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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Omschrijving Prijs 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-stocknr. 162-9679
FabrikantnummerUC3845BD1R2G
FabrikantON Semiconductor
€ 0,163
Each (On a Reel of 2500)
Aantal stuks
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS-stocknr. 686-5033
FabrikantnummerUC3842BN
€ 0,544
Each (In a Pack of 10)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 145-6183
FabrikantnummerUC2524AN
€ 1,706
Each (In a Tube of 25)
Aantal stuks
- - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS-stocknr. 438-4021
FabrikantnummerUC3875N
€ 10,718
Each (In a Tube of 20)
Aantal stuks
- - - - - - 500 mA - - 4 - Through Hole PDIP -
RS-stocknr. 661-5594
FabrikantnummerUCC2808AD-2
€ 3,07
Each
Aantal stuks
1000 kHz - - - - - 1 A - Current 2 25ns Surface Mount SOIC 25ns
RS-stocknr. 121-9164
FabrikantnummerTL494IDR
€ 0,126
Each (On a Reel of 2500)
Aantal stuks
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS-stocknr. 714-1149
FabrikantnummerUC2845BN
€ 0,667
Each (In a Pack of 10)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 168-7317
FabrikantnummerUC3844BN
€ 0,617
Each (In a Tube of 50)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 162-6069
FabrikantnummerUCC2808AD-2
€ 2,609
Each (In a Tube of 75)
Aantal stuks
1000 kHz - - - - - 1 A - Current 2 25ns Surface Mount SOIC 25ns
RS-stocknr. 661-6875
FabrikantnummerTL494IDR
€ 0,448
Each (In a Pack of 5)
Aantal stuks
300 kHz - - - - 40 V 200 mA - Voltage - 40ns Surface Mount SOIC 100ns
RS-stocknr. 689-9966
FabrikantnummerUC3845BD1G
FabrikantON Semiconductor
€ 0,485
Each (In a Pack of 2)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 145-0921
FabrikantnummerLM5070MTC-50/NOPB
€ 2,565
Each (In a Tube of 92)
Aantal stuks
- - 800mA 800mA 3 mA - - - - - - Surface Mount TSSOP -
RS-stocknr. 168-6829
FabrikantnummerUC2845BN
€ 0,667
Each (In a Tube of 50)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 714-7847
FabrikantnummerUC3844BN
€ 0,617
Each (In a Pack of 10)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 919-6478
FabrikantnummerUC3842BN
€ 0,543
Each (In a Tube of 50)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS-stocknr. 170-3427
FabrikantnummerUC3845BD1G
FabrikantON Semiconductor
€ 0,385
Each (In a Tube of 98)
Aantal stuks
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS-stocknr. 761-5980
FabrikantnummerLM5070MTC-50/NOPB
€ 3,09
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Aantal stuks
- - 800mA 800mA 3 mA - - - - - - Surface Mount TSSOP -
RS-stocknr. 162-8992
FabrikantnummerNCP1203P60G
FabrikantON Semiconductor
€ 0,755
Each (In a Tube of 50)
Aantal stuks
60 kHz - - - - - 250 mA - Current 1 28ns Through Hole PDIP 67ns
RS-stocknr. 821-5095
FabrikantnummerNCP1012ST130T3G
FabrikantON Semiconductor
€ 0,824
Each (In a Pack of 20)
Aantal stuks
143 kHz - - - - - 550 mA - Current 1 10ns Surface Mount SOT-223 20ns
RS-stocknr. 145-2888
FabrikantnummerNCP1337PG
FabrikantON Semiconductor
€ 0,745
Each (In a Tube of 50)
Aantal stuks
130 kHz - - - - 20 V 500 mA - Current 1 20ns Through Hole PDIP 50ns