)
units
112 kHz - - - - 65 V 1.25 A - Current 1 - Through Hole PDIP -