APL78L05-DC-PBL Просмотр технического описания (PDF) - Anpec Electronics

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APL78L05-DC-PBL

Three-Terminal Low Current Positive Voltage Regulator

Anpec Electronics 

APL78L05/12

Typical Characteristics

The APL78L05/12 Series of fixed voltage regulators

are designed with Thermal Overload Protection that

shuts down the circuit when subjected to an exces-

sive power overload condition. Internal Short Circuit

Protection limits the maximum current the circuit will

pass.

In many low current applications, compensation ca-

pacitors are not required. However, it is recom-

mended that the regulator input be bypassed with a

capacitor if the regulator is connected to the power

supply filter with long wire lengths, or if the output

load capacitance is large. The input bypass capaci-

tor should be selected to provide good high-frequency

characteristics to insure stable operation under all

load conditions. A 0.33µF or larger tantalum, mylar,

or other capacitor having low internal impedance at

high frequencies should be chosen. The bypass ca-

pacitor should be mounted with the shortest possible

leads directly across the regulators input terminals.

Good construction techniques should be used to mini-

mize ground loops and lead resistance drops since

the regulator has no external sense lead. Bypassing

the output is also recommended.

Figure 1. Current Regulator

Input

0.33µF

APL78L05

R

lO

Constant

Current to

Grounded

Load

The APL78L00 regulators can also be used as a cur-

rent source when connected as above. In order to

minimize dissipation the APL78L05 is chosen in this

application. Resistor R determines the current as

follows :

IO =

5.0V

R

+

IB

IB =3.8mA over line and load changes

For example, a 100mA current source would require

R to be a 50Ω, 1/2W resistor and the output voltage

compliance would be the input voltage less 7V.

Figure 2. ±15V Tracking Voltage Regulator

+20V

APL78L15

0.33µF

7

2

6 MC1741

3

4

0.33µF

20V

6.5

MPSU55

MPSA70

+VO

10K

10K

-VO

Figure 3. Positive and Negative Regulator

+VI

0.33µF

-VI

0.33µF

APL78LXX

APL79LXX

+VO

0.1µ F

0.1µ F

-VO

Copyright  ANPEC Electronics Corp.

7

Rev. A.4 - Oct., 2003

www.anpec.com.tw

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