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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Omschrijving Prijs 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
RS-stocknr. 145-6183
FabrikantnummerUC2524AN
1,706 €
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- - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
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500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS-stocknr. 200-6779
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RS-stocknr. 923-3842
FabrikantnummerUC3844N
1,302 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 922-3445
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2,656 €
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- - - - - - - - - - - - - -
RS-stocknr. 179-1760
FabrikantnummerUCC3804D
2,604 €
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1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS-stocknr. 661-5232
FabrikantnummerUC3526ADW
3,166 €
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650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS-stocknr. 661-4970
FabrikantnummerTL598CD
1,788 €
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300 kHz - - - - - 200 mA - Voltage 2 35ns Surface Mount SOIC 60ns
RS-stocknr. 661-5787
FabrikantnummerUCC35701D
8,40 €
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700 kHz - - - - - 1 A - Voltage 1 20ns Surface Mount SOIC 20ns
RS-stocknr. 145-0126
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1,519 €
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300 kHz - - - - - 200 mA - Voltage 2 35ns Surface Mount SOIC 60ns
RS-stocknr. 660-8082
FabrikantnummerUC3844N
1,532 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 661-5838
FabrikantnummerUCC3804D
3,08 €
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1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS-stocknr. 620-0593
FabrikantnummerUC3846N
4,608 €
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500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS-stocknr. 517-2986
FabrikantnummerTL494IN
0,72 €
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7,217 €
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700 kHz - - - - - 1 A - Voltage 1 20ns Surface Mount SOIC 20ns
RS-stocknr. 661-5734
FabrikantnummerUCC2889N
1,188 €
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250 kHz - - - - 18 V - - Voltage 1 30ns Through Hole PDIP 35ns
RS-stocknr. 121-8957
FabrikantnummerUC3846N
3,919 €
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Aantal stuks
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns