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. 438-4021
Mfr. Part No.UC3875N
MYR51.694
Each (In a Tube of 20)
units
- - - - - - 500 mA - - 4 - Through Hole PDIP -
RS Stock No. 165-4035
Mfr. Part No.MIC2171WU-TR
BrandMicrochip
MYR14.898
Each (On a Reel of 750)
units
115 kHz - - - - 65 V 2.5 A - - 1 - Surface Mount TO-263 -
RS Stock No. 628-2804
Mfr. Part No.UCC28C44D
MYR6.808
Each (In a Pack of 5)
units
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS Stock No. 517-2986
Mfr. Part No.TL494IN
MYR3.216
Each (In a Pack of 5)
units
300 kHz - - - - - 200 (Max) mA - - - - Through Hole PDIP -
RS Stock No. 126-3181
Mfr. Part No.NCP12510BSN65T1G
MYR1.706
Each (In a Pack of 20)
units
65 kHz - - - - 8 to 14 V 300 mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 620-0638
Mfr. Part No.UCC3804N
MYR14.12
Each (In a Pack of 5)
units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 516-5146
Mfr. Part No.UC3842BNG
MYR2.30
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 184-1120
Mfr. Part No.UC2842BNG
MYR1.836
Each (In a Tube of 50)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole PDIP 150ns
RS Stock No. 923-3830
Mfr. Part No.UC3842AN
MYR5.00
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 919-8816
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
MYR10.63
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 620-0464
Mfr. Part No.UC2825DW
MYR22.836
Each (In a Pack of 5)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Surface Mount SOIC 30ns
RS Stock No. 103-5077
Mfr. Part No.SG3525ANG
MYR3.713
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 660-8023
Mfr. Part No.UC2844N
MYR6.014
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-0370
Mfr. Part No.UC2844N
MYR5.549
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 179-2072
Mfr. Part No.UCC3804N
MYR19.541
Each (In a Tube of 50)
units
1000 kHz - - - - - 1 A - Current 1 44ns Through Hole PDIP 41ns
RS Stock No. 462-4486
Mfr. Part No.UC2875DWP
MYR53.92
Each
units
1000 kHz - - - - - 500 mA - - 4 - Surface Mount SOIC -
RS Stock No. 922-3445
Mfr. Part No.UC3526ADW
MYR11.165
Each (In a Tube of 40)
units
- - - - - - - - - - - - - -
RS Stock No. 802-2134
Mfr. Part No.NCP1200P40G
MYR3.129
Each (In a Pack of 10)
units
48 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 686-5033
Mfr. Part No.UC3842BN
MYR2.129
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 753-2955
Mfr. Part No.ICE3A1565FKLA1
BrandInfineon
MYR11.55
Each (In a Pack of 2)
units
100 kHz - - - - 650 V 6.1 A - Current 1 30ns Through Hole DIP 30ns