LM7915CT National Semiconductor, LM7915CT Datasheet

IC NEGATIVE VOLT REGULATOR -15V TO-220-3

LM7915CT

Manufacturer Part Number
LM7915CT
Description
IC NEGATIVE VOLT REGULATOR -15V TO-220-3
Manufacturer
National Semiconductor
Datasheet

Specifications of LM7915CT

Primary Input Voltage
-30V
Output Voltage Fixed
-15V
Dropout Voltage Vdo
1.1V
No. Of Outputs
1
No. Of Pins
3
Output Current
1.5A
Operating Temperature Range
0°C To +150°C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 2001 National Semiconductor Corporation
LM79XX Series
3-Terminal Negative Regulators
General Description
The LM79XX series of 3-terminal regulators is available with
fixed output voltages of −5V, −12V, and −15V. These devices
need only one external component — a compensation ca-
pacitor at the output. The LM79XX series is packaged in the
TO-220 power package and is capable of supplying 1.5A of
output current.
These regulators employ internal current limiting safe area
protection and thermal shutdown for protection against vir-
tually all overload conditions.
Low ground pin current of the LM79XX series allows output
voltage to be easily boosted above the preset value with a
Connection Diagrams
Order Number LM7905CT, LM7912CT or LM7915CT
See NS Package Number TO3B
TO-220 Package
Front View
DS007340
DS007340-14
resistor divider. The low quiescent current drain of these
devices with a specified maximum change with line and load
ensures good regulation in the voltage boosted mode.
For applications requiring other voltages, see LM137
datasheet.
Features
n Thermal, short circuit and safe area protection
n High ripple rejection
n 1.5A output current
n 4% tolerance on preset output voltage
Typical Applications
*
more than 3". For value given, capacitor must be solid
tantalum. 25µF aluminum electrolytic may be substituted.
solid tantalum. 25µF aluminum electrolytic may be substi-
tuted. Values given may be increased without limit.
For output capacitance in excess of 100µF, a high current
diode from input to output (1N4001, etc.) will protect the
regulator from momentary input shorts.
Required if regulator is separated from filter capacitor by
Required for stability. For value given, capacitor must be
Fixed Regulator
DS007340-3
September 2001
www.national.com

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LM7915CT Summary of contents

Page 1

... Connection Diagrams TO-220 Package Front View Order Number LM7905CT, LM7912CT or LM7915CT See NS Package Number TO3B © 2001 National Semiconductor Corporation resistor divider. The low quiescent current drain of these devices with a specified maximum change with line and load ensures good regulation in the voltage boosted mode ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage (V = −5V −12V and −15V) o Electrical Characteristics Conditions unless otherwise noted: I Part Number Output Voltage Input Voltage (unless otherwise specified) ...

Page 3

Electrical Characteristics Conditions unless otherwise noted: I OUT Part Number Output Voltage Input Voltage (unless otherwise specified) Symbol Parameter I Quiescent Current Q I Quiescent Current Q Change V Output Noise Voltage n Ripple Rejection Dropout Voltage I Peak Output ...

Page 4

Typical Applications Bypass capacitors are necessary for stable operation of the LM79XX series of regulators over the input voltage and output current ranges. Output bypass capacitors will improve the transient response by the regulator. The bypass capacitors, (2.2µF on the ...

Page 5

... Necessary only if raw supply filter capacitor is more that 2" from LM7905 *Improves transient response and ripple rejection. Do not increase beyond 50 µF. Select R2 as follows: LM7905CT 300 LM7912CT 750 LM7915CT 1k Light Controller Using Silicon Photo Cell High-Sensitivity Light Controller Variable Output 5 DS007340-8 ...

Page 6

Typical Applications (Continued) Load Regulation Output Ripple 3000µ Temperature Stability Output Noise 10Hz f 10kHz *Resistor tolerance of R4 and R5 determine matching of (+) and (−) outputs. ...

Page 7

Schematic Diagrams 7 www.national.com ...

Page 8

Schematic Diagrams www.national.com (Continued) 8 ...

Page 9

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted TO-220 Outline Package (T) Order Number LM7905CT, LM7912CT or LM7915CT NS Package Number T03B 2. A critical component is any component of a life ...

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