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. 145-2786
Mfr. Part No.UC3843BNG
€0.407
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 516-5152
Mfr. Part No.UC3843BNG
€0.49
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
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. 166-1619
Mfr. Part No.FAN7602CMX
€0.23
Each (On a Reel of 2500)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 772-8878
Mfr. Part No.FAN7601BMX
€0.578
Each (In a Pack of 10)
units
300 kHz - - - - 2.5 V 250 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 772-8871
Mfr. Part No.FAN7602CMX
€0.549
Each (In a Pack of 10)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 163-2463
Mfr. Part No.MC33067PG
€1.898
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 516-5691
Mfr. Part No.MC33067PG
€2.24
Each
units
- - - - - - - - - - - Through Hole PDIP -
RS Stock No. 786-6696
Mfr. Part No.MC33060ADR2G
€0.736
Each (In a Pack of 5)
units
11.5 kHz - - - - 40 V 200 mA - Voltage 1 200ns Surface Mount SOIC 200ns
RS Stock No. 162-9392
Mfr. Part No.MC33060ADR2G
€0.656
Each (On a Reel of 2500)
units
11.5 kHz - - - - 40 V 200 mA - Voltage 1 200ns Surface Mount SOIC 200ns
RS Stock No. 464-306
Mfr. Part No.NCP1013AP133G
€0.888
Each (In a Pack of 5)
units
143 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 862-9384
Mfr. Part No.KA7553A
€0.275
Each (In a Pack of 10)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 786-8888
Mfr. Part No.NCP1252CDR2G
€0.728
Each (In a Pack of 5)
units
550 kHz - - - - 10 V -800 mA, 500 mA - Current 1 22ns Surface Mount SOIC 26ns
RS Stock No. 162-8993
Mfr. Part No.NCP1207APG
€0.775
Each (In a Tube of 50)
units
1000 kHz - - - - - 500 mA - Current 1 20ns Through Hole PDIP 40ns
RS Stock No. 166-2436
Mfr. Part No.FAN7621SSJX
€0.585
Each (On a Reel of 2000)
units
300 kHz - 360mA 0.6A 9 mA - - - - - - Surface Mount SOP -
RS Stock No. 162-8995
Mfr. Part No.NCP1251BSN100T1G
€0.151
Each (On a Reel of 3000)
units
100 kHz - - - - - 500 mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 464-316
Mfr. Part No.NCP1014AP100G
€0.914
Each (In a Pack of 5)
units
110 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 805-6749
Mfr. Part No.UC3843BVDG
€0.24
Each (In a Pack of 25)
units
275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 163-0829
Mfr. Part No.UC3843BD1R2G
€0.179
Each (On a Reel of 2500)
units
275 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 178-4732
Mfr. Part No.UC3844BNG
€0.407
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns