BA6386K Просмотр технического описания (PDF) - ROHM Semiconductor

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BA6386K

Preservo amplifier for CD players

ROHM Semiconductor 

Optical disc ICs

(2) FE amplifier and focus search

BA6386K

The voltage for focus search is obtained by the charging

and discharging of the capacitor attached to pin 8. The

charging current is I/10 and the discharging current is I.

The FEO output amplitude (VSERCH) at this time is deter-

mined by the formula given below.

VSERCH = ±I 15kΩ 2 (VB reference)

Moreover, from Fig. 3, I can be approximated by the for-

mula given below.

I = VCC*1.4

1

65k)R11 3

Set R11 so that I becomes 2µA or greater. Apply biasing

to the focus error signal from pin 29. If no adjustment oc-

curs, pin 29 = VB.

The timing charts when the focus loop turns ON or OFF

are given on the next page.

520

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