TLH7755

January 1995

LM105LM205LM305LM305A

LM376 Voltage Regulators

General Description

The LM105 series are positive voltage regulators similar to

the LM100 except that an extra gain stage has been added

for improved regulation A redesign of the biasing circuitry

removes any minimum load current requirement and at the

same time reduces standby current drain permitting higher

voltage operation They are direct plug-in replacements for

the LM100 in both linear and switching regulator circuits

with output voltages greater than 45V Important character-

istics of the circuits are

Y

Output voltage adjustable from 45V to 40V

Y

Output currents in excess of 10A possible by adding

external transistors

Y

Load regulation better than 01% full load with current

limiting

Y

DC line regulation guaranteed at 003%V

Y

Ripple rejection on 001%V

Y

45 mA output current without external pass transistor

(LM305A)

Like the LM100 they also feature fast response to both load

and line transients freedom from oscillations with varying

resistive and reactive loads and the ability to start reliably on

any load within rating The circuits are built on a single sili-

con chip and are supplied in a TO-99 metal can

a

70 C

Schematic and Connection Diagrams

TLH7755 – 1

Metal Can Package

TLH7755 – 3

Top View

Order Number LM105H LM105H883

SMD

5962-8958801 LM305H or LM305AH

See NS Package Number H08C

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A