Sanyo DVD-DX500 Service Manual page 6

) Motor Drive IC: AT5888S
The AT5868S is a 5-channel BTL driver IC for driving the motors and actuators in products
such as CD-ROM/DVD-ROM/DVD-Player drives. Two of the channels use current feedback to
minimize the current phase shift caused by the influence of load inductance. Driver IC gener-
ates the focus signal and the tracking signal for pick-up actuator, the sled signal for feed,
spindle signal and the load signal for opening and closing of the tray. The focus signal, the
tracking signal, the sled signal and the spindle signal are input into each relaxant port of
the drive IC(in the order of No. 26 pin, 23, 4, and ) and set the gain amplification and the
center voltage through the internal OP-AMP and drive on both sides and then the focus sig-
nal and the tracking signal will be output as VOFC+, VOFC- and VOTK+, VOTK- on actuator,
the sled signal and the spindle signal will be output as VOSL+, VOSL- and VOLD+, VOLD- on
each motor. For the load signal the input opening/closing signal is output as VOTR+, VOTR-
through the loading PRE FWD REV circuit.
MUTE
Thermal
Shut down
Sm(SANYO_DVD-DX500)051220.indd 5
MUTE BIAS VINTK TRB_2 NC
28 27 26 25 24
10K
+
25K
25K
10K
+
+
10K
1 2 3 4 5
VINFC TRB_1 REGO2 VINSL+
REGO1
Motor Drive IC (AT5888S) Block Diagram
CIRCUIT OPERATIONAL DESCRIPTION CIRCUIT OPERATIONAL DESCRIPTION
VINLD GND VCTL NC
23 22 21 20
GND PGND
10K
-
25K
Pre-DRV
Vcc1
PGND
6 7 8 9
FWD REV VCC1 VOTR-
5
VCC2
VOLD- VOLD+ VOTK- VOTK+
19 18 17 16 15
Vcc2
15K
Actuator
Spindle
-
Driver(6x)
Driver(4X)
Sled Actuator
Driver(4X) Driver(6x)
TRAY
DRIVER
10 11 12 13 14
VOTR+ VOSL+ VOSL- VOFC- VOFC+
Vcc2
Vcc2
Vcc1
2005-12-29 8:58:39