l7908cp STMicroelectronics, l7908cp Datasheet - Page 8

• Manufacturer Part Number: l7908cp
• Description: Negative Voltage Regulators
• Manufacturer: STMicroelectronics

Figure 3 : Circuit for Increasing Output Voltage.
L7900
APPLICATION INFORMATION
Figure 1 : Fixed Output Regulator.
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 electrolitics are used, at least ten times
value should be selected. C
appreciable distance from power supply filter.
3. To improve transient response. If large capacitors are used, a
high current diode from input to output (1N4001 or similar) should
be introduced to protect the device from momentary input short
circuit.
C3 Optional for improved transient response and ripple rejection.
Figure 5 : Typical ECL System Power Supply
Optional dropping resistor to reduce the power dissipated in the
boost transistor.
8/13
V
O
= V
XX
R
1
R
(– 5.2V/4A).
+ R
2
2
1
is required if regulator is located an
V
R
XX
2
>
3
I
d
Figure 4 : High Current Negative Regulator
Figure 2 : Split Power Supply ( 15V/1A).
Against potential latch-up problems.
(– 5V/4A with 5A current limiting).