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. 923-3855
Mfr. Part No.UC3845N
MYR5.426
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8089
Mfr. Part No.UC3845N
MYR6.816
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-1004
Mfr. Part No.SG3525AP
MYR6.77
Each (In a Pack of 2)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 168-6816
Mfr. Part No.SG3525AP
MYR5.426
Each (In a Tube of 50)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 428-521
Mfr. Part No.SG3524N
MYR2.14
Each
units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 121-8308
Mfr. Part No.SG3524N
MYR1.625
Each (In a Tube of 25)
units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 739-0284
Mfr. Part No.KA3525A
MYR3.626
Each (In a Pack of 5)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 145-4322
Mfr. Part No.KA3525A
MYR2.62
Each (In a Tube of 25)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 415-1045
Mfr. Part No.L6598D
MYR10.23
Each
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 463-464
Mfr. Part No.UC3844BD1G
MYR2.20
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 796-8461
Mfr. Part No.UC1843J
MYR48.41
Each
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 178-5490
Mfr. Part No.UC1843J
MYR46.434
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 168-6083
Mfr. Part No.L6598D
MYR8.181
Each (In a Tube of 50)
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 170-3359
Mfr. Part No.UC3844BD1G
MYR2.20
Each (In a Tube of 98)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 166-0829
Mfr. Part No.ICE2QS03GXUMA1
BrandInfineon
MYR2.916
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
MYR3.645
Each (In a Pack of 10)
units
65 kHz 550µA - - 2.3 mA - - Yes - 1 - Surface Mount DSO -
RS Stock No. 919-8812
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
MYR8.34
Each (In a Tube of 50)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 528-123
Mfr. Part No.TL494CN
MYR1.732
Each (In a Tube of 25)
units
300 kHz - - - - 40(Max) V 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 753-2964
Mfr. Part No.ICE3BR0665JXKLA1
BrandInfineon
MYR9.82
Each (In a Pack of 2)
units
65 kHz - - - - 650 V 9.95 A - Current 1 30ns Through Hole DIP 30ns
RS Stock No. 166-1619
Mfr. Part No.FAN7602CMX
MYR1.258
Each (On a Reel of 2500)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns