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. 162-9675
Mfr. Part No.TL594CDR2G
HK$3.115
Each (On a Reel of 2500)
units
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS Stock No. 786-2552
Mfr. Part No.TL594CDR2G
HK$7.256
Each (In a Pack of 10)
units
300 kHz 8mA -4mA 0.7mA 18 mA - - - - - - Surface Mount SOIC -
RS Stock No. 163-2713
Mfr. Part No.UC3843BD1G
HK$4.11
Each (In a Tube of 98)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 689-9954
Mfr. Part No.UC3843BD1G
HK$6.11
Each (In a Pack of 2)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 808-4012
Mfr. Part No.UC3843BD1R2G
HK$4.641
Each (In a Pack of 25)
units
275 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 166-1621
Mfr. Part No.FAN6300AMY
HK$3.767
Each (On a Reel of 2500)
units
190 kHz - - - - 4.5 V 150 mA - Current 1 120ns Surface Mount SOP 200ns
RS Stock No. 739-0284
Mfr. Part No.KA3525A
HK$8.536
Each (In a Pack of 5)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 163-0829
Mfr. Part No.UC3843BD1R2G
HK$2.027
Each (On a Reel of 2500)
units
275 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 739-6074
Mfr. Part No.FAN6300HMY
HK$8.18
Each (In a Pack of 5)
units
190 kHz - - - - 7.5 V - - Current - 120ns Surface Mount SOP 200ns
RS Stock No. 166-2461
Mfr. Part No.FAN6300HMY
HK$3.348
Each (On a Reel of 2500)
units
190 kHz - - - - 7.5 V - - Current - 120ns Surface Mount SOP 200ns
RS Stock No. 802-2134
Mfr. Part No.NCP1200P40G
HK$7.56
Each (In a Pack of 10)
units
48 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS Stock No. 753-2661
Mfr. Part No.NCP3170ADR2G
HK$8.81
Each (In a Pack of 2)
units
550 kHz - - - - 0.8 V 3 A - - 1 - Surface Mount SOIC -
RS Stock No. 800-7425
Mfr. Part No.FAN6300AMY
HK$7.308
Each (In a Pack of 10)
units
190 kHz - - - - 4.5 V 150 mA - Current 1 120ns Surface Mount SOP 200ns
RS Stock No. 145-4322
Mfr. Part No.KA3525A
HK$7.088
Each (In a Tube of 25)
units
430 kHz - - - - 2 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 786-8866
Mfr. Part No.NCP1250BSN65T1G
HK$4.683
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. 102-3497
Mfr. Part No.UC3842BNG
HK$5.754
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 772-8871
Mfr. Part No.FAN7602CMX
HK$6.573
Each (In a Pack of 10)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 516-5152
Mfr. Part No.UC3843BNG
HK$6.92
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 166-1619
Mfr. Part No.FAN7602CMX
HK$2.287
Each (On a Reel of 2500)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 103-5093
Mfr. Part No.NCP3170ADR2G
HK$3.539
Each (On a Reel of 2500)
units
550 kHz - - - - 0.8 V 3 A - - 1 - Surface Mount SOIC -