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. 121-8574
Mfr. Part No.UC2875DWP
SGD18.06
Each (In a Tube of 20)
units
- - - - - - - - - - - - - -
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. 121-8412
Mfr. Part No.UC2843AN
SGD2.009
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
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. 178-9073
Mfr. Part No.TL594CN
SGD1.588
Each (In a Tube of 25)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 45ns Through Hole PDIP 200ns
RS Stock No. 709-2182
Mfr. Part No.TL594CN
SGD1.48
Each (In a Pack of 5)
units
300 kHz - - - - 40 V 200 mA - Voltage 2 45ns Through Hole PDIP 200ns
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. 620-0593
Mfr. Part No.UC3846N
SGD7.634
Each (In a Pack of 5)
units
500 kHz - - - - - 500 mA - Current 2 50ns Through Hole PDIP 50ns
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. 534-3447
Mfr. Part No.LM5030MM/NOPB
SGD4.04
Each
units
600 kHz - - - - - 1.5 A - Current 2 16ns Surface Mount MSOP 16ns
RS Stock No. 661-5440
Mfr. Part No.UC3875DWP
SGD20.16
Each
units
1000 kHz - - - - - 500 mA - - 4 - Surface Mount SOIC -
RS Stock No. 168-8921
Mfr. Part No.SG3525AN
SGD2.06
Each (In a Tube of 25)
units
400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
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. 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
RS Stock No. 145-4460
Mfr. Part No.FAN4800ASNY
SGD1.341
Each (In a Tube of 25)
units
- 80µA 50µA -40µA, -35 μA 5 mA - - - - 2 - Through Hole PDIP -
RS Stock No. 786-8872
Mfr. Part No.NCP1251BSN65T1G
SGD0.697
Each (In a Pack of 10)
units
71 kHz - - - - 28.3 V -500 (Sink) mA, 300 (Source) mA - Current 1 30ns Surface Mount TSOP 40ns
RS Stock No. 821-3043
Mfr. Part No.CS5124XD8G
SGD4.978
Each (In a Pack of 5)
units
440 kHz - - - - 2 V 1.5 A - Current 1 55ns Surface Mount SOIC 65ns
RS Stock No. 660-8089
Mfr. Part No.UC3845N
SGD2.552
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-1004
Mfr. Part No.SG3525AP
SGD2.69
Each (In a Pack of 2)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns