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. 162-6045
Mfr. Part No.UC3842AD
£0.865
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 516-5146
Mfr. Part No.UC3842BNG
£0.44
Each
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 620-0543
Mfr. Part No.UC3525AN
£1.86
Each (In a Pack of 5)
Units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 877-2826
Mfr. Part No.SG2525AN
£0.861
Each (In a Pack of 10)
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400 kHz 80µA 400mA 400mA 20 mA 5.05 to 5.15 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 415-1045
Mfr. Part No.L6598D
£1.84
Each
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400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 102-3497
Mfr. Part No.UC3842BNG
£0.373
Each (In a Tube of 50)
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500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6083
Mfr. Part No.L6598D
£1.55
Each (In a Tube of 50)
Units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 460-960
Mfr. Part No.LM78S40CN/NOPB
£1.724
Each (In a Pack of 5)
Units
100 kHz - - - - 40 V - - - 1 - Through Hole MDIP -
RS Stock No. 162-6066
Mfr. Part No.UCC2804N
£2.203
Each (In a Tube of 50)
Units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 661-5529
Mfr. Part No.UCC2804N
£2.65
Each
Units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 145-2786
Mfr. Part No.UC3843BNG
£0.373
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 923-3846
Mfr. Part No.UC3845AN
£0.977
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8085
Mfr. Part No.UC3845AN
£1.206
Each (In a Pack of 5)
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 516-5152
Mfr. Part No.UC3843BNG
£0.44
Each
Units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 857-8510
Mfr. Part No.ICE3B0365JFKLA1
BrandInfineon
£0.752
Each (In a Tube of 2000)
Units
76 kHz - - - - - - - Current 1 30ns Through Hole PDIP 30ns
RS Stock No. 145-5951
Mfr. Part No.UC2843AD
£1.038
Each (In a Tube of 50)
Units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 661-6866
Mfr. Part No.TL494CDR
£0.257
Each (In a Pack of 10)
Units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 145-5980
Mfr. Part No.TL494CDR
£0.095
Each (On a Reel of 2500)
Units
300 kHz - - - - 40 V 200 mA - Voltage 2 40ns Surface Mount SOIC 100ns
RS Stock No. 170-4519
Mfr. Part No.XRP6124HVES0.5-F
BrandMaxLinear
£0.138
Each (In a Bag of 200)
Units
1000 kHz - - - - 1.2 to 12 V 4 A - Voltage 1 35ns Surface Mount SOT-23 45ns
RS Stock No. 753-2661
Mfr. Part No.NCP3170ADR2G
£0.635
Each (In a Pack of 2)
Units
550 kHz - - - - 0.8 V 3 A - - 1 - Surface Mount SOIC -