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.

...
Lees meer Lees minder

Filters

1 - 20 van 90 producten worden weergegeven
Resultaten per pagina
Omschrijving Prijs 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-stocknr. 168-5905
FabrikantnummerL4960
2,952 €
Each (In a Tube of 50)
Aantal stuks
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 7 HEPTAWATT V Yes 50 mV
RS-stocknr. 127-0676
FabrikantnummerL4960
3,47 €
Each
Aantal stuks
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 7 HEPTAWATT V Yes 50 mV
RS-stocknr. 379-921
FabrikantnummerL5970D
2,366 €
Each (In a Pack of 5)
Aantal stuks
1A 35 V Buck Controller 1.2 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV
RS-stocknr. 145-8601
FabrikantnummerL5970D
1,407 €
Each (In a Tube of 100)
Aantal stuks
1A 35 V Buck Controller 1.2 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV
RS-stocknr. 178-1391
FabrikantnummerL296P
5,816 €
Each (In a Tube of 25)
Aantal stuks
4A 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 50 mV
RS-stocknr. 127-0660
FabrikantnummerL296P
6,75 €
Each
Aantal stuks
4A 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 50 mV
RS-stocknr. 686-8225
FabrikantnummerL6902D
2,54 €
Each
Aantal stuks
1A 34 V Buck Controller 1.235 V 8 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV
RS-stocknr. 168-6458
FabrikantnummerL4971D
2,578 €
Each (In a Tube of 49)
Aantal stuks
1.5A 50 V Buck Controller 3.3 V 8 V 55 V Adjustable Surface Mount - 1 16 SOIC W Yes 10 mV
RS-stocknr. 168-6454
FabrikantnummerL6902D
1,769 €
Each (In a Tube of 100)
Aantal stuks
1A 34 V Buck Controller 1.235 V 8 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV
RS-stocknr. 165-5532
FabrikantnummerST1S03PUR
0,548 €
Each (On a Reel of 3000)
Aantal stuks
- - - - 3 V 16 V Adjustable Surface Mount - - 6 DFN - 0.06 %
RS-stocknr. 686-8271
FabrikantnummerL4971D
3,05 €
Each
Aantal stuks
1.5A 50 V Buck Controller 3.3 V 8 V 55 V Adjustable Surface Mount - 1 16 SOIC W Yes 10 mV
RS-stocknr. 877-2848
FabrikantnummerST1S03PUR
1,132 €
Each (In a Pack of 10)
Aantal stuks
- - - - 3 V 16 V Adjustable Surface Mount - - 6 DFN - 0.06 %
RS-stocknr. 265-623
FabrikantnummerL4974A
10,13 €
Each
Aantal stuks
3.5A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 20 PDIP Yes 30 mV
RS-stocknr. 168-5780
FabrikantnummerL4974A
9,154 €
Each (In a Tube of 20)
Aantal stuks
3.5A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 20 PDIP Yes 30 mV
RS-stocknr. 103-2122
FabrikantnummerST1S10PUR
0,724 €
Each (On a Reel of 4500)
Aantal stuks
3A 5 V Buck Controller 0.8 V 2.5 V 18 V Adjustable Surface Mount - 1 8 DFN Yes 0.4 %
RS-stocknr. 168-5786
FabrikantnummerL4973D3.3
3,369 €
Each (In a Tube of 40)
Aantal stuks
3.5A - Buck Controller - 8 V 55 V Adjustable Surface Mount - 1 20 SOIC Yes 10 mV
Nieuw
RS-stocknr. 218-4840
FabrikantnummerST1PS02AQTR
0,665 €
Each (On a Reel of 3000)
Aantal stuks
400mA 3.3 V Step Down -0.3 V 1.8 V - Selectable - - 2 12 TQFN12 - -
RS-stocknr. 380-034
FabrikantnummerL5973D
2,49 €
Each (In a Pack of 5)
Aantal stuks
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS-stocknr. 380-038
FabrikantnummerL5973AD
2,416 €
Each (In a Pack of 5)
Aantal stuks
- 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
Nieuw
RS-stocknr. 216-7844
FabrikantnummerALED6000PHTR
3,725 €
Each (In a Pack of 2)
Aantal stuks
3A - - - 4.5 V - Adjustable - - 1 16 HTSSOP16 - -