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AN2259 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN2259
Description  High intensity LED driver using
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2259 Datasheet(HTML) 10 Page - STMicroelectronics

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3 CURRENT FEEDBACK LOOP
AN2259
10/38
For an output current of 700mA the value of Rs would be 0.34
Ω. If R1 and R2 are small
enough, the effect of the bias current can be ignored.
On the evaluation board, the value of Rs is selected by jumpers J2 and J4. When both J2 and
J4 are open, the output current is set to 350mA. Inserting each jumper connects a 0.68
Ω
resistor in parallel with the 0.68
Ω Rs. With J2 shorted, the output current will be set to 700mA
and the output current becomes 1A with both J2 and J4 shorted.



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