M62475FP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M62475FP

AUTOMATIC ADJUSTMENT CD PREAMPLIFIER SERVO CONTROLLER

MITSUBISHI ELECTRIC  

MITSUBISHI SOUND PROCESSOR ICs

M62475FP

AUTOMATIC ADJUSTMENT CD PREAMPLIFIER SERVO CONTROLLER

FUNCTION DESCRIPTION

Setting Built-in Constant Current Source Current Value

The current value of Tracking Servo (TS) and Sledge Servo (SS)

constant current can be set with resistance value Rx connected

between pin 28 and Vcc.

If the absolute values for TS and SS constant source current

values are assumed to be I (JF, JR) and I (SF, SR), respectively, they

are set as follows.

I (JF. JR) = 1

8

•

VCC-V

Rx

28

I (SF, SR) = 1

4

•

VCC-V

Rx

28

Where, V 28 is the voltage of pin 28 . If the voltage of pin 21 (GND)

is assumed to be V 21 , V 28 can be found by the following formula.

V 28 = V 21 + VBE (VBE = 0.7V standard)

EQUIVALENT CIRCUIT

B

M62475FP

35

ZERO CROSS

A

FOCUS SEARCH

CIRCUIT

SEARCH

VOLTAGE

DETECTION

31

30

CONSTANT CURRENT SOURCE BLOCK DIAGRAM

VCC

RX

28

29 14

CURRENT

REFERENCE

M62475FP

17

VBE

IJF

IJR

ISF

ISR

FZC OPERATION TIMING CHART

FOCUS SEARCH

OPERATION FOCUS SERVO ON

VA

A Vref

VB

VFSR+

B Vref

VFSR-

tup

tdown

tFSR

t

t

Vc

FSR Detector

When the focus search is performed, the focus search direction is

automatically switched.

The focus search always starts from the + side. The polarity ( +

/ - direction) internal logic signal of the focus search voltage is

used for control and switching.

FZC detection is effective only in a direction.

Setting FSR time tFSR (CFSR setting)

tFSR= CFSR

IFSR

CFSR:CFSR pin 35 external capacitor

IFSR:Focus search current

At time of rising:110µA

At time of falling:60µA

FSR Vth± Voltage setting

Vth+:Vref+0.7V

Vth-:Vref-0.7V

MITSUBISHI

ELECTRIC

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