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L7809AB Datasheet(PDF) 35 Page - STMicroelectronics

Part # L7809AB
Description  Positive voltage regulator ICs
PDF  57 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7809AB Datasheet(HTML) 35 Page - STMicroelectronics

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DocID2143 Rev 31
35/57
L78xx, L78xxC, L78xxAB, L78xxAC
Application information
Note:
Q2 is connected as a diode in order to compensate the variation of the Q1 VBE with the
temperature. C allows a slow rise time of the VO.
Figure 26. Adjustable output voltage with temperature compensation
VO = VXX (1+R2/R1) + VBE
Figure 27. Light controllers (VO(min) = VXX + VBE)
VO rises when the light goes up
VO falls when the light goes up



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