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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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. 190-1363
Mfr. Part No.MAX668EUB+
SGD6.935
Each (In a Pack of 2)
units
500 kHz - - - - 28 V 1 A - Current 1 - Surface Mount μSOP -
RS Stock No. 732-8853
Mfr. Part No.MAX1951ESA+
SGD6.01
Each
units
1100 kHz - - - - 5.5 V 2 A - - 1 - Surface Mount SOIC -
RS Stock No. 190-1345
Mfr. Part No.MAX6615AEE+
SGD5.672
Each (In a Pack of 5)
units
- - - - - - - - - - - Surface Mount QSOP -
RS Stock No. 165-9320
Mfr. Part No.MAX1951ESA+
SGD4.561
Each (In a Tube of 100)
units
1100 kHz - - - - 5.5 V 2 A - - 1 - Surface Mount SOIC -
RS Stock No. 190-0386
Mfr. Part No.MAX1640EEE+
SGD7.755
Each (In a Pack of 2)
units
500 kHz - - - - 24 V - - Current 1 - Surface Mount QSOP -
RS Stock No. 190-1402
Mfr. Part No.MAX668EUB+T
SGD7.235
Each (In a Pack of 2)
units
500 kHz - - - - 5.5 V 20 mA - Current 1 200ns Surface Mount μMAX 200ns
RS Stock No. 190-4416
Mfr. Part No.MAX8521ETP+T
SGD13.444
Each (On a Reel of 2500)
units
1 MHz - - - 21 mA - - - - 1 - Surface Mount TQFN -
RS Stock No. 189-7701
Mfr. Part No.MAX668EUB+T
SGD4.673
Each (On a Reel of 2500)
units
500 kHz - - - - 28 V 1 A - Current 1 - Surface Mount μSOP -
RS Stock No. 189-7752
Mfr. Part No.MAX6615AEE+
SGD4.208
Each (In a Tube of 100)
units
- - - - - - - - - - - Surface Mount QSOP -
RS Stock No. 923-7141
Mfr. Part No.MAX1847EEE+
SGD7.487
Each (In a Tube of 100)
units
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns
RS Stock No. 190-6679
Mfr. Part No.MAX8521ETP+T
SGD16.88
Each
units
1 MHz - - - 21 mA - - - - - - Surface Mount TQFN -
RS Stock No. 190-0192
Mfr. Part No.MAX1847EEE+
SGD8.605
Each (In a Pack of 2)
units
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns
RS Stock No. 732-8838
Mfr. Part No.MAX1847EEE+
SGD7.90
Each
units
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns
RS Stock No. 189-6925
Mfr. Part No.MAX1640EEE+
SGD7.198
Each (In a Tube of 100)
units
500 kHz - - - - 24 V - - Current 1 - Surface Mount QSOP -
RS Stock No. 189-6954
Mfr. Part No.MAX1847EEE+
SGD7.263
Each (In a Tube of 100)
units
500 kHz - - - - -200 V 5 A - Current 1 200ns Surface Mount QSOP 200ns