AN2808 datasheet(13/40 Pages) STMICROELECTRONICS

部件名	AN2808

功能描述	The PM6670S device is a complete

PDF	40 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

13 / 40 page

AN2808

Configuration

13/40

Configuration

The PM6670S board includes four jumpers (JP1, JP2, JP3 and JP5) and two resistors,

which can be configured to select the desired mode of operation.

7.1

JP3 fixed or adjustable output voltage (mode pin)

The JP3 jumper is used to choose between a fixed output voltage (1.5 or 1.8 V) and a

user-defined output voltage in the range of 0.9 to 2.6 V. When connected in the lower

position, the fixed output voltage is selected and the voltage depends on the setting of the

DDRSEL pin (Section 7.2).

If JP3 is in the upper position, the output voltage is given by:

Equation 1

Figure 9.

JP3 (mode) setting

Both the R8 and R9 resistors are set to 39 k

Ω (1.8 V by default) and can be changed by the

user.

VDDQ

ADJ

0.9

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

⋅

AN2808 数据表(PDF) 13 Page - STMicroelectronics