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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Beskrivning Pris 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-artikelnummer 620-0492
Tillv. art.nrUC3524AN
VarumärkeTexas Instruments
22,202 kr
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500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS-artikelnummer 121-8951
Tillv. art.nrUC3524AN
VarumärkeTexas Instruments
18,956 kr
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500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS-artikelnummer 121-9153
Tillv. art.nrUC2879N
VarumärkeTexas Instruments
95,502 kr
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300 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
RS-artikelnummer 661-5201
Tillv. art.nrUC2879N
VarumärkeTexas Instruments
72,41 kr
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300 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
RS-artikelnummer 661-4942
Tillv. art.nrTL3843P
VarumärkeTexas Instruments
3,432 kr
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500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
RS-artikelnummer 145-0807
Tillv. art.nrUC2842AN
VarumärkeTexas Instruments
11,318 kr
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-artikelnummer 121-8541
Tillv. art.nrUC3825N
VarumärkeTexas Instruments
42,259 kr
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- - - - - - - - - - - - - -
RS-artikelnummer 436-3305
Tillv. art.nrUC3825N
VarumärkeTexas Instruments
49,80 kr
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1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Through Hole PDIP 30ns
RS-artikelnummer 661-4949
Tillv. art.nrTL3845P
VarumärkeTexas Instruments
3,708 kr
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500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
RS-artikelnummer 620-0600
Tillv. art.nrUCC3801D
VarumärkeTexas Instruments
28,494 kr
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1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS-artikelnummer 162-4341
Tillv. art.nrTL5001CP
VarumärkeTexas Instruments
14,703 kr
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500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
RS-artikelnummer 628-2804
Tillv. art.nrUCC28C44D
VarumärkeTexas Instruments
16,338 kr
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1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS-artikelnummer 162-6749
Tillv. art.nrTL494CNSR
VarumärkeTexas Instruments
2,106 kr
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RS-artikelnummer 145-0124
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VarumärkeTexas Instruments
3,294 kr
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500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
RS-artikelnummer 145-7322
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VarumärkeTexas Instruments
13,843 kr
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1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS-artikelnummer 200-6779
Tillv. art.nrTL5001CP
VarumärkeTexas Instruments
18,66 kr
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500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
RS-artikelnummer 809-5393
Tillv. art.nrTL494CNSR
VarumärkeTexas Instruments
5,418 kr
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300 kHz 9 to 15mA 200mA 200mA 3.5 mA - - Yes - - - Surface Mount SOIC -
RS-artikelnummer 620-0587
Tillv. art.nrUCC3800D
VarumärkeTexas Instruments
28,494 kr
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1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS-artikelnummer 145-7554
Tillv. art.nrUCC38501DW
VarumärkeTexas Instruments
46,861 kr
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115 kHz 0.15mA - - - - - - - - - Surface Mount SOIC -
RS-artikelnummer 162-6037
Tillv. art.nrUC3823AN
VarumärkeTexas Instruments
150,034 kr
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1000 kHz - - - - - 2 A - Current, Voltage 2 20ns Through Hole PDIP 20ns