MC79XXCT Vishay, MC79XXCT Datasheet

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MC79XXCT

Manufacturer Part Number
MC79XXCT
Description
3-terminal Fixed Negative Voltage Regulators
Manufacturer
Vishay
Datasheet
Document Number 74814
11-Jun-02
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.
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.
Co improves stability and transient response.
GND
0.33 F
I1
Input
Cin
Reference
Voltage
TO-220
1. Ground
2. Input
3. Output
(heatsink connected to pin 2)
Internal Block Diagram
Standard Application
I2
3-Terminal Fixed Negative Voltage Regulators
+
--
MC79xx
Short Circuit
Protection
Pin Arrangement
1
2
3
Q1
Q2
0.1 F
Output
R1
R2
R
Output
Co
Input
New Product
SC
Description
These voltage regulators are intended as complements
to the popular MC78xx Series devices. These negative reg-
ulators 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.
Available in fixed output voltage options from –5.0 to –24
volts, these regulators employ current limiting, thermal shut-
down, and safe-area compensation – making them remark-
ably rugged under most operating conditions. With adequate
heatsinking they can deliver output currents in excess of
1.5 ampere.
Features
• Output current in excess of 1.5 Ampere
• No external components required
• Internal thermal overload protection
• Internal short-circuit current limiting
• Output transistor safe-area compensation
• Output voltage offered in 2% tolerance
Mechanical Data
Case: TO-220 Package
Weight: approx. 2.24g
Case outline is on the back page
formerly General Semiconductor
MC79xxCT Series
www.vishay.com
Vishay
1

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MC79XXCT Summary of contents

Page 1

... Internal short-circuit current limiting • Output transistor safe-area compensation • Output voltage offered in 2% tolerance Mechanical Data Case: TO-220 Package Weight: approx. 2.24g Case outline is on the back page R1 R2 Output Input MC79xxCT Series Vishay formerly General Semiconductor www.vishay.com 1 ...

Page 2

... MC79xxCT Series Vishay formerly General Semiconductor Maximum Ratings Ratings at 25°C ambient temperature unless otherwise specified. Parameter (1) Input Voltage (2) Input Voltage (3) Power Dissipation Operating Junction Temperature Range Storage Junction Temperature Range Notes: (1) MC7905 to MC7918 (2) MC7924 (3) Follow the derating curve. When T exceeds 150°C, the internal circuit cuts off the output J Electrical Characteristics – ...

Page 3

... V = –11 to –21V 100mA 120Hz 1.0A, T drop Io 25°C peak J ∆V o /∆ 5mA MC79xxCT Series formerly General Semiconductor Min. Typ. Max. –5.88 –6.0 –6.12 –5.82 — –6.18 — 4 120 — 1.5 60 — 10 120 — — ...

Page 4

... MC79xxCT Series Vishay formerly General Semiconductor Electrical Characteristics – MC7909 Vin = –15V 500mA, Cin = out Parameter Output Voltage Line Regulation (T = 25°C) J Load Regulation (T = 25°C) J Quiescent Current Quiescent Current Change (T = 25°C) J Output Noise Voltage (T = 25°C) J Ripple Rejection Ratio ...

Page 5

... V = –21 to –31V 100mA 120Hz 1.0A, T drop Io 25°C peak J ∆V o /∆ 5mA MC79xxCT Series formerly General Semiconductor Min. Typ. Max. –14.7 –15 –15.3 –14.55 — –15.45 — 11 300 — 3 150 — 12 300 — 4 150 — ...

Page 6

... MC79xxCT Series Vishay formerly General Semiconductor Electrical Characteristics – MC7924 V = –33V 500mA out in Parameter Output Voltage Line Regulation (T = 25°C) J Load Regulation (T = 25°C) J Quiescent Current Quiescent Current Change (T = 25°C) J Output Noise Voltage (T = 25°C) J Ripple Rejection Ratio ...

Page 7

... I = 20mA 1.0V(RMS) in 6.22 6.18 6.14 6.10 6. --25 MC79xxCT Series formerly General Semiconductor Fig. 2 – Quiescent Current -11V V = -6. 20mA 100 T -- Junction Temperature (°C) J Fig. 4 –Ripple Rejection Ratio vs. Frequency Vin = --11V V = --6. 20mA o 100 1 ...

Page 8

... MC79xxCT Series Vishay formerly General Semiconductor 10.25 ± 0.25 13.9 ± 0.41 2.53 ± 0.185 www.vishay.com 8 TO-220 Case Outline 3.84 ± 0.6 Dia. 2.69 ± 0.25 6.26 ± 0.25 14.8 ± 0.51 8.54 ± 0.26 3.94 ± 0.375 Dimensions in millimeters 1.3 ± 0.185 0.387 ± 0.09 0.8 ± 0.12 4.85 ± 0.375 1.27 ± 0.12 28.7 ± 0.92 2.55 ± 0.375 Document Number 74814 11-Jun-02 ...

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