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. 184-8244
Mfr. Part No.BA17807CP-E2
BrandROHM
MYR6.40
Each (In a Pack of 5)
units
- - - - - 7 V 1 A - - - - Through Hole TO-220CP -
RS Stock No. 526-947
Mfr. Part No.SG2524DR
MYR3.223
Each (In a Pack of 10)
units
450 kHz - - - - - 100 (Max) mA - - - - Surface Mount SOIC -
RS Stock No. 162-6269
Mfr. Part No.LM5020SD-1/NOPB
MYR5.957
Each (On a Reel of 1000)
units
1000 kHz - - - - - 1 A - Current 1 15ns Surface Mount LLP 18ns
RS Stock No. 166-3260
Mfr. Part No.FAN6224M
MYR1.754
Each (On a Reel of 2500)
units
140 kHz - - - - 14 V - - - 1 - Surface Mount SOP -
RS Stock No. 145-5766
Mfr. Part No.UCC2889N
MYR10.96
Each (In a Tube of 50)
units
250 kHz - - - - 18 V - - Voltage 1 30ns Through Hole PDIP 35ns
RS Stock No. 761-5252
Mfr. Part No.LM5033SD/NOPB
MYR9.00
Each (On a Tape of 5)
units
1000 kHz - - - - 9.75 V 1.5 A - Voltage 2 16ns Surface Mount LLP 16ns
RS Stock No. 185-9316
Mfr. Part No.NCV1063AD100R2G
MYR6.64
Each (In a Pack of 6)
units
100 kHz - - - - 670 V 780 mA - - - 10ns Surface Mount SOIC 20ns