MC79xxCT Series
Vishay
New Product
formerly General Semiconductor
3-Terminal Fixed Negative Voltage Regulators
Pin Arrangement
Description
These voltage regulators are intended as complements
to the popular MC78xx Series devices. These negative regulators are available in the same seven-voltage options as
the MC78xx devices. In addition, one extra voltage
option commonly employed in MECL systems is also
available in the negative MC79xx Series.
TO-220
1. Ground
3
2. Input
2
1
3. Output
(heatsink connected to pin 2)
Available in fixed output voltage options from –5.0 to –24
volts, these regulators employ current limiting, thermal shutdown, and safe-area compensation – making them remarkably rugged under most operating conditions. With adequate
heatsinking they can deliver output currents in excess of
1.5 ampere.
Standard Application
Features
Input
Output
MC79xx
• Output current in excess of 1.5 Ampere
• No external components required
Co
0.1µF
Cin
0.33µF
• Internal thermal overload protection
• Internal short-circuit current limiting
• Output transistor safe-area compensation
• Output voltage offered in 2% tolerance
Notes:
A common ground is required between the input and the output voltages.
The input voltage must remain typically 2.0V more negative even during
the high point on the input ripple voltage.
Mechanical Data
Case: TO-220 Package
Weight: approx. 2.24g
xx = these two digits of the part number indicate output voltage.
Cin is required if regulator is located an appreciable distance from power
supply filter.
Case outline is on the back page
Co improves stability and transient response.
Internal Block Diagram
GND
R1
R2
Reference
Voltage
Output
+
Q1
-I1
I2
Q2
Short Circuit
Protection
RSC
Input
Document Number 74814
11-Jun-02
www.vishay.com
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