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. 166-1619
Mfr. Part No.FAN7602CMX
MYR1.258
Each (On a Reel of 2500)
units
73 kHz - - - - 2.5 V 450 mA - Current 1 150ns Surface Mount SOP 150ns
RS Stock No. 121-7953
Mfr. Part No.NCP1236BD65R2G
MYR1.522
Each (On a Reel of 2500)
units
70 kHz - - - - - - - Current 1 70ns Surface Mount SOIC 70ns
RS Stock No. 168-6829
Mfr. Part No.UC2845BN
MYR3.16
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 178-4732
Mfr. Part No.UC3844BNG
MYR2.04
Each (In a Tube of 50)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 162-9678
Mfr. Part No.UC3844BDR2G
MYR0.859
Each (On a Reel of 2500)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 714-1149
Mfr. Part No.UC2845BN
MYR2.692
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 121-8954
Mfr. Part No.UC3525AN
MYR8.263
Each (In a Tube of 25)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 821-5168
Mfr. Part No.NCP1236BD65R2G
MYR2.651
Each (In a Pack of 20)
units
70 kHz - - - - - - - Current 1 70ns Surface Mount SOIC 70ns
RS Stock No. 786-6677
Mfr. Part No.UC3844BDR2G
MYR1.719
Each (In a Pack of 10)
units
250 kHz - - - - 5.1 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 516-5168
Mfr. Part No.UC3844BNG
MYR2.19
Each
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 620-0543
Mfr. Part No.UC3525AN
MYR11.036
Each (In a Pack of 5)
units
400 kHz - - - - - 400 mA - Voltage 2 50ns Through Hole PDIP 100ns
RS Stock No. 168-7315
Mfr. Part No.UC2845BD1
MYR1.969
Each (In a Tube of 100)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 714-7838
Mfr. Part No.UC2845BD1
MYR2.50
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Surface Mount SOIC 50ns
RS Stock No. 786-6614
Mfr. Part No.UC2842BDG
MYR2.41
Each (In a Pack of 5)
units
250 kHz - - - - 5.05 V 1 A - Current 1 150ns Surface Mount SOIC 150ns
RS Stock No. 178-9135
Mfr. Part No.SG3524D
MYR3.557
Each (In a Tube of 40)
units
450 kHz - - - - - 100 mA - - - - Surface Mount SOIC -
RS Stock No. 145-4652
Mfr. Part No.KA7552A
MYR2.668
Each (In a Tube of 50)
units
600 kHz 15mA -5µA 65µA 1.8 mA - - - - - - Through Hole PDIP -
RS Stock No. 517-2150
Mfr. Part No.SG3524D
MYR5.25
Each (In a Pack of 5)
units
450 kHz - - - - - 100 (Max) mA - - - - Surface Mount SOIC -
RS Stock No. 686-5033
Mfr. Part No.UC3842BN
MYR2.129
Each (In a Pack of 10)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns
RS Stock No. 145-6183
Mfr. Part No.UC2524AN
MYR8.34
Each (In a Tube of 25)
units
- - - - - 60 V 200 mA - Voltage 2 - Through Hole PDIP -
RS Stock No. 660-8023
Mfr. Part No.UC2844N
MYR6.014
Each (In a Pack of 5)
units
500 kHz - - - - - 1 A - Current 1 50ns Through Hole PDIP 50ns