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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 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

    491 產品顯示為 PWM

    DiodesZetex
    -
    70 kHz
    -
    -
    -
    -
    -
    350 mA
    Current
    1
    100ns
    Surface Mount
    SOT-23
    250ns
    6
    -
    3.1 x 1.7 x 1.3mm
    80%
    3.1mm
    Current Mode
    1.7mm
    1.3mm
    Texas Instruments
    -
    700 kHz
    -
    -
    -
    -
    -
    1 A
    Voltage
    1
    20ns
    Surface Mount
    SOIC
    20ns
    14
    Boost, Buck, Flyback, Forward
    8.65 x 3.91 x 1.58mm
    100%
    8.65mm
    Voltage Mode
    3.91mm
    1.58mm
    STMicroelectronics
    -
    500 kHz
    -
    -
    -
    -
    -
    1 A
    Current
    1
    50ns
    Through Hole
    PDIP
    50ns
    8
    Boost, Flyback, Forward
    10.92 x 6.6 x 3.32mm
    100%
    10.92mm
    Current Mode
    6.6mm
    3.32mm
    STMicroelectronics
    -
    60 kHz
    -
    -
    -
    -
    730 V
    -
    Current
    -
    100ns
    Through Hole
    PDIP
    50ns
    8
    Forward
    10.16 x 7.11 x 4.95mm
    16%
    10.16mm
    Current Mode
    7.11mm
    4.95mm
    STMicroelectronics
    -
    -
    -
    -
    -
    -
    -
    -
    Current
    -
    -
    Surface Mount
    SO
    -
    8
    -
    5 x 4 x 1.5mm
    -
    5mm
    Current Mode
    4mm
    1.5mm
    Texas Instruments
    -
    500 kHz
    -
    -
    -
    -
    -
    1 A
    Current
    1
    50ns
    Through Hole
    PDIP
    50ns
    8
    Boost, Buck, Flyback, Forward
    9.81 x 6.35 x 4.57mm
    50%
    9.81mm
    Current Mode
    6.35mm
    4.57mm
    Texas Instruments
    -
    500 kHz
    -
    -
    -
    -
    -
    1 A
    Current
    1
    50ns
    Through Hole
    PDIP
    50ns
    8
    Boost, Flyback, Forward
    9.81 x 6.35 x 4.57mm
    50%
    9.81mm
    Current Mode
    6.35mm
    4.57mm
    Texas Instruments
    -
    500 kHz
    -
    -
    -
    -
    60 V
    200 mA
    Voltage
    2
    -
    Through Hole
    PDIP
    -
    16
    Boost, Buck, Flyback, Forward, Full Bridge, Half Bridge, Push-Pull
    19.3 x 6.35 x 4.57mm
    -
    19.3mm
    Current Mode
    6.35mm
    4.57mm
    Microchip
    -
    112 kHz
    -
    -
    -
    -
    65 V
    1.25 A
    Current
    1
    -
    Surface Mount
    SOIC
    -
    8
    Boost, Buck, Flyback, Forward
    4.93 x 3.94 x 1.48mm
    89%
    4.93mm
    Current Mode
    3.94mm
    1.48mm
    STMicroelectronics
    -
    300 kHz
    -
    -
    -
    -
    18 V
    100 mA
    Voltage
    2
    100ns
    Through Hole
    PDIP
    200ns
    16
    Push-Pull
    20 x 7.1 x 5.1mm
    45%
    20mm
    Voltage Mode
    7.1mm
    5.1mm
    STMicroelectronics
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Surface Mount
    SOIC
    -
    8
    -
    5 x 4 x 1.25mm
    -
    5mm
    Current Mode
    4mm
    1.25mm
    onsemi
    -
    500 kHz
    -
    -
    -
    -
    -
    1 A
    Current
    1
    50ns
    Through Hole
    PDIP
    50ns
    8
    Boost, Flyback, Forward
    10.16 x 6.6 x 3.44mm
    96%
    10.16mm
    Current Mode
    6.6mm
    3.44mm
    onsemi
    -
    275 kHz
    -
    -
    -
    -
    5.1 V
    1 A
    Current
    1
    150ns
    Surface Mount
    SOIC
    150ns
    8
    Boost, Flyback, Forward
    5 x 4 x 1.5mm
    96%
    5mm
    Current Mode
    4mm
    1.5mm
    onsemi
    -
    250 kHz
    -
    -
    -
    -
    5.1 V
    1 A
    Current
    1
    150ns
    Surface Mount
    SOIC
    150ns
    14
    Boost, Flyback
    8.75 x 4 x 1.5mm
    50%
    8.75mm
    Current Mode
    4mm
    1.5mm
    Renesas Electronics
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Surface Mount
    SOP
    -
    16
    -
    10.1 x 5.3 x 1.8mm
    -
    10.1mm
    Voltage Mode
    5.3mm
    1.8mm
    onsemi
    -
    32 kHz
    -
    -
    -
    -
    28 V
    500 mA
    Current
    1
    70ns
    Surface Mount
    SOIC
    70ns
    7
    Flyback
    5 x 4 x 1.5mm
    85%
    5mm
    Current Mode
    4mm
    1.5mm
    Texas Instruments
    -
    1000 kHz
    -
    -
    -
    -
    -
    1.5 A
    Current, Voltage
    2
    30ns
    Through Hole
    PDIP
    30ns
    16
    Boost, Buck, Flyback, Forward, Full Bridge, Half Bridge, Push-Pull
    19.3 x 6.35 x 4.57mm
    85%
    19.3mm
    Current Mode
    6.35mm
    4.57mm
    Texas Instruments
    -
    500 kHz
    -
    -
    -
    -
    -
    1 A
    Current
    1
    50ns
    Surface Mount
    SOIC
    50ns
    8
    Boost, Buck, Flyback, Forward
    4.9 x 3.91 x 1.58mm
    100%
    4.9mm
    Current Mode
    3.91mm
    1.58mm
    STMicroelectronics
    -
    500 kHz
    0.5mA
    -
    12mA
    17 mA
    5 V
    -
    -
    1
    -
    -
    SO8
    -
    8
    -
    -
    -
    -
    -
    -
    -
    Texas Instruments
    -
    500 kHz
    -
    -
    -
    -
    -
    500 mA
    Current
    2
    50ns
    Surface Mount
    SOIC
    50ns
    16
    Boost, Flyback, Forward, Full Bridge, Half Bridge, Push-Pull
    10.28 x 7.52 x 2.35mm
    50%
    10.28mm
    Current Mode
    7.52mm
    2.35mm
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