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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N° de stock RS 769-5649
Référence fabricantXRP6124HVES0.5-F
MarqueMaxLinear
0,44 €
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1000 kHz - - - - 1.2 to 12 V 4 A - Voltage 1 35ns Surface Mount SOT-23 45ns
N° de stock RS 411-857
Référence fabricantLTC1871EMS#PBF
5,52 €
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1000 kHz - - - - 7 V 50 mA - Current 1 100ns Surface Mount MSOP 100ns
N° de stock RS 796-8451
Référence fabricantUC1524AJ
10,21 €
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500 kHz - - - - 5.1 V 200 mA - Voltage 2 200ns Through Hole CDIP 400ns
N° de stock RS 526-874
Référence fabricantUC2843AN
1,354 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 516-5691
Référence fabricantMC33067PG
2,24 €
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- - - - - - - - - - - Through Hole PDIP -
N° de stock RS 733-6416
Référence fabricantXRP7664IDTR-F
MarqueMaxLinear
0,828 €
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340 kHz - - - - 16 V 2 A - - 1 - Surface Mount SOIC -
N° de stock RS 800-7425
Référence fabricantFAN6300AMY
0,539 €
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190 kHz - - - - 4.5 V 150 mA - Current 1 120ns Surface Mount SOP 200ns
N° de stock RS 121-8412
Référence fabricantUC2843AN
1,154 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 166-1621
Référence fabricantFAN6300AMY
0,305 €
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190 kHz - - - - 4.5 V 150 mA - Current 1 120ns Surface Mount SOP 200ns
N° de stock RS 170-8908
Référence fabricantAP3105KTR-G1
MarqueDiodesZetex
0,22 €
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70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
N° de stock RS 862-9375
Référence fabricantKA7552A
0,634 €
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600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
N° de stock RS 779-9347
Référence fabricantLT1533CS#PBF
9,19 €
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250 kHz - - - - 30 V 1 A - - 1 - Surface Mount SOIC -
N° de stock RS 145-6557
Référence fabricantUC2844D
1,152 €
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
N° de stock RS 145-4652
Référence fabricantKA7552A
0,634 €
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600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
N° de stock RS 628-2860
Référence fabricantUCC28C45D
1,522 €
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1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
N° de stock RS 165-8404
Référence fabricantAP3125AKTR-G1
MarqueDiodesZetex
0,229 €
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70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-26 250ns
N° de stock RS 121-8975
Référence fabricantUCC28C45D
1,298 €
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1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
N° de stock RS 163-2223
Référence fabricantNCP1937B1DR2G
0,508 €
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30.5 kHz 20mA 290µA 48µA 5.2 mA - - - - 1 - Surface Mount SOIC -
N° de stock RS 828-7432
Référence fabricantAP3105KTR-G1
MarqueDiodesZetex
0,338 €
Each (In a Pack of 25)
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70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
N° de stock RS 168-6471
Référence fabricantL6598
1,721 €
Each (In a Tube of 25)
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400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Through Hole PDIP -