L6995D datasheet(13/25 Pages) STMICROELECTRONICS

Teilenummer	L6995D

Bauteilbeschribung	STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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L6995

2.3 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 7. 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).

2.4 DEMOBOARD LAYOUT

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

Figure 8. PCB layout: bottom side

Figure 9. PCB Layout: Top side

Figure 10. Internal ground plane

Figure 11. Power & signal plane

L6995D Datenblatt(PDF) 13 Page - STMicroelectronics