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. 170-3376
Mfr. Part No.NCP12510BSN65T1G
€0.118
Each (On a Reel of 3000)
units
65 kHz - - - - 8 to 14 V 300 mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 917-3491
Mfr. Part No.LT1611CS5#TRMPBF
€2.634
Each (On a Reel of 500)
units
1800 kHz - - - - -5 V - - - - - Surface Mount TSOT-23 -
RS Stock No. 180-8390
Mfr. Part No.ISL81401AFRZ-T7A
€4.127
Each (On a Reel of 250)
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -
RS Stock No. 463-464
Mfr. Part No.UC3844BD1G
€0.523
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 184-8191
Mfr. Part No.BD49101AEFS-ME2
BrandROHM
€5.538
Each (In a Pack of 5)
units
500 kHz - - - - - 1.5 A - - - - Surface Mount HTSSOP -
RS Stock No. 922-3445
Mfr. Part No.UC3526ADW
€2.656
Each (In a Tube of 40)
units
- - - - - - - - - - - - - -
RS Stock No. 168-7316
Mfr. Part No.UC3845BD1
€0.518
Each (In a Tube of 100)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 714-7866
Mfr. Part No.VIPER12ASTR-E
€0.944
Each (In a Pack of 5)
units
60 kHz - - - - 730 V - - Current - 100ns Surface Mount SOIC 50ns
RS Stock No. 145-5980
Mfr. Part No.TL494CDR
€0.105
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 162-6065
Mfr. Part No.UCC2801N
€2.871
Each (In a Tube of 50)
units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 795-8473
Mfr. Part No.UC2843BD1
€0.767
Each (In a Pack of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 773-7784
Mfr. Part No.MC33363ADWR2G
€3.26
Each
units
315 kHz - - - - 7.5 V - - - 1 - Surface Mount SOIC W -
RS Stock No. 178-4290
Mfr. Part No.NCP4060AMNTXG
€2.872
Each (On a Reel of 2500)
units
500 kHz - - - - 5.6 V 6 A - - 1 - Surface Mount QFN -
RS Stock No. 464-306
Mfr. Part No.NCP1013AP133G
€1.022
Each (In a Pack of 5)
units
143 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 786-8869
Mfr. Part No.NCP1234BD100R2G
€1.032
Each (In a Pack of 5)
units
108 kHz - - - - 20 V ±500 mA - Current 1 70ns Surface Mount SOIC 70ns
RS Stock No. 162-8993
Mfr. Part No.NCP1207APG
€0.891
Each (In a Tube of 50)
units
1000 kHz - - - - - 500 mA - Current 1 20ns Through Hole PDIP 40ns
RS Stock No. 761-5255
Mfr. Part No.LM5020SD-1/NOPB
€1.034
Each (In a Pack of 5)
units
1000 kHz - - - - - 1 A - Current 1 15ns Surface Mount LLP 18ns
RS Stock No. 178-4515
Mfr. Part No.NCP4306DADZZDASNT1G
€0.578
Each (In a Pack of 10)
units
1 MHz - - - - 11 V 2 A, 7 A - - 1 - Surface Mount TSOP -
RS Stock No. 821-3232
Mfr. Part No.NCP1012AP100G
€0.949
Each (In a Pack of 20)
units
110 kHz - - - - - - - Current 1 10ns Through Hole PDIP 20ns
RS Stock No. 180-8391
Mfr. Part No.ISL81401FRZ-T7A
€3.672
Each (On a Reel of 250)
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -