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.

...
Voir plus Voir moins

Filtres

Afficher 1 - 20 des 1243 produits
Nombre de résultats par page
Description Prix 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
N° de stock RS 146-5628
Référence fabricantLNK304GN
0,675 €
Each (In a Tube of 50)
Unité
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
N° de stock RS 146-5626
Référence fabricantLNK304PN
0,676 €
Each (In a Tube of 50)
Unité
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
N° de stock RS 146-5637
Référence fabricantLNK305GN
0,803 €
Each (In a Tube of 50)
Unité
280mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
N° de stock RS 533-4011
Référence fabricantLM2671M-5.0/NOPB
3,57 €
Each
Unité
500mA - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
N° de stock RS 920-3627
Référence fabricantLM2671M-5.0/NOPB
3,023 €
Each (In a Tube of 95)
Unité
500mA - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
N° de stock RS 146-5633
Référence fabricantLNK305PN
0,777 €
Each (In a Tube of 50)
Unité
280mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
N° de stock RS 779-9384
Référence fabricantLT1676CS8#PBF
5,515 €
Each (In a Pack of 2)
Unité
1A 30 V Buck Controller 5 V 7.4 V 60 V - Surface Mount - 1 8 SOIC Yes 0.01 %/V
N° de stock RS 921-2772
Référence fabricantLMZ31710RVQT
8,76 €
Each (In a Tube of 250)
Unité
10A 5.5 V Buck Controller 0.6 V 2.95 V 17 V Adjustable Surface Mount - 1 42 BQFN Yes ±0.1 %
N° de stock RS 620-0868
Référence fabricantDCP010505DBP-U
7,49 €
Each
Unité
100mA ±5.75 V Buck Controller ±4.25 V 4.5 V 5.5 V Fixed Surface Mount - 2 7 SOP Yes 15 %
N° de stock RS 537-9547
Référence fabricantLM3671MF-ADJ/NOPB
1,21 €
Each
Unité
600mA 3.3 V Buck Controller 1.1 V 2.7 V 5.5 V Adjustable Surface Mount - 1 5 SOT-23 Yes 0.031 %/V
N° de stock RS 162-4721
Référence fabricantLM3671MF-ADJ/NOPB
0,517 €
Each (On a Reel of 1000)
Unité
600mA 3.3 V Buck Controller 1.1 V 2.7 V 5.5 V Adjustable Surface Mount - 1 5 SOT-23 Yes 0.031 %/V
N° de stock RS 145-7114
Référence fabricantDCP010505DBP-U
6,89 €
Each (In a Tube of 25)
Unité
100mA ±5.75 V Buck Controller ±4.25 V 4.5 V 5.5 V Fixed Surface Mount - 2 7 SOP Yes 15 %
N° de stock RS 798-1293
Référence fabricantLMZ31710RVQT
8,76 €
Each
Unité
10A 5.5 V Buck Controller 0.6 V 2.95 V 17 V Adjustable Surface Mount - 1 42 BQFN Yes ±0.1 %
N° de stock RS 533-3226
Référence fabricantLM2576S-5.0/NOPB
2,89 €
Each
Unité
3A - Buck Controller, Inverting - 4 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 900-9851
Référence fabricantTPS563209DDCT
0,872 €
Each (In a Pack of 5)
Unité
3A 7 V Synchronous Step Down 0.76 V 4.5 V 17 V Adjustable Surface Mount - 1 6 SOT-23 Yes -
N° de stock RS 100-3975
Référence fabricantLM2574N-5.0/NOPB
2,095 €
Each (In a Tube of 40)
Unité
500mA - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 8 MDIP Yes -
N° de stock RS 127-0676
Référence fabricantL4960
3,15 €
Each
Unité
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 7 HEPTAWATT V Yes 50 mV
N° de stock RS 812-3729
Référence fabricantTPS62175DQCT
1,141 €
Each (In a Pack of 10)
Unité
500mA 6 V - 1 V 4.75 V 28 V Adjustable Surface Mount - 1 10 WSON Yes 0.015 %/V
N° de stock RS 506-0580
Référence fabricantLT1934ES6#TRMPBF
4,87 €
Each
Unité
300mA - Buck Controller - 3.2 V 34 V Fixed Surface Mount - 1 6 TSOT-23 Yes 0.007 %/V
N° de stock RS 920-3510
Référence fabricantLM2576S-5.0/NOPB
2,446 €
Each (In a Tube of 45)
Unité
3A - Buck Controller, Inverting - 4 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -