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L78 データシート(PDF) 34 Page - STMicroelectronics

部品番号 L78
部品情報  Positive voltage regulator ICs
PDF  58 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L78 データシート(HTML) 34 Page - STMicroelectronics

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Application information
Positive voltage regulator ICs
34/58
DocID2143 Rev 32
Note:
Application with high capacitance loads and an output voltage greater than 6 volts need an
external diode (see Figure 22 on page 31) to protect the device against input short circuit. In
this case the input voltage falls rapidly while the output voltage decrease slowly. The
capacitance discharges by means of the base-emitter junction of the series pass transistor
in the regulator. If the energy is sufficiently high, the transistor may be destroyed. The
external diode by-passes the current from the IC to ground.
Figure 27. Protection against input short-circuit with high capacitance loads



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