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 Price 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 Stock No. 193-1547
Mfr. Part No.RAA2124214GNP#MA0
HK$19.828
Each (On a Reel of 250)
units
2 MHz, 500 kHz - - - - 0.8 to 5.5 V 1.1 A - - 2 - Surface Mount TDFN -
RS Stock No. 180-8393
Mfr. Part No.ISL81401AFRZ-T7A
HK$49.09
Each
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -
RS Stock No. 193-1525
Mfr. Part No.ISL854102FRZ-T7A
HK$17.273
Each (On a Reel of 250)
units
2 MHz, 500 kHz - - - - - 1.2 A - - 2 - Surface Mount DFN -
RS Stock No. 180-8390
Mfr. Part No.ISL81401AFRZ-T7A
HK$30.673
Each (On a Reel of 250)
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -
RS Stock No. 180-8391
Mfr. Part No.ISL81401FRZ-T7A
HK$30.673
Each (On a Reel of 250)
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -
RS Stock No. 193-1548
Mfr. Part No.RAA2124214GNP#MA0
HK$31.734
Each (In a Pack of 5)
units
2 MHz, 500 kHz - - - - 0.8 to 5.5 V 1.1 A - - 2 - Surface Mount TDFN -
RS Stock No. 180-8396
Mfr. Part No.ISL81401FRZ-T7A
HK$49.09
Each
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -
RS Stock No. 180-8398
Mfr. Part No.ISL81601FRZ-T7A
HK$78.89
Each
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -
RS Stock No. 193-1526
Mfr. Part No.ISL854102FRZ-T7A
HK$27.058
Each (In a Pack of 5)
units
2 MHz, 500 kHz - - - - - 1.2 A - - 2 - Surface Mount DFN -
RS Stock No. 577-058
Mfr. Part No.HA16108FP-E
HK$16.10
Each
units
- - - - - - - - - - - Surface Mount SOP -
RS Stock No. 180-8392
Mfr. Part No.ISL81601FRZ-T7A
HK$52.355
Each (On a Reel of 250)
units
650 kHz 2µA 1mA 1mA 6 mA - - - - 1 - Surface Mount QFN -