Logga in / Registrera dig för att få tillgång till dina förmåner
Senaste sökningar

    Buck Converters

    A Buck Converter, also known as a Step-Down Converter, is a DC-to-DC power converter that steps down the voltage from its input to its output. A buck converter integrates the core components and circuitry needed into a single device.

    Buck converters are found in countless electronic applications, where their power regulation properties are a vital component.

    How does a Buck Converter work?

    A Buck Converter is a type of switch-mode power supply, a class of device that incorporates a switch (e.g. typically a MOSFET) to rapidly turn the circuit on and off. This rapid switching creates a square wave. If the duty cycle of the switch is set to 50%, i.e. the switch is on 50% of the time, the average voltage will be 50% of the input.

    The square wave needs to be smoothed to provide useful power, typically an inductor and capacitor are used in series to fulfil this function. This combination is called an LC low pass filter. The properties of an inductor smooth the current flow, while the capacitor resists sudden changes in voltage. The combined effect produces a relatively smooth voltage output with low ripple. For example, if the input voltage is 10V and the switch employs a duty cycle of 50%, the output voltage will be 5V.

    A further necessary component of a Buck Converter is to incorporate a diode or other switch in parallel with the inductor. This is to compensate for the property of an inductor, in that the current in an inductor cannot instantly change, protecting the switching transistor from being overloaded and destroyed.

    Buck Converters also incorporate additional circuitry to ensure a stable output voltage. The converter uses a closed-loop control scheme with negative feedback to monitor the voltage output and dynamically adjusts the duty cycle of the switch to regulate the output voltage.

    Design considerations

    • Buck Converters are very efficient, with some devices offering efficiencies of above 95%.
    • Buck Converters can be more cost-effective than linear regulators at higher power levels, the cost of removing the heat generated by a linear regulator may be less than employing a Buck Converter.
    • The output of a Buck Converter will feature a noise, meaning the more stable output of a linear voltage regulator is better suited for application requiring low output noise.
    • Linear regulators can respond faster to input and output changes versus a buck converter.

