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. 620-0458
Mfr. Part No.UC2843AD8
MYR6.866
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-9164
Mfr. Part No.TL494IDR
MYR0.728
Each (On a Reel of 2500)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 145-6183
Mfr. Part No.UC2524AN
MYR8.34
Each (In a Tube of 25)
units
- - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 460-960
Mfr. Part No.LM78S40CN/NOPB
MYR8.094
Each (In a Pack of 5)
units
100 kHz - - - - 40 V - - - 1 - Through Hole MDIP -
RS Stock No. 436-3305
Mfr. Part No.UC3825N
MYR23.46
Each
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Through Hole PDIP 30ns
RS Stock No. 661-6875
Mfr. Part No.TL494IDR
MYR1.438
Each (In a Pack of 5)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 121-8574
Mfr. Part No.UC2875DWP
MYR52.156
Each (In a Tube of 20)
units
- - - - - - - - - - - - - -
RS Stock No. 911-2957
Mfr. Part No.MIC2171WU-TR
BrandMicrochip
MYR19.84
Each (In a Pack of 2)
units
115 kHz - - - - 65 V 2.5 A - - 1 - Surface Mount TO-263 -
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. 178-9140
Mfr. Part No.UC2825DW
MYR17.489
Each (In a Tube of 40)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Surface Mount SOIC 30ns
RS Stock No. 162-8991
Mfr. Part No.NCP1203D60R2G
MYR1.903
Each (On a Reel of 2500)
units
60 kHz - - - - - 250 mA - Current 1 28ns Surface Mount SOIC 67ns
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. 802-3105
Mfr. Part No.NCP1203D60R2G
MYR3.29
Each (In a Pack of 10)
units
60 kHz - - - - - 250 mA - Current 1 28ns Surface Mount SOIC 67ns
RS Stock No. 100-0725
Mfr. Part No.LM78S40CN/NOPB
MYR7.661
Each (In a Tube of 25)
units
100 kHz - - - - 40 V - - - 1 - Through Hole MDIP -
RS Stock No. 162-8992
Mfr. Part No.NCP1203P60G
MYR3.095
Each (In a Tube of 50)
units
60 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. 169-5584
Mfr. Part No.TL2845P
MYR2.513
Each (In a Tube of 50)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Through Hole PDIP 50ns
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. 920-3479
Mfr. Part No.TL494IN
MYR2.234
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - - - - Through Hole PDIP -
RS Stock No. 689-9950
Mfr. Part No.SG3525ANG
MYR4.465
Each (In a Pack of 2)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns