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. 828-7432
Mfr. Part No.AP3105KTR-G1
HK$2.307
Each (In a Pack of 25)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
RS Stock No. 165-8404
Mfr. Part No.AP3125AKTR-G1
HK$2.426
Each (On a Reel of 3000)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-26 250ns
RS Stock No. 169-7168
Mfr. Part No.AP6503ASP-13
HK$4.463
Each (On a Reel of 2500)
units
260 kHz - - - - 0.925 to 20 V 3 A - Current 1 - Surface Mount SOIC 130ns
RS Stock No. 170-8910
Mfr. Part No.AP3105NAKTR-G1
HK$1.755
Each (On a Reel of 3000)
units
70 kHz 20µA 110µA - 2 mA - - - - - - Surface Mount SOT-23 -
RS Stock No. 170-8908
Mfr. Part No.AP3105KTR-G1
HK$1.77
Each (On a Reel of 3000)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
RS Stock No. 921-0515
Mfr. Part No.AP3125AKTR-G1
HK$5.576
Each (In a Pack of 20)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-26 250ns
RS Stock No. 828-7441
Mfr. Part No.AP3105NAKTR-G1
HK$2.308
Each (In a Pack of 25)
units
70 kHz 20µA 110µA - 2 mA - - - - - - Surface Mount SOT-23 -
RS Stock No. 790-2855
Mfr. Part No.AP6503ASP-13
HK$8.894
Each (On a Tape of 5)
units
260 kHz - - - - 0.925 → 20 V 3 A - Current 1 - Surface Mount SOIC 130ns
RS Stock No. 828-7444
Mfr. Part No.AP3105NVKTR-G1
HK$4.788
Each (In a Pack of 25)
units
70 kHz 20µA 110µA - 2 mA - - - - - - Surface Mount SOT-23 -
RS Stock No. 170-8911
Mfr. Part No.AP3105NVKTR-G1
HK$1.794
Each (On a Reel of 3000)
units
70 kHz 20µA 110µA - 2 mA - - - - - - Surface Mount SOT-23 -