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AN2870 Datasheet(PDF) 35 Page - STMicroelectronics

Part # AN2870
Description  L6585DE combo IC
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2870 Datasheet(HTML) 35 Page - STMicroelectronics

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AN2870
Designing with L6585DE
35/41
Figure 18.
EOL - Cblock to ground
Lamp to GND configuration:
In case of lamp to ground configuration the fix reference mode is suggested.
In order to set this mode a resistor placed between EOLP and GND is needed: its value has
to be chosen as follows:
●
75 k
Ω < R
eolp < 91kΩ → window amplitude = 240 mV
●
620 k
Ω < R
eolp → window amplitude = 720 mV
The EOL pin biasing proceeds as follows:
A voltage shift is needed in order to detect a null value with a positive referenced
comparator: two Zener diodes are requested.
The current capability of EOL pin is equal to 5.5 µA, therefore the minimum Zener voltage
that guarantees accuracy of the measurement is 8 V.



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