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. 516-5174
Mfr. Part No.UC3845BNG
SGD0.83
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 661-6875
Mfr. Part No.TL494IDR
SGD0.648
Each (In a Pack of 5)
units
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS Stock No. 620-0622
Mfr. Part No.UCC3802D
SGD5.008
Each (In a Pack of 5)
units
1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS Stock No. 162-9679
Mfr. Part No.UC3845BD1R2G
SGD0.276
Each (On a Reel of 2500)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 919-8816
Mfr. Part No.ICE2A265FKLA1
BrandInfineon
SGD3.959
Each (In a Tube of 50)
units
- - - - - 650 V 2 A - - 1 - Through Hole PDIP -
RS Stock No. 121-8957
Mfr. Part No.UC3846N
SGD5.805
Each (In a Tube of 25)
units
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
RS Stock No. 786-6670
Mfr. Part No.UC3845BD1R2G
SGD0.765
Each (In a Pack of 10)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 714-1149
Mfr. Part No.UC2845BN
SGD1.251
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 912-9885
Mfr. Part No.ADP2303ARDZ-5.0-R7
SGD2.871
Each (On a Reel of 1000)
units
700 kHz - - - - 5 V 3 A - Current 1 280ns Surface Mount SOIC 170ns
RS Stock No. 168-6829
Mfr. Part No.UC2845BN
SGD1.197
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 165-4050
Mfr. Part No.MIC2172YM-TR
BrandMicrochip
SGD3.29
Each (On a Reel of 2500)
units
115 kHz - - - - 65 V 1.25 A - Current 1 - Surface Mount SOIC -
RS Stock No. 911-2727
Mfr. Part No.MIC2172YM-TR
BrandMicrochip
SGD4.32
Each (In a Pack of 5)
units
115 kHz - - - - 65 V 1.25 A - Current 1 - Surface Mount SOIC -
RS Stock No. 660-8035
Mfr. Part No.UC2845N
SGD2.552
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-4747
Mfr. Part No.LM5030MM/NOPB
SGD2.00
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 923-3824
Mfr. Part No.UC2845N
SGD2.174
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 761-8342
Mfr. Part No.LT1619ES8#PBF
SGD8.16
Each
units
360 kHz - - - - - 1.5 A - Current 1 35ns Surface Mount SOIC 30ns
RS Stock No. 462-4486
Mfr. Part No.UC2875DWP
SGD21.85
Each
units
1000 kHz - - - - - 500 mA - - 4 - Surface Mount SOIC -
RS Stock No. 526-874
Mfr. Part No.UC2843AN
SGD2.41
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 660-8076
Mfr. Part No.UC3842AN
SGD2.35
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 759-2922
Mfr. Part No.ADP2303ARDZ-5.0-R7
SGD4.81
Each
units
700 kHz - - - - 5 V 3 A - Current 1 280ns Surface Mount SOIC 170ns