PWM

PWM stands for Pulse Width Modulation. Electronic circuits can contain both analogue and digital components. PWM allows you to control analogue devices using a digital signal. Many electrical designs use PWM for regulation.

Analogue signals can be on or off, but they can also be half-way on etc. Whereas a digital signal has just on or off positions. Both signals appear in electronic circuits and are required to work together. Inputs can be converted using a DAC or ADC. PWM is available to control the output of a device. For example, a PWM can convert the digital output of a microcontroller (MCU) into an analogue signal, to drive the next analogue component.

Types of PWM device:

  • 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 duty cycle?

PWM signals feature two main things, frequency and a duty cycle. Duty cycle is given as a % 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 is PWM 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. 162-9496
FabrikantnummerNCP1271D65R2G
FabrikantON Semiconductor
€ 0,276
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Aantal stuks
69 kHz - - - - 20 V 500 mA, -800 mA - Current 1 20ns Surface Mount SOIC 30ns
RS-stocknr. 786-8890
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FabrikantON Semiconductor
€ 0,592
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69 kHz - - - - 20 V 500 mA, -800 mA - Current 1 20ns Surface Mount SOIC 30ns
RS-stocknr. 166-2844
FabrikantnummerFAN7601BMX
FabrikantON Semiconductor
€ 0,307
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300 kHz - - - - 2.5 V 250 mA - Current 1 150ns Surface Mount SOP 150ns
RS-stocknr. 516-5691
FabrikantnummerMC33067PG
FabrikantON Semiconductor
€ 2,24
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- - - - - - - - - - - Through Hole PDIP -
RS-stocknr. 178-4732
FabrikantnummerUC3844BNG
FabrikantON Semiconductor
€ 0,414
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 516-5168
FabrikantnummerUC3844BNG
FabrikantON Semiconductor
€ 0,49
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 163-2463
FabrikantnummerMC33067PG
FabrikantON Semiconductor
€ 1,858
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Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 786-6670
FabrikantnummerUC3845BD1R2G
FabrikantON Semiconductor
€ 0,385
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Aantal stuks
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS-stocknr. 162-9679
FabrikantnummerUC3845BD1R2G
FabrikantON Semiconductor
€ 0,163
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Aantal stuks
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS-stocknr. 772-8878
FabrikantnummerFAN7601BMX
FabrikantON Semiconductor
€ 0,514
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300 kHz - - - - 2.5 V 250 mA - Current 1 150ns Surface Mount SOP 150ns
RS-stocknr. 689-9966
FabrikantnummerUC3845BD1G
FabrikantON Semiconductor
€ 0,485
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 170-3427
FabrikantnummerUC3845BD1G
FabrikantON Semiconductor
€ 0,377
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500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 786-6624
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FabrikantON Semiconductor
€ 0,132
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250 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS-stocknr. 688-8831
FabrikantnummerNCP1014ST65T3G
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€ 0,865
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71 kHz - - - - - - - Current 1 - Surface Mount SOT-223 20ns
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€ 0,766
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130 kHz - - - - 20 V 500 mA - Current 1 20ns Through Hole PDIP 50ns
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FabrikantON Semiconductor
€ 0,725
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32 kHz - - - - 28 V 500 mA - Current 1 70ns Surface Mount SOIC 70ns
RS-stocknr. 786-8907
FabrikantnummerNCP1337PG
FabrikantON Semiconductor
€ 0,954
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130 kHz - - - - 20 V 500 mA - Current 1 20ns Through Hole PDIP 50ns
RS-stocknr. 103-5063
FabrikantnummerNCP1014ST65T3G
FabrikantON Semiconductor
€ 0,365
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Aantal stuks
71 kHz - - - - - - - Current 1 - Surface Mount SOT-223 20ns
RS-stocknr. 162-8992
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FabrikantON Semiconductor
€ 0,72
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Aantal stuks
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS-stocknr. 162-9490
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FabrikantON Semiconductor
€ 0,139
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Aantal stuks
71 kHz - - - - 28.3 V 300 mA, -500 mA - Current 1 30ns Surface Mount TSOP 40ns