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 821-5168
Référence fabricantNCP1236BD65R2G
0,605 €
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70 kHz - - - - - - - Current 1 70ns Surface Mount SOIC 70ns
N° de stock RS 162-6036
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12,616 €
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1000 kHz - - - - - 2 A - Current, Voltage 2 20ns Surface Mount SOIC 20ns
N° de stock RS 786-8853
Référence fabricantNCP1230D65R2G
0,904 €
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72 kHz - - - - 18 V -800 mA, 500 mA - Current 1 15ns Surface Mount SOIC 40ns
N° de stock RS 660-8108
Référence fabricantUCC3808N-2
3,46 €
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1000 kHz - - - - - 1 A - Current 2 25ns Through Hole PDIP 25ns
N° de stock RS 145-2939
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0,612 €
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275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
N° de stock RS 162-6037
Référence fabricantUC3823AN
14,069 €
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1000 kHz - - - - - 2 A - Current, Voltage 2 20ns Through Hole PDIP 20ns
N° de stock RS 178-4495
Référence fabricantFAN65005A
3,374 €
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1 MHz - - - - 5.25 V 8 A - Voltage 1 200ns Surface Mount PQFN 200ns
N° de stock RS 122-0122
Référence fabricantNCP1236BD100R2G
0,50 €
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32 kHz - - - - 28 V 500 mA - Current 1 70ns Surface Mount SOIC 70ns
N° de stock RS 620-0622
Référence fabricantUCC3802D
2,672 €
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1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
N° de stock RS 168-4857
Référence fabricantSG2524DR
0,349 €
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450 kHz - - - - - 100 mA - - - - Surface Mount SOIC -
N° de stock RS 162-9491
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0,139 €
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71 kHz - - - - 28.3 V -500 mA, 300 mA - Current 1 30ns Surface Mount TSOP 40ns
N° de stock RS 917-3491
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2,634 €
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1800 kHz - - - - -5 V - - - - - Surface Mount TSOT-23 -
N° de stock RS 661-5572
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3,21 €
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1000 kHz - - - - - 1 A - Current 2 25ns Surface Mount SOIC 25ns
N° de stock RS 162-4865
Référence fabricantTL5001ACD
0,867 €
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- - - - - 1 to 50 V 3 A - - 1 - Surface Mount SOIC -
N° de stock RS 661-5364
Référence fabricantUC3845D
1,188 €
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
N° de stock RS 145-2952
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0,346 €
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275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
N° de stock RS 170-3057
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1,71 €
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1.75 MHz - - - - 0.8 to 17 V 1.2 A - - 1 - Surface Mount TSOT -
N° de stock RS 786-6497
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1,61 €
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1.11 MHz - - - - -0.3 to 10 V - - Voltage 1 20ns Surface Mount SOIC 20ns
N° de stock RS 162-6059
Référence fabricantUC3861N
3,817 €
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550 kHz - - - - - 500 mA - Voltage 2 25ns Through Hole PDIP 25ns
N° de stock RS 805-4572
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