L6995STR datasheet(13/26 Pages) STMICROELECTRONICS

13 / 26 page

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13/26

L6995S

5.3 NOTE

There is a linear regulator on board, it allows to use one generator (only for the power section, in fact the IC

section is powered by the linear regulator); if the regulator is used close the J1, other wise it has to keep open.

Be careful measuring the efficiency with the linear regulator asserted.

At high current in the integrator configuration (around 20A), it can be seen an oscillation in the switching fre-

quency due to the noise interaction, to reduce this oscillation put a noise filter RN, CN like in the figure 9. Note

the RN resistor is in the place of the INT jumper near C4. RN, CN, should be selected with a pole frequency

around 1Mhz, but anyway higher than switching frequency (five times).

5.4 DEMOBOARD LAYOUT

Real dimensions: 5,7 cm X 7,7 cm (2,28inch X 3, 08inch)

Figure 11. PCB layout: bottom side

Figure 12. PCB Layout: Top side

Figure 13. Internal ground plane

Figure 14. Power & signal plane

L6995STR 数据表(PDF) 13 Page - STMicroelectronics