AN2937 datasheet(16/41 Pages) STMICROELECTRONICS

Part #	AN2937

Description	Power system demonstration kit based on the PM6686 dual

PDF	41 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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16 / 41 page

Jumper settings

AN2937

16/41

Doc ID 15418 Rev 1

Jumper settings

It is possible to select different operating conditions by using the jumpers.

Note:

Please notice that jumpers S6, S7, S8, S9, S10, S11, S12 and S13 are already soldered on

the demonstration board and do not need to be changed. Refer to the schematic in Figure 2

to check each connection.

9.1

Switching sections - operating modes

Table 3.

Jumper S1 SKIP (connect SKIP pin to S1)

Position

Operating mode of switching sections

GND

If the SKIP pin is tied to ground, a pulse-skip mode takes place at light loads. A zero-

crossing comparator prevents the inductor current from going negative.

VREF2

If the SKIP pin is tied to the VREF pin, a pulse-skip mode is enabled with a minimum

switching frequency about 25 kHz (ultrasonic mode).

VCC

If the SKIP pin is tied to 5 V, fixed PWM mode occurs. The switching output is in a

position to sink and source current from the load.

AN2937 Datasheet(PDF) 16 Page - STMicroelectronics