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. 415-1045
Mfr. Part No.L6598D
$5.19
Each
units
400 kHz 0.25mA 250mA 450mA 25 mA - - - - - - Surface Mount SOIC -
RS Stock No. 428-521
Mfr. Part No.SG3524N
$1.01
Each
units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 102-8628
Mfr. Part No.SG2525AP
$2.312
Each (In a Tube of 50)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 688-8831
Mfr. Part No.NCP1014ST65T3G
$2.01
Each (In a Pack of 2)
units
71 kHz - - - - - - - Current 1 - Surface Mount SOT-223 20ns
RS Stock No. 121-8952
Mfr. Part No.UC3525ADW
$3.02
Each (In a Tube of 40)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 516-5168
Mfr. Part No.UC3844BNG
$1.97
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 226-9857
Mfr. Part No.UC3879N
$16.96
Each
units
300 kHz - - - - - 100 mA - - 4 - Through Hole PDIP -
RS Stock No. 660-8035
Mfr. Part No.UC2845N
$2.736
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 805-2844
Mfr. Part No.UC2843BD1G
$0.936
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. 168-7315
Mfr. Part No.UC2845BD1
$0.973
Each (In a Tube of 100)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 121-9155
Mfr. Part No.UC3856DW
$9.742
Each (In a Tube of 40)
units
220 kHz - - - - - 1.5 A - Current 2 40ns Surface Mount SOIC 40ns
RS Stock No. 145-7139
Mfr. Part No.UC2845D
$1.97
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 661-5349
Mfr. Part No.UC3843N
$2.628
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 923-3824
Mfr. Part No.UC2845N
$2.268
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-7856
Mfr. Part No.SG2525AP
$2.50
Each (In a Pack of 2)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 739-0284
Mfr. Part No.KA3525A
$2.158
Each (In a Pack of 5)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 121-8308
Mfr. Part No.SG3524N
$0.788
Each (In a Tube of 25)
units
450 kHz - - - - - 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 620-0515
Mfr. Part No.UC3525ADW
$3.796
Each (In a Pack of 5)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 923-3849
Mfr. Part No.UC3842N
$2.405
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-2786
Mfr. Part No.UC3843BNG
$1.308
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns