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. 661-5349
Mfr. Part No.UC3843N
$2.628
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 163-2463
Mfr. Part No.MC33067PG
$3.784
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 660-8089
Mfr. Part No.UC3845N
$2.628
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 516-5168
Mfr. Part No.UC3844BNG
$1.97
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-5892
Mfr. Part No.TL3843DR-8
$0.997
Each (On a Reel of 2500)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 145-2968
Mfr. Part No.MC34067PG
$3.812
Each (In a Tube of 25)
units
2200 kHz - - - - 5.2 V 1.5 A - Voltage 2 50ns Through Hole PDIP 50ns
RS Stock No. 805-2844
Mfr. Part No.UC2843BD1G
$0.936
Each (In a Pack of 25)
units
500 kHz - - - - 4.95 to 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 121-8951
Mfr. Part No.UC3524AN
$3.496
Each (In a Tube of 25)
units
500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 660-8079
Mfr. Part No.UC3842N
$2.974
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 919-6478
Mfr. Part No.UC3842BN
$1.056
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-8876
Mfr. Part No.SG2525AN
$1.928
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. 168-6410
Mfr. Part No.UC3843BN
$1.051
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 686-5024
Mfr. Part No.UC3843BN
$1.051
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-4322
Mfr. Part No.KA3525A
$1.288
Each (In a Tube of 25)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 110-9090
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
$1.688
Each (In a Pack of 10)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS Stock No. 922-3463
Mfr. Part No.UC3843N
$2.20
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 923-3849
Mfr. Part No.UC3842N
$2.405
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 686-5033
Mfr. Part No.UC3842BN
$1.062
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-0124
Mfr. Part No.TL3845P
$1.443
Each (In a Tube of 50)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-9283
Mfr. Part No.UC2843BD1G
$0.936
Each (In a Tube of 98)
units
500 kHz - - - - 4.95 to 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns