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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 R
N
, C
N
like in the figure 7. Note
the R
N
resistor is in the place of the INT jumper near C4. R
N
, C
N
, should be selected w ith 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
Fi gure 9. PC B Layout : Top side
Figu re 10 . Int ernal ground plane
Figure 11. Power & signal pl ane
