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GM7808 Schematic ( PDF Datasheet ) - Gamma Microelectronics

Teilenummer GM7808
Beschreibung POSITIVE VOLTAGE REGULATORS
Hersteller Gamma Microelectronics
Logo Gamma Microelectronics Logo 




Gesamt 12 Seiten
GM7808 Datasheet, Funktion
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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
Application
Post-Regulator Switching DC/DC
Converters
Bias Supply for Analog Circuits
Instrumentation and Audio Systems
Logic Systems
Others too numerous to mention
TYPIC APPLICATION CIRCUITS
VIN
0.33µF
GM7800
VOUT
1.5A
0.1µF
GND
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 .
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GM7808 Datasheet, Funktion
ELECTRICAL CHARACTERISTICS at specified Junction Temperature
GM7809: VI=16V, IO=500mA, (unless otherwise noted)
CHARACTERISTICS
TEST CONDITIONS *
Output Voltage **
Input Regulation
Ripple Rejection
Output Regulation
Output Resistance
Temperature Coefficient
Output Voltage
Output Noise Voltage
Dropout Voltage
Bias Current
Bias Current Change
Short-Circuit Output Current
Peak Output Current
IO= 5mA to 1A
VI=11.5V to 24V, P
VI=11.5V to 27V
15W
VI=13V to 19V
VI=12V to 22V, f = 120Hz
IO=5mA to 1.5A
IO=250mA to 750mA
f = 1kHz
IO= 5mA
f = 10Hz to 100kHz
IO= 1A
VI= 11.5V to 27V
IO=5mA to 1A
25°C
0°C to 125°C
25°C
0°C to 125°C
25°C
0°C to 125°C
0°C to 125°C
25°C
25°C
25°C
0°C to 125°C
25°C
25°C
MIN
8.65
8.55
55
TYP
9
9
7
2
70
12
4
0.018
-1.0
60
2.0
4.3
400
2.2
MAX UNIT
9.35
9.45
V
180
mV
90
dB
180
mV
90
W
mV/°C
µV
V
8 mA
1.0
mA
0.5
mA
A
GM7810: VI= 17V, IO= 500mA, (unless otherwise noted)
CHARACTERISTICS
Output Voltage **
Input Regulation
Ripple Rejection
Output Regulation
Output Resistance
Temperature Coefficient
Output Voltage
Output Noise Voltage
Dropout Voltage
Bias Current
Bias Current Change
Short-Circuit Output Current
Peak Output Current
TEST CONDITIONS *
IO= 5mA to 1A
VI=12.5V to 25V, P
VI=12.5V to 28V
15W
VI=14V to 20V
VI=13V to 23V, f = 120Hz
IO=5mA to 1.5A
IO=250mA to 750mA
f = 1kHz
25°C
0°C to 125°C
25°C
0°C to 125°C
25°C
0°C to 125°C
IO= 5mA
0°C to 125°C
f = 10Hz to 100kHz
IO= 1A
VI= 12.5V to 28V
IO=5mA to 1A
25°C
25°C
25°C
0°C to 125°C
25°C
25°C
MIN
9.6
9.5
55
TYP
10
10
7
2
71
12
4
0.018
-1.0
70
2.0
4.3
400
2.2
MAX UNIT
10.4
10.5
V
200
mV
100
dB
200
mV
100
W
mV/°C
µV
V
8 mA
1.0
mA
0.5
mA
A
*Pulse testing tehniques are used to maintain the junction temperature as close to the ambient temperature as possible.
Thermal effects must be taken into account.
** The specification applies only for DC power dissipation permitted by absolute maximum ratings
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