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. 170-3427
Mfr. Part No.UC3845BD1G
TWD18.20
Each (In a Tube of 98)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 462-1083
Mfr. Part No.TL1451ACD
TWD73.00
Each (In a Pack of 5)
units
- - - - - - - - - - - Surface Mount SOIC -
RS Stock No. 162-4437
Mfr. Part No.UCC3580D-3
TWD162.50
Each (In a Tube of 40)
units
430 kHz - - - - - 1 A - Voltage 2 20ns Surface Mount SOIC 40ns
RS Stock No. 661-5440
Mfr. Part No.UC3875DWP
TWD450.00
Each
units
1000 kHz - - - - - 500 mA - - 4 - Surface Mount SOIC -
RS Stock No. 184-1122
Mfr. Part No.UC2843BNG
TWD21.70
Each (In a Tube of 50)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole PDIP 150ns
RS Stock No. 162-8998
Mfr. Part No.NCP1380BDR2G
TWD14.30
Each (On a Reel of 2500)
units
65 kHz - - - - 15.5 V 800 mA - Current 1 60ns Surface Mount SOIC 75ns
RS Stock No. 426-297
Mfr. Part No.VIPER100A-E
TWD141.00
Each
units
110 kHz - - - - - 3 A - Current 1 100ns Through Hole PENTAWATT 50ns
RS Stock No. 761-5258
Mfr. Part No.LM5025AMTC/NOPB
TWD111.00
Each
units
1000 kHz - - - - - 1 A, 3 A - Voltage 2 15ns Surface Mount TSSOP 20ns
RS Stock No. 178-4278
Mfr. Part No.FAN65004B
TWD70.20
Each (On a Reel of 3000)
units
1 MHz - - - - 5.25 V 6 A - Voltage 1 200ns Surface Mount PQFN 200ns
RS Stock No. 162-6051
Mfr. Part No.UC3845AD
TWD45.10
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 165-9320
Mfr. Part No.MAX1951ESA+
TWD107.20
Each (In a Tube of 100)
units
1100 kHz - - - - 5.5 V 2 A - - 1 - Surface Mount SOIC -
RS Stock No. 165-8404
Mfr. Part No.AP3125AKTR-G1
TWD9.20
Each (On a Reel of 3000)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-26 250ns
RS Stock No. 181-348
Mfr. Part No.LM5022MM/NOPB
TWD96.60
Each (In a Pack of 5)
units
2 MHz - - - 4 mA - - - - 1 - Surface Mount MSOP -
RS Stock No. 100-0725
Mfr. Part No.LM78S40CN/NOPB
TWD67.20
Each (In a Tube of 25)
units
100 kHz - - - - 40 V - - - 1 - Through Hole MDIP -
RS Stock No. 162-7708
Mfr. Part No.LM5046MH/NOPB
TWD195.90
Each (In a Tube of 48)
units
540 kHz 80mA 1.5A 2A 4.6 mA - - Yes - - - Surface Mount HTSSOP -
RS Stock No. 170-8908
Mfr. Part No.AP3105KTR-G1
TWD6.00
Each (On a Reel of 3000)
units
70 kHz - - - - - 350 mA - Current 1 100ns Surface Mount SOT-23 250ns
RS Stock No. 786-8888
Mfr. Part No.NCP1252CDR2G
TWD30.80
Each (In a Pack of 5)
units
550 kHz - - - - 10 V -800 (Sink) mA, 500 (Source) mA - Current 1 22ns Surface Mount SOIC 26ns
RS Stock No. 786-8812
Mfr. Part No.NCP1216AP65G
TWD41.40
Each (In a Pack of 5)
units
71.5 kHz - - - - 10 V 500 mA - Current 1 20ns Through Hole PDIP 60ns
RS Stock No. 620-0587
Mfr. Part No.UCC3800D
TWD110.60
Each (In a Pack of 5)
units
1000 kHz - - - - - 1 A - Current 1 44ns Surface Mount SOIC 41ns
RS Stock No. 786-6614
Mfr. Part No.UC2842BDG
TWD23.40
Each (In a Pack of 5)
units
250 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns