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. 661-5421
Mfr. Part No.UC3861N
$10.62
Each
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. 122-0079
Mfr. Part No.NCP1014AP100G
$1.534
Each (In a Tube of 50)
units
110 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 796-8477
Mfr. Part No.UC1845J
$44.04
Each
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 769-5649
Mfr. Part No.XRP6124HVES0.5-F
BrandMaxLinear
$1.664
Each (In a Pack of 5)
units
1000 kHz - - - - 1.2 → 12 V 4 A - Voltage 1 35ns Surface Mount SOT-23 45ns
RS Stock No. 880-5364
Mfr. Part No.SG3525AN
$2.559
Each (In a Pack of 10)
units
400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 178-5493
Mfr. Part No.UC1845J
$40.868
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 920-3479
Mfr. Part No.TL494IN
$1.197
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 463-464
Mfr. Part No.UC3844BD1G
$1.103
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 464-316
Mfr. Part No.NCP1014AP100G
$1.836
Each (In a Pack of 5)
units
110 kHz - - - - - - - Current 1 - Through Hole PDIP 20ns
RS Stock No. 145-4652
Mfr. Part No.KA7552A
$1.297
Each (In a Tube of 50)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 709-2554
Mfr. Part No.TL3844PE4
$1.692
Each (In a Pack of 5)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 170-4519
Mfr. Part No.XRP6124HVES0.5-F
BrandMaxLinear
$1.30
Each (In a Bag of 200)
units
1000 kHz - - - - 1.2 to 12 V 4 A - Voltage 1 35ns Surface Mount SOT-23 45ns
RS Stock No. 168-4089
Mfr. Part No.TL3844PE4
$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. 517-2986
Mfr. Part No.TL494IN
$1.414
Each (In a Pack of 5)
units
300 kHz - - - - - 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 633-789
Mfr. Part No.SG3524N
$3.11
Each
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 168-8921
Mfr. Part No.SG3525AN
$2.401
Each (In a Tube of 25)
units
400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 862-9375
Mfr. Part No.KA7552A
$1.376
Each (In a Pack of 10)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 145-8579
Mfr. Part No.SG3524N
$2.21
Each (In a Tube of 25)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 170-3359
Mfr. Part No.UC3844BD1G
$1.036
Each (In a Tube of 98)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns