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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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 686-5033
Référence fabricantUC3842BN
0,496 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 919-6478
Référence fabricantUC3842BN
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 102-3497
Référence fabricantUC3842BNG
0,414 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 516-5146
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 857-8510
Référence fabricantICE3B0365JFKLA1
MarqueInfineon
0,834 €
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76 kHz - - - - - - - Current 1 30ns Through Hole PDIP 30ns
N° de stock RS 145-6183
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1,706 €
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- - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
N° de stock RS 145-2968
Référence fabricantMC34067PG
1,956 €
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2200 kHz - - - - 5.2 V 1.5 A - Voltage 2 50ns Through Hole PDIP 50ns
N° de stock RS 880-5364
Référence fabricantSG3525AN
1,167 €
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400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
N° de stock RS 168-8921
Référence fabricantSG3525AN
1,166 €
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400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
N° de stock RS 806-2107
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2,354 €
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2200 kHz - - - - 5.2 V 1.5 A - Voltage 2 50ns Through Hole PDIP 50ns
N° de stock RS 862-9384
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600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
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500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
N° de stock RS 796-8473
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16,46 €
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500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
N° de stock RS 145-4653
Référence fabricantKA7553A
0,214 €
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600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
N° de stock RS 162-4341
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1,457 €
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500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
N° de stock RS 179-2108
Référence fabricantUCC35701D
6,245 €
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700 kHz - - - - - 1 A - Voltage 1 20ns Surface Mount SOIC 20ns
N° de stock RS 620-0593
Référence fabricantUC3846N
3,886 €
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500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
N° de stock RS 923-3842
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1,084 €
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
N° de stock RS 739-6074
Référence fabricantFAN6300HMY
0,778 €
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190 kHz - - - - 7.5 V - - Current - 120ns Surface Mount SOP 200ns
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