    1146 Produkter som visas för Buck Converters

    Var (i en rulle med 500)
    9,354 kr
    Monolithic Power Systems (MPS)
    Switching Regulator
    500mA
    -
    Step Down
    0.81 V
    4.5 V
    55 V
    Adjustable
    Surface Mount
    -
    1
    580 kHz
    6
    TSOT-23
    -
    -
    Varje
    71,23 kr
    Texas Instruments
    Switching Regulator
    5A
    -
    Buck Controller, Inverting
    1.258 V
    4.5 V
    42 V
    Adjustable
    Surface Mount
    -
    1
    500 kHz
    7
    D2PAK (TO-263)
    -
    -
    Var (i en rulle med 3000)
    10,497 kr
    STMicroelectronics
    -
    400mA
    3.3 V
    Step Down
    -0.3 V
    1.8 V
    -
    Selectable
    -
    -
    2
    -
    12
    TQFN12
    -
    -
    Var (i en rulle med 3000)
    10,497 kr
    STMicroelectronics
    -
    400mA
    3.3 V
    Step Down
    -0.3 V
    1.8 V
    -
    Selectable
    -
    -
    2
    -
    12
    TQFN12
    -
    -
    Var (i ett rör med 100)
    19,742 kr
    STMicroelectronics
    Switching Regulator
    1A
    34 V
    Buck Controller
    1.235 V
    8 V
    36 V
    Adjustable
    Surface Mount
    -
    1
    275 kHz
    8
    SOIC
    10 mV
    15 mV
    Var (i ett paket med 5)
    20,644 kr
    onsemi
    Switching Regulator
    3A
    37 V
    Buck Controller
    1.23 V
    -
    40 V
    Adjustable
    Surface Mount
    -
    1
    52 kHz
    5
    D2PAK
    -
    -
    • RS-artikelnummer 252-0683
    • Tillv. art.nr LM5176RHFT
    Varje
    85,57 kr
    Texas Instruments
    -
    -
    55 V
    Boost/Buck Controller
    0.8 V
    4.2 V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Var (i en rulle med 500)
    34,439 kr
    Texas Instruments
    -
    3A
    37 V
    -
    1.2 V
    8 V
    -
    Adjustable
    -
    -
    1
    -
    7
    TO-263-7
    -
    -
    Var (i ett paket med 10)
    21,869 kr
    onsemi
    Switching Regulator
    3A
    5.25 V
    Buck Controller
    4.75 V
    8 V
    40 V
    Adjustable
    Surface Mount
    -
    1
    63 kHz
    5
    D2PAK
    -
    -
    Var (i ett rör med 95)
    29,079 kr
    Texas Instruments
    Switching Regulator
    500mA
    -
    Buck Controller
    -
    8 V
    40 V
    Fixed
    Surface Mount
    -
    1
    260 kHz
    8
    SOIC
    -
    -
    Var (i en rulle med 500)
    23,815 kr
    Monolithic Power Systems (MPS)
    Switching Regulator
    3A
    -
    Step Down
    0.8 V
    4 V
    30 V
    Adjustable
    Surface Mount
    -
    1
    500 kHz
    8
    QFN
    -
    4 %
    • RS-artikelnummer 256-1663
    • Tillv. art.nr ISL85003AFRZ-T7A
    Var (i ett paket med 5)
    12,454 kr
    Renesas Electronics
    -
    50mA
    5.5 V
    Buck
    4.3 V
    4.5 V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Varje
    63,28 kr
    Texas Instruments
    Switching Regulator
    1A
    37 V
    Buck Controller
    1.21 V
    8 V
    40 V
    Adjustable
    Through Hole
    -
    1
    260 kHz
    8
    MDIP
    -
    -
    • RS-artikelnummer 244-8639
    • Tillv. art.nr NJW4152R-B-TE2
    Var (i ett paket med 2)
    22,455 kr
    Nisshinbo Micro Devices
    -
    600mA
    40 V
    Buck
    0.8 V
    4.6 V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Varje
    20,88 kr
    STMicroelectronics
    Switching Regulator
    1A
    -
    Buck Controller
    -
    4.4 V
    36 V
    Adjustable
    Surface Mount
    -
    1
    275 kHz
    8
    SO
    10 mV
    15 mV
    Var (i ett paket med 2)
    79,24 kr
    Texas Instruments
    -
    2A
    1.28 V
    Step Down
    1.18 V
    4.5 V
    -
    Adjustable
    -
    -
    1
    -
    5
    DDPAK, TO-263
    -
    -
    Varje
    74,03 kr
    Texas Instruments
    Switching Regulator
    5A
    37 V
    Buck Controller
    1.2 V
    8 V
    40 V
    Adjustable
    Surface Mount
    -
    1
    260 kHz
    7
    D2PAK (TO-263)
    -
    -
    Var (i ett rör med 75)
    14,951 kr
    Texas Instruments
    Switching Regulator
    3.5A
    -
    Buck Controller
    0.8 V
    3.5 V
    28 V
    Adjustable
    Surface Mount
    -
    1
    1200 kHz
    8
    SOIC
    -
    -
    Var (i ett rör med 50)
    15,437 kr
    onsemi
    Switching Regulator
    500mA
    37 V
    Buck Controller, Inverting
    1.23 V
    4.75 V
    40 V
    Adjustable
    Through Hole
    -
    1
    52 kHz
    8
    PDIP
    -
    -
    Varje
    20,16 kr
    Texas Instruments
    Switching Regulator
    3A
    -
    Buck Controller
    0.8 V
    3.5 V
    28 V
    Adjustable
    Surface Mount
    -
    1
    684 kHz
    8
    SOIC
    -
    -
    Resultat per sida