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. 857-8510
Mfr. Part No.ICE3B0365JFKLA1
BrandInfineon
SGD1.529
Each (In a Tube of 2000)
units
76 kHz - - - - - - - Current 1 30ns Through Hole PDIP 30ns
RS Stock No. 379-6502
Mfr. Part No.UCC2806DW
SGD17.27
Each
units
52 kHz - - - - - 500 mA - Current 2 35ns Surface Mount SOIC 35ns
RS Stock No. 162-4435
Mfr. Part No.UCC2806DW
SGD15.66
Each (In a Tube of 40)
units
52 kHz - - - - - 500 mA - Current 2 35ns Surface Mount SOIC 35ns
RS Stock No. 121-8408
Mfr. Part No.UC3843AN
SGD1.736
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 526-842
Mfr. Part No.UC3843AN
SGD2.416
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-6749
Mfr. Part No.TL494CNSR
SGD0.357
Each (On a Reel of 2000)
units
300 kHz 9 to 15mA 200mA 200mA 3.5 mA - - Yes - - - Surface Mount SOIC -
RS Stock No. 809-5393
Mfr. Part No.TL494CNSR
SGD0.756
Each (In a Pack of 5)
units
300 kHz 9 to 15mA 200mA 200mA 3.5 mA - - Yes - - - Surface Mount SOIC -
RS Stock No. 145-2786
Mfr. Part No.UC3843BNG
SGD0.63
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 516-5152
Mfr. Part No.UC3843BNG
SGD0.78
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-4341
Mfr. Part No.TL5001CP
SGD2.272
Each (In a Tube of 50)
units
500 kHz - - - 2.1 mA 1 to 50 V 3 A - - 1 - Through Hole PDIP -
RS Stock No. 178-4732
Mfr. Part No.UC3844BNG
SGD0.63
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 535-9420
Mfr. Part No.LM3524DN/NOPB
SGD3.994
Each (In a Pack of 5)
units
350 kHz - - - - 60 V 200 mA - Voltage 2 100ns Through Hole MDIP 200ns
RS Stock No. 689-9950
Mfr. Part No.SG3525ANG
SGD1.57
Each (In a Pack of 2)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 103-5077
Mfr. Part No.SG3525ANG
SGD1.138
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 516-5168
Mfr. Part No.UC3844BNG
SGD0.89
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-6866
Mfr. Part No.TL494CDR
SGD0.424
Each (In a Pack of 10)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 121-8836
Mfr. Part No.LM3524DN/NOPB
SGD3.838
Each (In a Tube of 25)
units
350 kHz - - - - 60 V 200 mA - Voltage 2 100ns Through Hole MDIP 200ns
RS Stock No. 200-6779
Mfr. Part No.TL5001CP
SGD2.67
Each
units
500 kHz - - - 2.1 mA 1 → 50 V 3 (Max) A - - 1 - Through Hole PDIP -
RS Stock No. 145-5980
Mfr. Part No.TL494CDR
SGD0.181
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 661-5493
Mfr. Part No.UCC2801D
SGD4.19
Each
units
1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns