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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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(Price shown excludes VAT) 		Part Details Brand Stock Maximum Switching Frequency Start-up Supply Current Maximum Source Current Maximum Sink Current Output Voltage Maximum Supply Current Output Current Control Method Number of Outputs Mounting Type Fall Time Rise Time Package Type Pin Count Topology Maximum Duty Cycle Dimensions Length PWM Controller Type Width Height Minimum Operating Supply Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Operating Supply Voltage
ROHM BD71837AMWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 68-Pin, UQFN68CV8080
ROHM BD71837AMWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 68-Pin, UQFN68CV8080
  • £ 2.646
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  • RS Stock No. 215-9597
  • Brand ROHM
  • Mfr. Part No. BD71837AMWV-E2
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ROHM BD71837AMWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 68-Pin, UQFN68CV8080
ROHM BD71837AMWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 68-Pin, UQFN68CV8080
  • £ 4.565
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  • RS Stock No. 215-9598
  • Brand ROHM
  • Mfr. Part No. BD71837AMWV-E2
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ROHM BD71850MWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 56-Pin, UQFN56BV7070
ROHM BD71850MWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 56-Pin, UQFN56BV7070
  • £ 2.644
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  • RS Stock No. 215-9600
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  • Mfr. Part No. BD71850MWV-E2
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ROHM BD71850MWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 56-Pin, UQFN56BV7070
ROHM BD71850MWV-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 56-Pin, UQFN56BV7070
  • £ 2.303
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  • RS Stock No. 215-9599
  • Brand ROHM
  • Mfr. Part No. BD71850MWV-E2
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ROHM BD7185AGWL-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 80-Pin, UCSP50L3C
ROHM BD7185AGWL-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 80-Pin, UCSP50L3C
  • £ 3.528
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  • RS Stock No. 215-9601
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  • Mfr. Part No. BD7185AGWL-E2
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ROHM BD7185AGWL-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 80-Pin, UCSP50L3C
ROHM BD7185AGWL-E2, Power Factor & PWM Controller, 5.5 V, 2 MHz 80-Pin, UCSP50L3C
  • £ 4.96
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  • RS Stock No. 215-9602
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ON Semiconductor NCP12700ADNR2G, PWM Controller, 100 V, 1 MHz 10-Pin, MSOP
ON Semiconductor NCP12700ADNR2G, PWM Controller, 100 V, 1 MHz 10-Pin, MSOP
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ON Semiconductor NCV1077STBT3G, PWM Controller, 8.2 V, 100 kHz 3 + Tab-Pin, SOT-223
ON Semiconductor NCV1077STBT3G, PWM Controller, 8.2 V, 100 kHz 3 + Tab-Pin, SOT-223
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ON Semiconductor NCP12700BDNR2G, PWM Controller, 100 V, 1 MHz 10-Pin, MSOP
ON Semiconductor NCP12700BDNR2G, PWM Controller, 100 V, 1 MHz 10-Pin, MSOP
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ON Semiconductor FAN65004B, PWM Controller, 65 V, 1 MHz 35-Pin, PQFN
ON Semiconductor FAN65004B, PWM Controller, 65 V, 1 MHz 35-Pin, PQFN
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ON Semiconductor NCP4306DAHZZAASNT1G, PWM Controller, 35 V, 1 MHz 6-Pin, TSOP
ON Semiconductor NCP4306DAHZZAASNT1G, PWM Controller, 35 V, 1 MHz 6-Pin, TSOP
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ON Semiconductor NCP4306DADZZDASNT1G, PWM Controller, 35 V, 1 MHz 6-Pin, TSOP
ON Semiconductor NCP4306DADZZDASNT1G, PWM Controller, 35 V, 1 MHz 6-Pin, TSOP
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Maxim Integrated MAX668EUB+T, PWM Controller, 28 V, 500 kHz 10-Pin, μSOP
Maxim Integrated MAX668EUB+T, PWM Controller, 28 V, 500 kHz 10-Pin, μSOP
  • £ 2.166
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ON Semiconductor NCV1063AD100R2G, PWM Controller, 9 V, 100 kHz 16-Pin, SOIC
ON Semiconductor NCV1063AD100R2G, PWM Controller, 9 V, 100 kHz 16-Pin, SOIC
  • £ 0.48
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ON Semiconductor NCV1060BD100R2G, PWM Controller, 9 V, 65 kHz 10-Pin, SOIC
ON Semiconductor NCV1060BD100R2G, PWM Controller, 9 V, 65 kHz 10-Pin, SOIC
  • £ 0.386
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ON Semiconductor NCP1239KD65R2G, PWM Controller, 35 V, 65 kHz 7-Pin, SOIC
ON Semiconductor NCP1239KD65R2G, PWM Controller, 35 V, 65 kHz 7-Pin, SOIC
  • £ 0.196
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ON Semiconductor NCP12400CBAAB0DR2G, PWM Controller, 28 V, 65 kHz 7-Pin, SOIC
ON Semiconductor NCP12400CBAAB0DR2G, PWM Controller, 28 V, 65 kHz 7-Pin, SOIC
  • £ 0.267
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ON Semiconductor NCP13992AADR2G, PWM Controller, 20 V, 750 kHz 16-Pin, SOIC
ON Semiconductor NCP13992AADR2G, PWM Controller, 20 V, 750 kHz 16-Pin, SOIC
  • £ 0.511
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Maxim Integrated MAX8521ETP+T, PWM Controller, 5.5 V, 1 MHz 20-Pin, TQFN
Maxim Integrated MAX8521ETP+T, PWM Controller, 5.5 V, 1 MHz 20-Pin, TQFN
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ON Semiconductor NCP4306AADZZZADR2G, PWM Controller, 35 V, 1 MHz 8-Pin, SOIC
ON Semiconductor NCP4306AADZZZADR2G, PWM Controller, 35 V, 1 MHz 8-Pin, SOIC
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