5
CIRCUIT OPERATIONAL DESCRIPTION
) Motor Drive IC: AT5668S
The AT5668S 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.
Motor Drive IC (AT5668S) Block Diagram
˔˶̇̈˴̇̂̅ʳ
˗̅˼̉˸̅ʻˉ̋ʼ
ˠ˨˧˘
˔˶̇̈˴̇̂̅ʳ
˗̅˼̉˸̅ʻˉ̋ʼ
˦̃˼́˷˿˸ʳ
˗̅˼̉˸̅ʻˇ˫ʼ
˦˿˸˷ʳ
˗̅˼̉˸̅ʻˇ˫ʼ
˧˻˸̅̀˴˿ʳ
˦˻̈̇ʳ˷̂̊́
ʾ
ˀ
ʾ
ˀ
˄˃˞
˅ˈ˞
˚ˡ˗
˩˶˶˅
˅ˋ
˅ˊ
˅ˉ
˅ˈ
˅ˇ
˅ˆ
˅˅
˅˄
˅˃
˄ˌ
˄ˋ
˄ˊ
˄ˉ
˄ˈ
ˋ
ˌ
˄˃
˄˄
˄˅
˄ˆ
˄ˇ
˄
˅
ˆ
ˇ
ˈ
ˉ
ˊ
ˣ˚ˡ˗
˅ˈ˞
˄˃˞
˩˶˶˄
ˣ˚ˡ˗
˩˶˶˅
˩˶˶˅
˩˶˶˄
ˣ̅˸ˀ˗˥˩
˧˥˔ˬ
˗˥˜˩˘˥
˩˖˧˟
˙˪˗
˥˘˩
˖
ˡ
˖
ˡ
˖
ˡ
ˡ˖
ˡ˖
ˡ˖
˩ˢ˧˥ˀ
˩ˢ˧˥ʾ
˩ˢ˦˟ʾ
˩ˢ˦˟ˀ
˩ˢ˙˖ˀ
˩ˢ˙˖ʾ
˩ˢ˟˗ˀ
˩ˢ˟˗ʾ
˩ˢ˧˞ˀ
˩ˢ˧˞ʾ
ˀ
ʾ
ˀ
ʾ
˩˜ˡ˦˟ʾ
˩˜ˡ˙˖
˅
˖
˖
˩
˗
ˡ
˚
˗
˟
ˡ
˜
˩
˞
˧
ˡ
˜
˩
˦
˔
˜
˕
˘
˧
˨
ˠ
˩˖˖˄
˄˃˞
˅ˈ˞
˄ˈ˞
˄˃˞
CIRCUIT OPERATIONAL DESCRIPTION
Sm(DAEWOO_DG-K511S)060115.indd 5
2006-1-16 15:30:49
Summary of Contents for DG-K511S
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Page 36: ...PCB CIRCUIT BOARD 35 5 YUV OUTPUT BOARD Sm DAEWOO_DG K511S 060115 indd 35 2006 1 16 15 31 42 ...