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. 877-9120
Mfr. Part No.ADP2301AUJZ-R2
€2.742
Each (In a Pack of 5)
units
1.75 MHz - - - - 0.8 to 17 V 1.2 A - - 1 - Surface Mount TSOT -
RS Stock No. 661-5881
Mfr. Part No.UCC38084P
€3.98
Each
units
1000 kHz - - - - - 1 A - Current 2 25ns Through Hole PDIP 25ns
RS Stock No. 197-7630
Mfr. Part No.UCC3895DW
€5.45
Each
units
500 KHz 0.25mA -0.03mA 0.375mA 30 mA - - - - - - - SOIC -
RS Stock No. 527-328
Mfr. Part No.UC3845AD8
€1.366
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 196-1969
Mfr. Part No.LM334DT
€0.859
Each (In a Pack of 10)
units
- - - - - - - - Current - - Surface Mount SO -
RS Stock No. 862-9375
Mfr. Part No.KA7552A
€0.729
Each (In a Pack of 10)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 714-7850
Mfr. Part No.SG3524P
€1.55
Each (In a Pack of 2)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS Stock No. 168-7315
Mfr. Part No.UC2845BD1
€0.473
Each (In a Tube of 100)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 912-9885
Mfr. Part No.ADP2303ARDZ-5.0-R7
€1.58
Each (On a Reel of 1000)
units
700 kHz - - - - 5 V 3 A - Current 1 280ns Surface Mount SOIC 170ns
RS Stock No. 184-1568
Mfr. Part No.UC2845BD1G
€12.89
1 Pack of 20
Pack(s)
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Through Hole SOIC 150ns
RS Stock No. 462-1083
Mfr. Part No.TL1451ACD
€2.004
Each (In a Pack of 5)
units
- - - - - - - - - - - Surface Mount SOIC -
New
RS Stock No. 214-9136
Mfr. Part No.MAX15004DAUE/V+
€1.019
Each (In a Tube of 96)
units
500 kHz - - - - 7.4 V 45 mA - - - - - TSSOP -
RS Stock No. 145-4209
Mfr. Part No.UC3842BD1G
€0.565
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. 170-8156
Mfr. Part No.ISL68134IRAZ-T7A
BrandIntersil
€6.363
Each (On a Reel of 250)
units
1000 kHz - - - 63 mA 3.05 V 240 A - - 2 - Surface Mount TQFN -
RS Stock No. 179-2109
Mfr. Part No.UCC3801N
€3.34
Each (In a Tube of 50)
units
1000 kHz - - - - - 1 A - Current - 44ns Through Hole PDIP 41ns
RS Stock No. 175-1177
Mfr. Part No.EVALKITSTKNX
€190.31
Each
units
16 MHz - - - - - - - - - - - - -
RS Stock No. 162-6069
Mfr. Part No.UCC2808AD-2
€3.00
Each (In a Tube of 75)
units
1000 kHz - - - - - 1 A - Current 2 25ns Surface Mount SOIC 25ns
RS Stock No. 145-7322
Mfr. Part No.UCC28C44D
€1.493
Each (In a Tube of 75)
units
1000 kHz - - - - 18 V 200 mA - Current 1 20ns Surface Mount SOIC 25ns
RS Stock No. 178-4345
Mfr. Part No.NCP1239KD65R2G
€0.218
Each (On a Reel of 2500)
units
65 kHz - - - - 16 V 500 mA - Current 1 30ns Surface Mount SOIC 40ns
RS Stock No. 170-3375
Mfr. Part No.NCP12510ASN65T1G
€0.188
Each (On a Reel of 3000)
units
65 kHz - - - - 8 to 14 V 300 mA - Current 1 30ns Surface Mount TSOP 40ns