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L7805AB データシート(PDF) 36 Page - STMicroelectronics

部品番号 L7805AB
部品情報  Positive voltage regulators
PDF  56 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7805AB データシート(HTML) 36 Page - STMicroelectronics

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Application information
L78xx, L78xxC, L78xxAB, L78xxAC
36/56
Doc ID 2143 Rev 22
Note:
Application with high capacitance loads and an output voltage greater than 6 volts need an
external diode (see Figure 23 on page 34) 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 28.
Protection against input short-circuit with high capacitance loads



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