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. 753-2964
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
$4.17
Each (In a Pack of 2)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 919-8812
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
$3.292
Each (In a Tube of 50)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 919-8816
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
$3.70
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 462-7249
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
$5.32
Each (In a Pack of 5)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 857-8510
Mfr. Part No.ICE3B0365JFKLA1
BrandInfineon
$1.493
Each (In a Tube of 2000)
units
76 kHz - - - - - - - Current 1 30ns Through Hole PDIP 30ns
RS Stock No. 166-0829
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
$0.871
Each (On a Reel of 2500)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS Stock No. 110-9090
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
$1.572
Each (In a Pack of 10)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS Stock No. 110-7480
Mfr. Part No.ICE3A1065ELJFKLA1
BrandInfineon
$2.016
Each (In a Pack of 10)
units
113 kHz - - - - - - - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 168-7402
Mfr. Part No.ICE3A1565FKLA1
BrandInfineon
$3.675
Each (In a Tube of 50)
units
100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 753-2955
Mfr. Part No.ICE3A1565FKLA1
BrandInfineon
$4.325
Each (In a Pack of 2)
units
100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 168-5881
Mfr. Part No.ICE3A1065ELJFKLA1
BrandInfineon
$1.911
Each (In a Tube of 50)
units
113 kHz - - - - - - - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 166-1149
Mfr. Part No.ICE3BS03LJGXUMA1
BrandInfineon
$0.823
Each (On a Reel of 2500)
units
73.7 kHz - - - - - - - Current 1 55ns Surface Mount DSO 150ns
RS Stock No. 110-7467
Mfr. Part No.ICE3BS03LJGXUMA1
BrandInfineon
$1.566
Each (In a Pack of 20)
units
73.7 kHz - - - - - - - Current 1 55ns Surface Mount DSO 150ns