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 727 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. 660-8089
Mfr. Part No.UC3845N
MYR7.182
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 923-3855
Mfr. Part No.UC3845N
MYR6.521
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-1004
Mfr. Part No.SG3525AP
MYR7.425
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
MYR5.996
Each (In a Tube of 50)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 121-8308
Mfr. Part No.SG3524N
MYR2.268
Each (In a Tube of 25)
units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 428-521
Mfr. Part No.SG3524N
MYR2.67
Each
units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 739-0284
Mfr. Part No.KA3525A
MYR4.158
Each (In a Pack of 5)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 145-4322
Mfr. Part No.KA3525A
MYR3.454
Each (In a Tube of 25)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 166-0829
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
MYR3.004
Each (On a Reel of 2500)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS Stock No. 170-3359
Mfr. Part No.UC3844BD1G
MYR2.803
Each (In a Tube of 98)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 463-464
Mfr. Part No.UC3844BD1G
MYR2.982
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 110-9090
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
MYR5.649
Each (In a Pack of 10)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS Stock No. 415-1045
Mfr. Part No.L6598D
MYR11.55
Each
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 796-8461
Mfr. Part No.UC1843J
MYR48.41
Each
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 168-6083
Mfr. Part No.L6598D
MYR8.757
Each (In a Tube of 50)
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 178-5490
Mfr. Part No.UC1843J
MYR46.434
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 919-8812
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
MYR9.681
Each (In a Tube of 50)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 528-123
Mfr. Part No.TL494CN
MYR1.732
Each (In a Tube of 25)
units
300 kHz - - - - 40(Max) V 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 753-2964
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
MYR11.38
Each (In a Pack of 2)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 772-8871
Mfr. Part No.FAN7602CMX
MYR3.203
Each (In a Pack of 10)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns