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. 168-6083
Mfr. Part No.L6598D
€1.926
Each (In a Tube of 50)
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 415-1045
Mfr. Part No.L6598D
€2.27
Each
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 877-2826
Mfr. Part No.SG2525AN
€1.258
Each (In a Pack of 10)
units
400 kHz 80µA 400mA 400mA 20 mA 5.05 to 5.15 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 168-8876
Mfr. Part No.SG2525AN
€1.195
Each (In a Tube of 25)
units
400 kHz 80µA 400mA 400mA 20 mA 5.05 to 5.15 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 462-7249
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
€2.994
Each (In a Pack of 5)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 919-8825
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
€2.457
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 919-8816
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
€2.526
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 516-5152
Mfr. Part No.UC3843BNG
€0.85
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-2786
Mfr. Part No.UC3843BNG
€0.749
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 527-007
Mfr. Part No.UC3843AD
€1.404
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-8418
Mfr. Part No.UC3843AD
€1.193
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 517-2986
Mfr. Part No.TL494IN
€0.778
Each (In a Pack of 5)
units
300 kHz - - - - - 200 mA - - - - Through Hole PDIP -
RS Stock No. 920-3479
Mfr. Part No.TL494IN
€0.592
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 166-2844
Mfr. Part No.FAN7601BMX
€0.307
Each (On a Reel of 3000)
units
300 kHz - - - - 2.5 V 250 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 919-8812
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
€2.012
Each (In a Tube of 50)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 166-1619
Mfr. Part No.FAN7602CMX
€0.28
Each (On a Reel of 2500)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 772-8871
Mfr. Part No.FAN7602CMX
€0.632
Each (In a Pack of 10)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 753-2964
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
€2.34
Each (In a Pack of 2)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 528-123
Mfr. Part No.TL494CN
€0.435
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 686-5024
Mfr. Part No.UC3843BN
€0.646
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns