79xx
PLASTIC-ENCAPSULATE VOLTAGE REGULATORS
FEATURES
Maximum Output Current IO: 1.5A
Output Voltage VO: -5,-6,-8,-9,-10,-12,-15,-18,-20,-24 V
Continuous Total Dissipation
PD: 1.25 W (Ta= 25 ℃ )
Surface Mount device
SCHEMATIC DIAGRAM
Gnd
TO-252
2.0 k
8.0 k
1.0 k
3.6 k
1.2 k
4.0 k
R
1
1.6 k
R
2
V
O
10 k
20 pF
10 pF 10 k
240
20 k 20 k
2.0 k
0.3
1.1 k
750
V
I
This device contains 26 active transistors.
MECHANICAL DATA
Case: TO-252
Case Material: Molded Plastic. UL flammability
Classification Rating: 94V-0
Weight: 0.055 grams (approximate)
MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified)
Parameter
Symbol
Value
Unit
V
-35
=-5~-18V
VO
=-20~-24V
VO
Input Voltage
Vi
-40
Internally Limited
65
V
Total Dissipation
PD
W
Thermal Resistance from Junction to Ambient
Thermal Resistance from Junction to Case
RθJA
RθJc
°C/W
°C/W
°C
5.0
T
opr
0~+125
Operating Temperature
TSTG
-65 ~+125
°C
Storage Temperature Range
TEST CIRCUIT(Typical Applications)
78 series
GND
IN
OUT
+Vo
+Vin
COM
-Vin
2.2µF
1µF
+
0.33uF
0.33uF
D1
D2
0.1uF
+
1
CO
CI
Note : In the above positive and negative
power supply application, D1 and D2
should be connected. If D1 and D2
are not connected, either of positive
or negative power supply circuit may
not turns on.
2
3
- VI
Input
- VO
Output
79XX
0.1uF
COM
Figure 1.Negative Fixed output regulator
IN
OUT
-Vo
79 series
Figure 2.Positive/Negative Voltage Supply
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 value
shown should be selected. CI is required if regulator is located an appreciable distance from power supply filter.
(3) To improve transient response. If large capacitors are used, a high current diode from input to output (1N400l or similar)
should be introduced to protect the device from momentary input short circuit.
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