AS2830 데이터 시트보기 (PDF) - Signal Processing Technologies

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AS2830

3A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response

Signal Processing Technologies 

AS2830

Basic Adjustable Regulator

VIN

AS2830

VOUT

VREF

R1

IADJ

50µA

R2

VOUT = VREF * ( 1 + R2/R1) + IADJ * R2

VIN

5V

C1

10uF

AS2830

VOUT

3.3V

C2

10uF

Basic Fixed Regulator

Fig.2 Basic Adjustable Regulator

Output Voltage

Consider Figure 2. The resistance R1 generates a constant

current flow, normally the specified load current of 10mA.

This current will go through the resistance R2 to set the overall

output voltage. The current IADJ is very small and constant.

Therefore its contribution to the overall output voltage is very

small and can generally be ignored.

Load Regulation

Parasitic line resistance can degrade load regulation. In order

not to affect the behavior of the regulator, it is best to connect

directly the R1 resistance from the resistor divider to the case,

and not to the load. For the same reason, it is best to connect

the resistor R2 to the Negative side of the load.

Output Voltage

The fixed voltage LDO voltage regulators are simple to use

regulators since the VOUT is preset to the specifications. It is

important however, to provide the proper output capacitance

for stability and improvement. For most operating conditions

a capacitance of 22uF tantalum or 100uF electrolytic will

ensure stability and prevent oscillation.

RP Parasitic Line

VIN

AS2830

Resistance

Connect R1 to

Case of Regulator

R1

RL

R2

Connect R2 to Load

Fig.3 Basic Adjustable Regulator

Rev. 10/2/00

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