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 620-0593
Référence fabricantUC3846N
4,008 €
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500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
N° de stock RS 920-3479
Référence fabricantTL494IN
0,515 €
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300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
N° de stock RS 633-789
Référence fabricantSG3524N
1,38 €
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300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
N° de stock RS 920-8878
Référence fabricantVIPER22AS-E
0,627 €
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60 kHz - - - - 730 V - - Current - 100ns Surface Mount SOIC 50ns
N° de stock RS 714-1004
Référence fabricantSG3525AP
1,425 €
Each (In a Pack of 2)
Unité
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
N° de stock RS 145-0126
Référence fabricantTL598CD
1,32 €
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300 kHz - - - - - 200 mA - Voltage 2 35ns Surface Mount SOIC 60ns
N° de stock RS 415-1045
Référence fabricantL6598D
1,98 €
Each
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400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
N° de stock RS 168-6083
Référence fabricantL6598D
1,675 €
Each (In a Tube of 50)
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400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
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)
Unité
190 kHz - - - - 7.5 V - - Current - 120ns Surface Mount SOP 200ns
N° de stock RS 661-5734
Référence fabricantUCC2889N
1,188 €
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250 kHz - - - - 18 V - - Voltage 1 30ns Through Hole PDIP 35ns
N° de stock RS 145-4322
Référence fabricantKA3525A
0,603 €
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430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
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 426-253
Référence fabricantVIPER22AS-E
1,078 €
Each (In a Pack of 5)
Unité
60 kHz - - - - 730 V - - Current - 100ns Surface Mount SOIC 50ns
N° de stock RS 739-0284
Référence fabricantKA3525A
0,728 €
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Unité
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
N° de stock RS 179-2108
Référence fabricantUCC35701D
6,245 €
Each (In a Tube of 50)
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700 kHz - - - - - 1 A - Voltage 1 20ns Surface Mount SOIC 20ns
N° de stock RS 661-5787
Référence fabricantUCC35701D
7,30 €
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700 kHz - - - - - 1 A - Voltage 1 20ns Surface Mount SOIC 20ns
N° de stock RS 179-1760
Référence fabricantUCC3804D
2,264 €
Each (In a Tube of 75)
Unité
1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
N° de stock RS 168-6816
Référence fabricantSG3525AP
1,211 €
Each (In a Tube of 50)
Unité
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
N° de stock RS 922-3445
Référence fabricantUC3526ADW
2,297 €
Each (In a Tube of 40)
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