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. 145-5737
Mfr. Part No.UC2843AD8
€1.176
Each (In a Tube of 75)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 786-8897
Mfr. Part No.NCP1271D100R2G
€0.592
Each (In a Pack of 10)
units
107 kHz - - - - 20 V -800 mA, 500 mA - Current 1 20ns Surface Mount SOIC 30ns
RS Stock No. 145-2943
Mfr. Part No.UC3844BVDG
€0.517
Each (In a Tube of 55)
units
275 kHz - - - - 4.9 to 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 184-8161
Mfr. Part No.BA17810FP-E2
BrandROHM
€0.889
Each (In a Pack of 10)
units
- - - - - 10 V 1 A - - - - Surface Mount TO-252 -
RS Stock No. 821-5095
Mfr. Part No.NCP1012ST130T3G
€0.824
Each (In a Pack of 20)
units
143 kHz - - - - - 550 mA - Current 1 10ns Surface Mount SOT-223 20ns
RS Stock No. 145-2888
Mfr. Part No.NCP1337PG
€0.745
Each (In a Tube of 50)
units
130 kHz - - - - 20 V 500 mA - Current 1 20ns Through Hole PDIP 50ns
RS Stock No. 923-3824
Mfr. Part No.UC2845N
€1.155
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 165-9320
Mfr. Part No.MAX1951ESA+
€2.513
Each (In a Tube of 100)
units
1100 kHz - - - - 5.5 V 2 A - - 1 - Surface Mount SOIC -
RS Stock No. 533-3844
Mfr. Part No.LM2611AMF/NOPB
€2.78
Each
units
1400 kHz - - - - -1.23 V - - - 1 - Surface Mount SOT-23 -
RS Stock No. 661-5279
Mfr. Part No.UC3825ADW
€7.05
Each
units
1000 kHz - - - - - 2 A - Current, Voltage 2 20ns Surface Mount SOIC 20ns
RS Stock No. 426-263
Mfr. Part No.VIPER22ADIP-E
€0.854
Each (In a Pack of 5)
units
60 kHz - - - - 730 V - - Current - 100ns Through Hole PDIP 50ns
RS Stock No. 661-5333
Mfr. Part No.UC3843AD8
€1.188
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 661-5229
Mfr. Part No.UC3525BDW
€5.08
Each
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 661-4970
Mfr. Part No.TL598CD
€1.554
Each (In a Pack of 5)
units
300 kHz - - - - - 200 mA - Voltage 2 35ns Surface Mount SOIC 60ns
RS Stock No. 162-6094
Mfr. Part No.UCC3889N
€1.891
Each (In a Tube of 50)
units
250 kHz - - - - 18 V - - Voltage 1 30ns Through Hole PDIP 35ns
RS Stock No. 828-7441
Mfr. Part No.AP3105NAKTR-G1
€0.11
Each (In a Pack of 25)
units
70 kHz 20µA 110µA - 2 mA - - - - - - Surface Mount SOT-23 -
RS Stock No. 620-0486
Mfr. Part No.UC2845AD8
€1.212
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 178-5490
Mfr. Part No.UC1843J
€7.104
Each (In a Tube of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole CDIP 150ns
RS Stock No. 121-9385
Mfr. Part No.UCC28950PW
€5.719
Each (In a Tube of 60)
units
1 MHz 270µA -0.5mA 5.75mA 10 mA - - Yes - - - Surface Mount TSSOP -
RS Stock No. 145-0807
Mfr. Part No.UC2842AN
€1.13
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns