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 Prix 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
N° de stock RS 828-7432
Référence fabricantAP3105KTR-G1
MarqueDiodesZetex
0,338 €
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70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
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 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 163-2463
Référence fabricantMC33067PG
1,898 €
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- - - - - - - - - - - - - -
N° de stock RS 168-6471
Référence fabricantL6598
1,721 €
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400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Through Hole PDIP -
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 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 166-1621
Référence fabricantFAN6300AMY
0,305 €
Each (On a Reel of 2500)
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190 kHz - - - - 4.5 V 150 mA - Current 1 120ns Surface Mount SOP 200ns
N° de stock RS 686-8433
Référence fabricantL6598
2,035 €
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400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Through Hole PDIP -
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 516-5691
Référence fabricantMC33067PG
2,24 €
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- - - - - - - - - - - Through Hole PDIP -
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 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 526-842
Référence fabricantUC3843AN
1,358 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 661-5131
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2,12 €
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500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
N° de stock RS 145-2943
Référence fabricantUC3844BVDG
0,517 €
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275 kHz - - - - 4.9 to 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
N° de stock RS 178-9135
Référence fabricantSG3524D
0,825 €
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450 kHz - - - - - 100 mA - - - - Surface Mount SOIC -
N° de stock RS 178-4280
Référence fabricantFAN65008B
1,417 €
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1 MHz - - - - 5.25 V 10 A - Voltage 1 200ns Surface Mount PQFN 200ns
N° de stock RS 686-5755
Référence fabricantSP6137EU-L/TR
MarqueMaxLinear
1,154 €
Each (In a Pack of 5)
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900 kHz - - - - 10 V 2 A - Voltage 1 30ns Surface Mount MSOP 35ns
N° de stock RS 197-7625
Référence fabricantUC3844AN
1,143 €
Each (In a Tube of 50)
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500 KHz - - - - - ±1 A - - 1 50ns - PDIP 50ns