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. 162-9675
Mfr. Part No.TL594CDR2G
HK$3.115
Each (On a Reel of 2500)
units
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS Stock No. 786-2552
Mfr. Part No.TL594CDR2G
HK$6.129
Each (In a Pack of 10)
units
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS Stock No. 178-5490
Mfr. Part No.UC1843J
HK$86.425
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 661-5232
Mfr. Part No.UC3526ADW
HK$27.852
Each (In a Pack of 5)
units
650 kHz - - - - - 100 mA - Voltage 2 100ns Surface Mount SOIC 300ns
RS Stock No. 922-3445
Mfr. Part No.UC3526ADW
HK$23.315
Each (In a Tube of 40)
units
- - - - - - - - - - - - - -
RS Stock No. 166-0930
Mfr. Part No.L6566B
HK$11.897
Each (In a Tube of 30)
units
107 kHz - - - - - 800 mA - - 1 - Surface Mount SOIC -
RS Stock No. 796-8461
Mfr. Part No.UC1843J
HK$147.90
Each
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 445-573
Mfr. Part No.L6566B
HK$14.018
Each (In a Pack of 5)
units
107 kHz - - - - - 800 mA - - 1 - Surface Mount SOIC -
RS Stock No. 714-7850
Mfr. Part No.SG3524P
HK$13.75
Each (In a Pack of 2)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS Stock No. 168-7318
Mfr. Part No.SG3524P
HK$11.639
Each (In a Tube of 50)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS Stock No. 714-1004
Mfr. Part No.SG3525AP
HK$14.025
Each (In a Pack of 2)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 857-8510
Mfr. Part No.ICE3B0365JFKLA1
BrandInfineon
HK$9.038
Each (In a Tube of 2000)
units
76 kHz - - - - - - - Current 1 30ns Through Hole PDIP 30ns
RS Stock No. 661-5229
Mfr. Part No.UC3525BDW
HK$53.78
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 145-4401
Mfr. Part No.FAN4801SNY
HK$11.639
Each (In a Tube of 25)
units
67 kHz 80µA 50µA -40µA 1 mA - - - - - - Through Hole PDIP -
RS Stock No. 168-6816
Mfr. Part No.SG3525AP
HK$11.572
Each (In a Tube of 50)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 920-3479
Mfr. Part No.TL494IN
HK$6.16
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 163-2713
Mfr. Part No.UC3843BD1G
HK$4.11
Each (In a Tube of 98)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 661-4989
Mfr. Part No.UC2525AN
HK$21.86
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 809-5009
Mfr. Part No.FAN4801SNY
HK$13.75
Each (In a Pack of 2)
units
67 kHz 80µA 50µA -40µA 1 mA - - - - - - Through Hole PDIP -
RS Stock No. 145-0998
Mfr. Part No.UC3525BDW
HK$46.978
Each (In a Tube of 40)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns