L7820CD2T-TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L7820CD2T-TR

Positive voltage regulators

STMicroelectronics 

L78xx - L78xxC

Typical performance

Figure 35. Adjustable output voltage with temperature compensation

VO = VXX (1+R2/R1) + VBE

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 36. Light controllers (VOmin = VXX + VBE)

VO falls when the light goes up

VO rises when the light goes up

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