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. 795-8473
Mfr. Part No.UC2843BD1
SGD1.289
Each (In a Pack of 10)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 168-7249
Mfr. Part No.UC2843BD1
SGD0.815
Each (In a Tube of 100)
units
500 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 168-6830
Mfr. Part No.UC3845BN
SGD1.048
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 714-1155
Mfr. Part No.UC3845BN
SGD1.113
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-6829
Mfr. Part No.UC2845BN
SGD1.197
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 880-5364
Mfr. Part No.SG3525AN
SGD2.062
Each (In a Pack of 10)
units
400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 714-1149
Mfr. Part No.UC2845BN
SGD1.251
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 168-8921
Mfr. Part No.SG3525AN
SGD2.06
Each (In a Tube of 25)
units
400 kHz - - - - 5 to 5.2 V 50 mA, 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 714-1004
Mfr. Part No.SG3525AP
SGD2.69
Each (In a Pack of 2)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 426-263
Mfr. Part No.VIPER22ADIP-E
SGD1.616
Each (In a Pack of 5)
units
60 kHz - - - - 730 V - - Current - 100ns Through Hole PDIP 50ns
RS Stock No. 380-044
Mfr. Part No.L5991D
SGD3.412
Each (In a Pack of 5)
units
1000 kHz - - - - - 1.5 A - Current 1 35ns Surface Mount SOIC 70ns
RS Stock No. 145-8579
Mfr. Part No.SG3524N
SGD2.132
Each (In a Tube of 25)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 168-8876
Mfr. Part No.SG2525AN
SGD1.869
Each (In a Tube of 25)
units
400 kHz 80µA 400mA 400mA 20 mA 5.05 to 5.15 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 168-6816
Mfr. Part No.SG3525AP
SGD2.274
Each (In a Tube of 50)
units
- - - - - - 500 mA - Voltage 2 50ns Surface Mount SOIC 100ns
RS Stock No. 178-1412
Mfr. Part No.L5991D
SGD2.68
Each (In a Tube of 50)
units
1000 kHz - - - - - 1.5 A - Current 1 35ns Surface Mount SOIC 70ns
RS Stock No. 920-8874
Mfr. Part No.VIPER22ADIP-E
SGD1.302
Each (In a Tube of 50)
units
60 kHz - - - - 730 V - - Current - 100ns Through Hole PDIP 50ns
RS Stock No. 877-2826
Mfr. Part No.SG2525AN
SGD1.869
Each (In a Pack of 10)
units
400 kHz 80µA 400mA 400mA 20 mA 5.05 to 5.15 V 500 mA - - 2 - Through Hole PDIP -
RS Stock No. 633-789
Mfr. Part No.SG3524N
SGD2.50
Each
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Through Hole PDIP 200ns
RS Stock No. 714-7850
Mfr. Part No.SG3524P
SGD2.43
Each (In a Pack of 2)
units
300 kHz - - - - 18 V 100 mA - Voltage 2 100ns Surface Mount SOIC 200ns
RS Stock No. 175-1176
Mfr. Part No.STCH03TR
SGD0.954
Each (On a Reel of 2500)
units
196 kHz 0.9mA - - 2.9 mA 13 V - Yes - 1 - Surface Mount SO8 -