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. 620-0543
Mfr. Part No.UC3525AN
$4.22
Each (In a Pack of 5)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 661-5314
Mfr. Part No.UC3842AD8
$2.496
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 179-1755
Mfr. Part No.UC3842AD8
$1.806
Each (In a Tube of 75)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-8954
Mfr. Part No.UC3525AN
$3.465
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 919-8816
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
$3.996
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 121-8408
Mfr. Part No.UC3843AN
$2.405
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 426-241
Mfr. Part No.VIPER12ADIP-E
$1.812
Each (In a Pack of 5)
units
- - - - - - - - - - - Through Hole PDIP -
RS Stock No. 168-5809
Mfr. Part No.VIPER12ADIP-E
$0.956
Each (In a Tube of 50)
units
- - - - - - - - - - - Through Hole PDIP -
RS Stock No. 620-0593
Mfr. Part No.UC3846N
$8.802
Each (In a Pack of 5)
units
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS Stock No. 178-5492
Mfr. Part No.UC1844J
$40.203
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 526-842
Mfr. Part No.UC3843AN
$2.974
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 121-8957
Mfr. Part No.UC3846N
$6.73
Each (In a Tube of 25)
units
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS Stock No. 796-8470
Mfr. Part No.UC1844J
$38.35
Each
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 462-7249
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
$5.714
Each (In a Pack of 5)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 162-6059
Mfr. Part No.UC3861N
$7.296
Each (In a Tube of 100)
units
550 kHz - - - - - 500 mA - Voltage 2 25ns Through Hole PDIP 25ns
RS Stock No. 689-9950
Mfr. Part No.SG3525ANG
$1.875
Each (In a Pack of 2)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 103-5077
Mfr. Part No.SG3525ANG
$1.602
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 660-8076
Mfr. Part No.UC3842AN
$3.37
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-1004
Mfr. Part No.SG3525AP
$2.965
Each (In a Pack of 2)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 168-6816
Mfr. Part No.SG3525AP
$2.257
Each (In a Tube of 50)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns