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 165-9320
Référence fabricantMAX1951ESA+
2,513 €
Each (In a Tube of 100)
Unité
1100 kHz - - - - 5.5 V 2 A - - 1 - Surface Mount SOIC -
N° de stock RS 190-0386
Référence fabricantMAX1640EEE+
4,295 €
Each (In a Pack of 2)
Unité
500 kHz - - - - 24 V - - Current 1 - Surface Mount QSOP -
N° de stock RS 189-7701
Référence fabricantMAX668EUB+T
2,404 €
Each (On a Reel of 2500)
Unité
500 kHz - - - - 28 V 1 A - Current 1 - Surface Mount μSOP -
N° de stock RS 190-6679
Référence fabricantMAX8521ETP+T
9,57 €
Each
Unité
1 MHz - - - 21 mA - - - - - - Surface Mount TQFN -
N° de stock RS 190-4416
Référence fabricantMAX8521ETP+T
7,408 €
Each (On a Reel of 2500)
Unité
1 MHz - - - 21 mA - - - - 1 - Surface Mount TQFN -
N° de stock RS 190-0192
Référence fabricantMAX1847EEE+
4,63 €
Each (In a Pack of 2)
Unité
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns
N° de stock RS 923-7141
Référence fabricantMAX1847EEE+
3,273 €
Each (In a Tube of 100)
Unité
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns
N° de stock RS 190-1363
Référence fabricantMAX668EUB+
3,675 €
Each (In a Pack of 2)
Unité
500 kHz - - - - 28 V 1 A - Current 1 - Surface Mount μSOP -
N° de stock RS 732-8853
Référence fabricantMAX1951ESA+
3,61 €
Each
Unité
1100 kHz - - - - 5.5 V 2 A - - 1 - Surface Mount SOIC -
N° de stock RS 732-8838
Référence fabricantMAX1847EEE+
4,67 €
Each
Unité
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns
N° de stock RS 189-7752
Référence fabricantMAX6615AEE+
2,252 €
Each (In a Tube of 100)
Unité
- - - - - - - - - - - Surface Mount QSOP -
N° de stock RS 189-6954
Référence fabricantMAX1847EEE+
3,442 €
Each (In a Tube of 100)
Unité
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns
N° de stock RS 189-6925
Référence fabricantMAX1640EEE+
3,068 €
Each (In a Tube of 100)
Unité
500 kHz - - - - 24 V - - Current 1 - Surface Mount QSOP -
N° de stock RS 190-1402
Référence fabricantMAX668EUB+T
3,945 €
Each (In a Pack of 2)
Unité
500 kHz - - - - 5.5 V 20 mA - Current 1 200ns Surface Mount μMAX 200ns
N° de stock RS 190-1345
Référence fabricantMAX6615AEE+
3,076 €
Each (In a Pack of 5)
Unité
- - - - - - - - - - - Surface Mount QSOP -