AN2259 datasheet(10/38 Pages) STMICROELECTRONICS

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AN2259 Datasheet(PDF) 10 Page - STMicroelectronics

Part #	AN2259

Description	High intensity LED driver using

Download	38 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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10 / 38 page

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.

Manufacturer	Part #	Datasheet	Description
Freescale Semiconductor...	AN2250	91Kb / 2P	16-bit Microcontrollers MC9S12A128
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