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SPX1581 데이터시트(HTML) 4 Page - Sipex Corporation

부품명 SPX1581
상세내용  5A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed
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제조사  SIPEX [Sipex Corporation]
홈페이지  http://www.sipex.com
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SPX1581 데이터시트(HTML) 4 Page - Sipex Corporation

   
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Date 5/25/04
SPX1581 5A Ultra Low Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
Adjustable Regulator Design
1.25V reference voltage is being developed be-
tween the SENSE pin and the ADJ pin of the
SPX1581. Adding two external resistors (see fig
1.) will allow setting the output voltage from
1.25V to 6V. R1 is chosen so that this current is
specified minimum load current of 10mA. R2 is
given by the formula: VOUT = VREF (1+ R2/R1)
+ IADJ (R2). The current flowing from the ADJ
pin is typicaly 50
µA. This ADJ pin contributes
to the final VOUT but is usually neglected.
Connecting the sense pin to the top of the resis-
tor divider will improve load regualtion.
Lowering Noise
Using the SENSE pin to Kelvin the load will
increase accuracy of the output voltage during
load regulation. For the fixed voltage device,
adding a capacitor at the GND pin will improve
transient response. This capacitor is chosen in
the range of 1
µF to 0.1µF and will depend on the
amount of output capacitance in the system.
APPLICATION NOTES: Continued


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