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 121-9153
Référence fabricantUC2879N
8,898 €
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Unité
300 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
N° de stock RS 175-1177
Référence fabricantEVALKITSTKNX
165,49 €
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16 MHz - - - - - - - - - - - - -
N° de stock RS 913-4357
Référence fabricantXRP7665IDBTR-F
MarqueMaxLinear
0,411 €
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400 kHz - - - - 0.925 to 16 V 3 A - - 1 - Surface Mount SOIC -
N° de stock RS 184-1121
Référence fabricantUC2843BDG
0,179 €
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500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
N° de stock RS 660-8079
Référence fabricantUC3842N
1,332 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 162-7708
Référence fabricantLM5046MH/NOPB
4,514 €
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540 kHz 80mA 1.5A 2A 4.6 mA - - Yes - - - Surface Mount HTSSOP -
N° de stock RS 168-4860
Référence fabricantUCC2808D-1
1,916 €
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1 MHz - - - - - 1 A - - - - Surface Mount SOIC -
N° de stock RS 689-9966
Référence fabricantUC3845BD1G
0,485 €
Each (In a Pack of 2)
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
N° de stock RS 184-1120
Référence fabricantUC2842BNG
0,414 €
Each (In a Tube of 50)
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500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole PDIP 150ns
N° de stock RS 175-1176
Référence fabricantSTCH03TR
0,534 €
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196 kHz 0.9mA - - 2.9 mA 13 V - Yes - 1 - Surface Mount SO8 -
N° de stock RS 145-6558
Référence fabricantUCC3808D-2
2,674 €
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1000 kHz - - - - - 1 A - Current 2 25ns Surface Mount SOIC 25ns