T
treez
Guest
Hello,
The circuit involving the PNP, Q2, on page 24 (last page) of the following datasheet (LT3756 buck led driver) shows Q2 being used to signal when the LED load goes open (ie when the output goes overvoltage). Why does it use three 200K resistors in its circuit.? Surely only two 200K resistors are needed , ie the one in its emitter connection, and the one drawn horizontally into its base? The one running into the base from the supply rail can surely be omitted?
So why three 200K resistors?
http://cds.linear.com/docs/en/datasheet/375612fb.pdf
The circuit involving the PNP, Q2, on page 24 (last page) of the following datasheet (LT3756 buck led driver) shows Q2 being used to signal when the LED load goes open (ie when the output goes overvoltage). Why does it use three 200K resistors in its circuit.? Surely only two 200K resistors are needed , ie the one in its emitter connection, and the one drawn horizontally into its base? The one running into the base from the supply rail can surely be omitted?
So why three 200K resistors?
http://cds.linear.com/docs/en/datasheet/375612fb.pdf
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