PWM

Electronic circuits can contain both analogue and digital components. PWM, which stands for Pulse Width Modulation, facilitates the control of analogue devices using a digital signal. Many electrical designs use PWM for regulation, with PWM used as a way to reduce the average power that is delivered by an electrical signal by chopping it up into smaller parts. RS Components offer a range of PWM Controllers from a multitude of trusted brands, including ON Semiconductor, STMicroelectronics, Texas Instruments, and more.

What do PWMs do?

Analogue signals can be on or off, or can even be put into a position half-way between the two, whereas a digital signal has just on or off positions. Both signals appear in electronic circuits and can often be required to work together. Inputs can be converted using a DAC (digital-to-analogue converter) or an ADC (analogue-to-digital converter). PWM is available to control the output of a device: for example, PWM can convert the digital output of a microcontroller (MCU) into an analogue signal to drive the next analogue component.

Types of PWM devices:

  • 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 a duty cycle?

PWM signals feature two main things: frequency and a duty cycle. Duty cycle is given as a percentage (%) 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 are PWM controllers 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. 121-8955
Mfr. Part No.UC3825DW
TWD148.60
Each (In a Tube of 40)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Surface Mount SOIC 30ns
RS Stock No. 179-1755
Mfr. Part No.UC3842AD8
TWD38.00
Each (In a Tube of 75)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 168-6471
Mfr. Part No.L6598
TWD67.80
Each (In a Tube of 25)
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Through Hole PDIP -
RS Stock No. 661-6869
Mfr. Part No.TL3843DR-8
TWD22.60
Each (In a Pack of 5)
units
500 kHz - - - - 30 V 200 mA - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 809-5393
Mfr. Part No.TL494CNSR
TWD23.40
Each (In a Pack of 5)
units
300 kHz 9 to 15mA 200mA 200mA 3.5 mA - - Yes - - - Surface Mount SOIC -
RS Stock No. 825-5488
Mfr. Part No.UCC28251RGPT
TWD164.00
Each (In a Pack of 2)
units
1.8 MHz 275µA 8mA 9mA 275 μA - - Yes - - - Surface Mount QFN -
RS Stock No. 805-4572
Mfr. Part No.UC3844BVDG
TWD22.00
Each (In a Pack of 25)
units
275 kHz - - - - 4.9 to 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 877-2826
Mfr. Part No.SG2525AN
TWD45.40
Each (In a Pack of 10)
units
400 kHz 80µA 400mA 400mA 20 mA 5.05 to 5.15 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 714-7838
Mfr. Part No.UC2845BD1
TWD26.20
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 660-8076
Mfr. Part No.UC3842AN
TWD56.40
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 709-2182
Mfr. Part No.TL594CN
TWD33.60
Each (In a Pack of 5)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 45ns Through Hole PDIP 200ns
RS Stock No. 178-5493
Mfr. Part No.UC1845J
TWD691.30
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 145-6386
Mfr. Part No.UC3845D
TWD39.60
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-8975
Mfr. Part No.UCC28C45D
TWD55.30
Each (In a Tube of 75)
units
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS Stock No. 178-9073
Mfr. Part No.TL594CN
TWD35.90
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 45ns Through Hole PDIP 200ns
RS Stock No. 516-5146
Mfr. Part No.UC3842BNG
TWD30.00
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-6048
Mfr. Part No.UC3843D8
TWD45.10
Each (In a Tube of 75)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 923-3846
Mfr. Part No.UC3845AN
TWD50.50
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 802-3118
Mfr. Part No.NCP1203P60G
TWD31.80
Each (In a Pack of 10)
units
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 923-3849
Mfr. Part No.UC3842N
TWD50.50
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns