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 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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Beskrivning Pris 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-artikelnummer 121-8951
Tillv. art.nrUC3524AN
VarumärkeTexas Instruments
26,204 kr
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500 kHz - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS-artikelnummer 620-0492
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VarumärkeTexas Instruments
30,67 kr
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RS-artikelnummer 121-9153
Tillv. art.nrUC2879N
VarumärkeTexas Instruments
129,547 kr
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300 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
RS-artikelnummer 661-5201
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140,98 kr
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RS-artikelnummer 168-8921
Tillv. art.nrSG3525AN
VarumärkeSTMicroelectronics
20,39 kr
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400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS-artikelnummer 145-0807
Tillv. art.nrUC2842AN
VarumärkeTexas Instruments
11,318 kr
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-artikelnummer 168-5810
Tillv. art.nrVIPER12AS-E
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13,312 kr
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- - - - - - - - - - - Surface Mount SOIC -
RS-artikelnummer 919-8812
Tillv. art.nrICE3BR0665JXKLA1
VarumärkeInfineon
30,173 kr
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65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS-artikelnummer 880-5364
Tillv. art.nrSG3525AN
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21,701 kr
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RS-artikelnummer 753-2964
Tillv. art.nrICE3BR0665JXKLA1
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35,61 kr
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65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS-artikelnummer 145-4322
Tillv. art.nrKA3525A
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13,752 kr
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430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS-artikelnummer 739-0284
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15,612 kr
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RS-artikelnummer 426-247
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18,726 kr
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RS-artikelnummer 761-8342
Tillv. art.nrLT1619ES8#PBF
VarumärkeAnalog Devices
55,12 kr
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360 kHz - - - - - 1.5 A - Current 1 35ns Surface Mount SOIC 30ns
RS-artikelnummer 103-5077
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12,35 kr
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400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS-artikelnummer 168-6829
Tillv. art.nrUC2845BN
VarumärkeSTMicroelectronics
12,394 kr
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-artikelnummer 689-9950
Tillv. art.nrSG3525ANG
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14,78 kr
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400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS-artikelnummer 436-3305
Tillv. art.nrUC3825N
VarumärkeTexas Instruments
79,02 kr
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1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Through Hole PDIP 30ns
RS-artikelnummer 714-1149
Tillv. art.nrUC2845BN
VarumärkeSTMicroelectronics
12,701 kr
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-artikelnummer 145-4652
Tillv. art.nrKA7552A
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9,70 kr
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600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -