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ZLDO330 Folha de dados(PDF) 6 Page - Zetex Semiconductors |
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ZLDO330 Folha de dados(HTML) 6 Page - Zetex Semiconductors |
6 / 9 page ZLDO330 1). Simple 3.3V Supply Using a circuit such as Figure 1, the ZLDO330 can easily provide a 3.3V logic supply from an available 5V rail where most standard regulators could not guarantee correct operation. Although this approach is not particularly energy efficient, if the load taken at 3.3V is not too large, then the added complexity and cost of a 3.3V switching converter may not be justifiable and so this linear solution can be preferable. This circuit will also give far less noise than a switching regulator which can be important when handling low level analogue signals or low voltage measurements. 2). Post Converter Regulation A common problem with multiple output switch mode converters is that only one output can be used in the feedback control loop of the switching regulator. Thus only one output is fully regulated. All other outputs are prone to tracking errors that occur if the load on any output changes significantly. By ensuring close coupling of all transformer windings and minimising the impedance of all outputs, these errors can be reduced but never eliminated. A simple way round this problem is to wind the switching regulator transformer to give a slightly higher voltage than required and regulate down from this to the desired voltage with a linear regulator. This is indicated in Figure 2. To keep losses low and so maintain the advantages of a switch mode supply, it is important that the voltage drop across this regulator is kept as low as possible, i.e. just high enough to compensate for the poor output impedance of the switching power supply but no higher. The low dropout voltage of the ZLDO330 allows this circuit technique to be implemented very effectively, giving a highly stable and accurate low noise supply. APPLICATIONS Spg D/C Vout LBF SC Vin N/C Gnd IC1 ZLDO330 C2 1uF C1 10pF C3 100nF +5V In +5V Out +3.3V Out 0V Out 0V In Figure 1 Spg D/C Vout LBF SC Vin N/C Gnd ZLDO330 C2 1uF C1 10pF + 5V Out 0V Out C4 220uF C5 220uF + 3.3V Out TR1 Feedback Switching Regulator Voltage D1 D2 Figure 2 4-67 |
Nº de peça semelhante - ZLDO330 |
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Descrição semelhante - ZLDO330 |
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