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. 714-1155
Mfr. Part No.UC3845BN
TWD24.30
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6830
Mfr. Part No.UC3845BN
TWD24.30
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-5116
Mfr. Part No.UC2845AD
TWD49.80
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 786-6630
Mfr. Part No.UC3842BD1R2G
TWD19.70
Each (In a Pack of 10)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 628-2860
Mfr. Part No.UCC28C45D
TWD82.20
Each (In a Pack of 5)
units
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
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. 761-8342
Mfr. Part No.LT1619ES8#PBF
TWD185.00
Each
units
360 kHz - - - - - 1.5 A - Current 1 35ns Surface Mount SOIC 30ns
RS Stock No. 661-5364
Mfr. Part No.UC3845D
TWD51.40
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 620-0559
Mfr. Part No.UC3825DW
TWD174.60
Each (In a Pack of 5)
units
1000 kHz - - - - - 1.5 A - Current, Voltage 2 30ns Surface Mount SOIC 30ns
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. 660-8076
Mfr. Part No.UC3842AN
TWD55.60
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
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. 686-8433
Mfr. Part No.L6598
TWD80.00
Each (In a Pack of 2)
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Through Hole PDIP -
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. 178-9073
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. 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. 162-8863
Mfr. Part No.UCC28251RGPT
TWD102.40
Each (On a Reel of 250)
units
1.8 MHz 275µA 8mA 9mA 275 μA - - Yes - - - Surface Mount QFN -
RS Stock No. 516-5152
Mfr. Part No.UC3843BNG
TWD26.00
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-8876
Mfr. Part No.SG2525AN
TWD40.70
Each (In a Tube of 25)
units
400 kHz 80µA 400mA 400mA 20 mA 5.05 to 5.15 V 500 mA - - 2 - Through Hole PDIP -
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