AS3675 datasheet(14/81 Pages) AMSCO

номер детали	AS3675

подробное описание детали	Flexible Lighting Management Unit

PDF	81 Pages

Scroll/Zoom	100%

производитель	AMSCO [ams AG]

домашняя страница	http://www.ams.com

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

Figure 13. Step Up DC/DC Converter Detail Diagram; Option: Regulated Output Current, Feedback is

automatically selected between CURR1, CURR2, CURR6 (step_up_fb_auto=1); over voltage protection

is enabled (step_up_prot=1); 1MHz clock frequency (step_up_frequ=0)

8.2.3

Voltage Feedback

Setting bit step_up_fb (see page 15) = 00 enables voltage feedback at pin DCDC_FB.

The output voltage is regulated to a constant value, given by (Bit step_up_res should be set to 1 in this configuration)

UStep up_out = (R2+R3)/R3 *1.25 + IDCDC_FB * R2

(EQ 2)

If R4 is not used, the output voltage is by (Bit step_up_res should be set to 0 in this configuration)

UStep up_out = 1.25 + IDCDC_FB * R2

(EQ 3)

Where:

UStep up_out = Step Up DC/DC Converter output voltage

R2 = Feedback resistor R2

R3 = Feedback resistor R3

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AS3675

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