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.

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กำลังดูสินค้า 1 - 9 รายการจาก 9 รายการ / Viewing 1 - 9 of 9 products
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รายละเอียดสินค้า / Description ราคา / Price Maximum Output Current Maximum Output Voltage Regulator Function Minimum Output Voltage Minimum Input Voltage Maximum Input Voltage Output Type Mounting Type Series Number of Outputs Pin Count Package Type Switching Regulator Line Regulation
RS Stock No. 146-5626
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK304PN
THB23.846
Each (In a Tube of 50)
Units
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 146-5618
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK302PN
THB21.336
Each (In a Tube of 50)
Units
80mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 146-5652
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK306PN
THB38.514
Each (In a Tube of 50)
Units
360mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 146-5628
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK304GN
THB25.862
Each (In a Tube of 50)
Units
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS Stock No. 146-5633
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK305PN
THB28.235
Each (In a Tube of 50)
Units
280mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 146-5673
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TNY267GN
THB53.34
Each (In a Tube of 50)
Units
- - Buck - 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDC - -
RS Stock No. 146-5659
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK306GN
THB35.691
Each (In a Tube of 50)
Units
360mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS Stock No. 146-5637
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK305GN
THB35.049
Each (In a Tube of 50)
Units
280mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS Stock No. 146-5623
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LNK302GN
THB22.586
Each (In a Tube of 50)
Units
80mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -