AS1341 datasheet(10/18 Pages) AMSCO

tên linh kiện	AS1341

Giải thích chi tiết về linh kiện	650mA, Ul t ra low Ripple Step Down DC/DC Conver ter

PDF	18 Pages

Scroll/Zoom	100%

nhà sản xuất	AMSCO [ams AG]

Trang chủ	http://www.ams.com

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10 / 18 page

www.ams.com/DC-DC_Step-Up/AS1341

Revision 1.09

10 - 18

AS1341

Datasheet - A p p l i c a t i o n I n f o r m a t i o n

9 Application Information

9.1 Adjusting Output Voltage

The AS1341 feedback input features dual-mode operation. Connect FB to GND for the 5.0V preset output voltage (see Figure 21 on page 8).

Adjust the output voltage by connecting a voltage-divider from the output to GND (see Figure 22).

Figure 22. Adjustable Output Voltage Circuit

Select a value for R2 between 10k and 1M

Ω.

Calculate R1 as:

(EQ 2)

Where:

VFB = 1.25V.

VOUT may range from 1.25V to VIN.

9.2 Negative Output Voltage

VIN may range from 4.5V to (20V-VOUT). Therefore the maximum negative output voltage is -15V.

Figure 23. Adjustable Negative Output Voltage Circuit

VIN

4.5V to 20V

SHDNN

OUT

CIN

1.25V to VIN

GND

ILIMIT

COUT

Indicates High-Power Trace

AS1341

POK

RPULL

OUT

-------------

–









⋅

VIN

4.5V to (20V-VOUT)

SHDNN

OUT

CIN

VOUT = -1.25V to -15V

GND

ILIMIT

Indicates High-Power Trace

AS1341

POK

COUT

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