Description

The GM7800 series are classic regulators, which are use-

ful in a wide range of applications. For example, you can

use them for local on-card regulation to eliminate the distri-

bution and problems associated with single point regula-

tion.

The wide range of output voltages (5V to 27V) make them

useful in an endless list of applications. Although designed

as fixed voltage regulators, you can add a few external

components to make adjustable voltages and currents.

Current limiting prevents the peak output current to a safe

value. Safe-area protection of the output transistor limits in-

ternal power dissipation. If internal power dissipation be-

comes too high for the heat sinking provided, the thermal

shutdown circuit activates to prevent the regulator from

overheating. These versatile workhorses are easy to use.

You do not need to bypass the output, although this does

improve transient response. Input bypass is needed only if

you place the regulator far from the filter capacitor of the

power supply.

The GM7800 series is available in TO-220, TO-252 and

TO-263 packages.

Features

Output current up to 1.5A

Output Voltages 5V, 6V, 8V, 8.5V, 9V, 10V,

12V, 15V, 18V, 20V, 24V and 27V

3- Terminal Regulators

Internal Thermal Overload Protection

Internal Short-Circuit Current Limiting

Output Transistor Safe-Area Protection

TO-220, TO-252 and TO-263 Packages

High Power Dissipation Capability

Direct replacements for LM78xx

TYPIC APPLICATION CIRCUITS

www.gammamicro.com

1

Application

Post-Regulator Switching DC/DC

Converters

Bias Supply for Analog Circuits

Instrumentation and Audio Systems

Logic Systems

Others too numerous to mention

GM7800

0.1µF

0.33µF

GND

1.5A

For a positive regulator, a 0.33µF bypass capacitor should be used on the input terminals.

While not necessary for stability, an output capacitor of 0.1µF may be used to improve the

transient response of the regulator. These capacitors should be on or as near as possible

to the regulator terminals .