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L7905C Scheda tecnica(PDF) 8 Page - STMicroelectronics

Il numero della parte L7905C
Spiegazioni elettronici  NEGATIVE VOLTAGE REGULATORS
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7905C Scheda tecnica(HTML) 8 Page - STMicroelectronics

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Figure 1 : Fixed Output Regulator.
Figure 2 : Split Power Supply (
± 15V/1A).
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. C1 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 (1N4001 or similar) should
be introduced to protect the device from momentary input short
circuit.
Against potential latch-up problems.
APPLICATION INFORMATION
Figure 3 : Circuit for Increasing Output Voltage.
Figure 4 : High Current Negative Regulator
(– 5V/4A with 5A current limiting).
C3 Optional for improved transient response and ripple rejection.
Figure 5 : Typical ECL System Power Supply
(– 5.2V/4A).
Optional dropping resistor to reduce the power dissipated in the
boost transistor.
VO = V XX
R 1
+ R 2
R 2
V XX
R 2
> 3I d
L7900
8/13


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