LM7909 Fairchild Semiconductor, LM7909 Datasheet - Page 12

• Manufacturer Part Number: LM7909
• Description: The LM79XX series of three terminal negative regulators are available in TO-220 package and with several fixed output voltages, making them useful in a wide range of applications
• Manufacturer: Fairchild Semiconductor

LM79XX
Typical Applications
Notes:
(1) To specify an output voltage, substitute voltage value for "XX "
(2) Required for stability. For value given, capacitor must be solid tantalum. If aluminium electronics are used, at least ten times
(3) To improve transient response. If large capacitors are used, a high current diode from input to output (1N400l or similar)
12
value shown should be selected. C
should be introduced to protect the device from momentary input short circuit.
I
is required if regulator is located an appreciable distance from power supply filter.
+ 15V
- 15V
Figure 6. Negative Fixed output regulator
Figure 7. Split power supply ( ± 12V/1A)
- V
C1
Input
C1
I
+
+
C
2.2 μ F
I
0.33 μ F
+
2
1
2.2 μ F
2
MC7812
LM7912
KA7812
KA7912
LM79XX
KA79XX
1
2
1
Co
Co
3
1 μ F
1 μ F
3
+
3
+
+ 1 μ F
C
Output
*
*
1N4001
1N4001
O
- V
+12V
GND
-12V
O