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 686-5033
Référence fabricantUC3842BN
0,544 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 919-6478
Référence fabricantUC3842BN
0,543 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 857-8510
Référence fabricantICE3B0365JFKLA1
MarqueInfineon
0,834 €
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76 kHz - - - - - - - Current 1 30ns Through Hole PDIP 30ns
N° de stock RS 102-3497
Référence fabricantUC3842BNG
0,436 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 516-5146
Référence fabricantUC3842BNG
0,52 €
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Unité
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 145-6183
Référence fabricantUC2524AN
1,706 €
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- - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
N° de stock RS 880-5364
Référence fabricantSG3525AN
1,10 €
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400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
N° de stock RS 806-2107
Référence fabricantMC34067PG
2,354 €
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2200 kHz - - - - 5.2 V 1.5 A - Voltage 2 50ns Through Hole PDIP 50ns
N° de stock RS 145-2968
Référence fabricantMC34067PG
1,998 €
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2200 kHz - - - - 5.2 V 1.5 A - Voltage 2 50ns Through Hole PDIP 50ns
N° de stock RS 168-8921
Référence fabricantSG3525AN
1,101 €
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400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
N° de stock RS 162-4341
Référence fabricantTL5001CP
1,457 €
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500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
N° de stock RS 862-9384
Référence fabricantKA7553A
0,275 €
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600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
N° de stock RS 796-8473
Référence fabricantUC1845AJ
16,46 €
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500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
N° de stock RS 200-6779
Référence fabricantTL5001CP
1,75 €
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Unité
500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
N° de stock RS 145-4653
Référence fabricantKA7553A
0,27 €
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600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
N° de stock RS 168-6083
Référence fabricantL6598D
1,675 €
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400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
N° de stock RS 426-253
Référence fabricantVIPER22AS-E
1,078 €
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60 kHz - - - - 730 V - - Current - 100ns Surface Mount SOIC 50ns
N° de stock RS 661-4970
Référence fabricantTL598CD
1,554 €
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300 kHz - - - - - 200 mA - Voltage 2 35ns Surface Mount SOIC 60ns
N° de stock RS 145-8579
Référence fabricantSG3524N
1,178 €
Each (In a Tube of 25)
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300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
N° de stock RS 166-2461
Référence fabricantFAN6300HMY
0,31 €
Each (On a Reel of 2500)
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190 kHz - - - - 7.5 V - - Current - 120ns Surface Mount SOP 200ns