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. 739-0284
Mfr. Part No.KA3525A
TWD32.20
Each (In a Pack of 5)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 145-4322
Mfr. Part No.KA3525A
TWD26.80
Each (In a Tube of 25)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 103-5077
Mfr. Part No.SG3525ANG
TWD31.60
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 689-9950
Mfr. Part No.SG3525ANG
TWD37.00
Each (In a Pack of 2)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
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. 162-9502
Mfr. Part No.NCP1379DR2G
TWD14.10
Each (On a Reel of 2500)
units
65 kHz - - - - 20 V -800 mA, 500 mA - Current 1 60ns Surface Mount SOIC 75ns
RS Stock No. 145-2939
Mfr. Part No.UC3842BVD1G
TWD26.00
Each (In a Tube of 98)
units
275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 786-6472
Mfr. Part No.NCP1379DR2G
TWD38.00
Each (In a Pack of 5)
units
65 kHz - - - - 20 V -800 (Sink) mA, 500 (Source) mA - Current 1 60ns Surface Mount SOIC 75ns
RS Stock No. 805-2857
Mfr. Part No.UC3842BVD1G
TWD26.00
Each (In a Pack of 25)
units
275 kHz - - - - 13.5 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 145-2943
Mfr. Part No.UC3844BVDG
TWD20.30
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. 805-4572
Mfr. Part No.UC3844BVDG
TWD20.30
Each (In a Pack of 25)
units
275 kHz - - - - 4.9 to 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 516-5152
Mfr. Part No.UC3843BNG
TWD19.00
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-2786
Mfr. Part No.UC3843BNG
TWD21.70
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 802-3118
Mfr. Part No.NCP1203P60G
TWD31.80
Each (In a Pack of 10)
units
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 516-5146
Mfr. Part No.UC3842BNG
TWD26.00
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 163-0083
Mfr. Part No.NCP1396ADR2G
TWD19.90
Each (On a Reel of 2500)
units
575 kHz - - - - - - - Voltage 1 20ns Surface Mount SOIC 40ns
RS Stock No. 145-4209
Mfr. Part No.UC3842BD1G
TWD20.90
Each (In a Tube of 98)
units
500 kHz - - - - 4.95 to 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 805-2848
Mfr. Part No.UC3842BD1G
TWD20.80
Each (In a Pack of 25)
units
500 kHz - - - - 4.95 to 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 864-4850
Mfr. Part No.FAN6921MRMY
TWD25.00
Each (On a Reel of 2500)
units
440 Hz - - - - - - - Current 1 70ns Surface Mount SOP 100ns
RS Stock No. 760-5841
Mfr. Part No.FAN6921MRMY
TWD56.00
Each (On a Tape of 5)
units
0.44 kHz - - - - 1.5 V - - Current 1 70ns Surface Mount SOP 110ns