SA5664 Datasheet, PDF (5/12 Pages) Silan Microelectronics Joint-stock – 3-PHASE SPINDLE MOTOR DRIVER FOR CD-ROM

SA5664
FUNCTION DESCRIPTIONS
(1) Input-output table
Input condition
Pin no.
9 10 11 12 13 14
H1+ H1- H2+ H2- H3+ H3-
Condition1 L M H M M M
Condition2 H M L M M M
Condition3 M M L M H M
Condition4 M M H M L M
Condition5 H M M M L M
Condition6 L M M M H M
Caution1: regular EC<ECR, reverse EC>ECR
Input voltage: H=2.6 V, M=2.5 V , L=2.4 V
Output
Regular
Reverse
7
4
2
74
2
A1 A2 A3 A1 A2 A3
HL
L
LH
H
LH
H
HL
L
L
H
L
HL
H
H
L
H
LH
L
L
L
H
HH
L
LHH LL H
Test
point
7 pin HI
7pin low
4 pin HI
4pin low
2pin HI
2pin low
(2) Torque voltage range, gain switch
Fig.1
l By amplifying the voltage difference between Ec and ECR from servo IC, the torque sense amp produces
the input (VAMP) for the current sense amp.
l The output current (Io) is converted into the voltage (VNF) through the sense resistor (RNF) and compared
with the VAMP. By the negative feedback loopˈthe sensed output voltage, VNF is equal to the input VAMP.
Therefore, the output current (Io) is linearly controlled by the input VAMP.
l As a result, the signals Ec and ECR can control the velocity of Motor by controlling the output current (Io) of
the driver.
l The range of the torque voltage is shown Fig.2
Fig.2
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2005.08.09
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