SA5664 데이터 시트보기 (PDF) - Silan Microelectronics

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SA5664

3-PHASE SPINDLE MOTOR DRIVER FOR CD-ROM

Silan Microelectronics 

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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