SPX2810 데이터 시트보기 (PDF) - Signal Processing Technologies

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SPX2810

1A Low Dropout Positive Linear Regulator

Signal Processing Technologies 

Ripple Rejection

Ripple rejection can be improved by adding a

capacitor between the ADJ pin and ground as

shown in Figure 6. When ADJ pin bypassing is

used, the value of the output capacitor required

increases to its maximum. If the ADJ pin is not

bypassed, the value of the output capacitor can

be lowered to 10(F for an electrolytic aluminum

capacitor or 2.2µF for a solid tantalum capacitor

(Fig 10). However the value of the ADJ-bypass

capacitor should be chosen with respectto the

following equation:

C = 1 / ( 6.28 * FR * R1 )

Where C = value of the capacitor in Farads

(select an equal or larger standard value),

FR= ripple frequency in Hz,

R1= value of resistor R1 in Ohms

If an ADJ-bypass capacitor is used, the

amplitude of the output ripple will be inde-

pendent of the output voltage. If an ADJ-

bypass capacitor is not used, the output ripple

will be proportional to the ratio of the output

voltage to the reference

voltage:

M=V /V

OUT

REF

Where M = multiplier for the ripple seen when

the ADJ pin

is optimally bypassed.

VREF =1.25V

PC BOARD

AREA mm2

2500

2500

2500

2500

2500

1600

2500

2500

1600

900

900

TOPSIDE COPPER BACKSIDE COPPER

AREA mm2

AREA mm2

2500

1250

950

2500

1800

600

1250

915

600

240

240

2500

2500

2500

0

0

1600

0

0

0

900

0

THERMAL RESISTANCE

JUNCTION TO AMBIENT

°C/W

46

47

49

51

53

55

58

59

67

72

85

TYPICAL APPLICATION CIRCUITS

V IN

IN

4.7µF + C 1

SPX2810

ADJ

IOUT =

VREF

R1

OUT

C2

R1

IOUT

LOAD

VIN

IN

4.7µF + C1

SPX2810

ADJ

I ADJ

50µA

VOUT = V REF (1+R 2 /R1) +I ADJ R 2

OUT

VREF R1

VOUT

C2

R2

Figure 8. 600mA Current Source

Date: 5/25/04

Figure 9. Typical Adjustable Regulator

SPX2810 1A Low Dropout Linear Regulator

5

© Copyright 2004 Sipex Corporation

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