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. 808-4012
Mfr. Part No.UC3843BD1R2G
€0.454
Each (In a Pack of 25)
units
275 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 226-9857
Mfr. Part No.UC3879N
€10.44
Each
units
300 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
RS Stock No. 162-9480
Mfr. Part No.NCP1216D65R2G
€0.475
Each (On a Reel of 2500)
units
71.5 kHz - - - - 10 V 500 mA - Current 1 20ns Surface Mount SOIC 60ns
RS Stock No. 805-2857
Mfr. Part No.UC3842BVD1G
€0.707
Each (In a Pack of 25)
units
275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
New
RS Stock No. 215-9598
Mfr. Part No.BD71837AMWV-E2
BrandROHM
€5.825
Each (In a Pack of 2)
units
2 MHz - - - - - - - - - - - UQFN68CV8080 -
RS Stock No. 168-7317
Mfr. Part No.UC3844BN
€0.71
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-3066
Mfr. Part No.NCP1216AP65G
€0.952
Each (In a Tube of 50)
units
71.5 kHz - - - - 10 V 500 mA - Current 1 20ns Through Hole PDIP 60ns
RS Stock No. 168-7249
Mfr. Part No.UC2843BD1
€0.521
Each (In a Tube of 100)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 178-4669
Mfr. Part No.NCP12400BAHBB0DR2G
€0.724
Each (In a Pack of 10)
units
65 kHz - - - - 14 V 300 mA, 500 mA - Current 1 60ns Surface Mount SOIC 70ns
RS Stock No. 145-6677
Mfr. Part No.UCC28084D
€3.139
Each (In a Tube of 75)
units
1000 kHz - - - - - 1 A - Current 2 25ns Surface Mount SOIC 25ns
RS Stock No. 121-9155
Mfr. Part No.UC3856DW
€4.926
Each (In a Tube of 40)
units
220 kHz - - - - - 1.5 A - Current 2 40ns Surface Mount SOIC 40ns
RS Stock No. 178-4904
Mfr. Part No.HV9120NG-G
BrandMicrochip
€2.553
Each (In a Tube of 45)
units
3 MHz - - - - 4.16 V 10 mA - Current, Voltage 1 75ns Surface Mount SOIC 75ns
RS Stock No. 661-5333
Mfr. Part No.UC3843AD8
€1.366
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 145-4209
Mfr. Part No.UC3842BD1G
€0.565
Each (In a Tube of 98)
units
500 kHz - - - - 4.95 to 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 460-960
Mfr. Part No.LM78S40CN/NOPB
€2.20
Each (In a Pack of 5)
units
100 kHz - - - - 40 V - - - 1 - Through Hole MDIP -
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. 162-9487
Mfr. Part No.NCP1234BD100R2G
€0.42
Each (On a Reel of 2500)
units
108 kHz - - - - 20 V ±500 mA - Current 1 70ns Surface Mount SOIC 70ns
RS Stock No. 786-8878
Mfr. Part No.NCP1251ASN65T1G
€0.144
Each (In a Pack of 10)
units
71 kHz - - - - 28.3 V -500 mA, 300 mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 922-3463
Mfr. Part No.UC3843N
€1.328
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 178-4682
Mfr. Part No.NCP12400CBAAB0DR2G
€0.724
Each (In a Pack of 10)
units
65 kHz - - - - 14 V 300 mA, 500 mA - Current 1 60ns Surface Mount SOIC 70ns