CXA2534Q 데이터 시트보기 (PDF) - Sony Semiconductor

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CXA2534Q

4-Channel CD Motor Driver

Sony Semiconductor 

CXA2534Q

Description of Operation

1. H-Bridge Driver

a) Gain Setting

The input resistances of the Sled, Focus and Track channels are 11 kΩ (typical); the input resistance of

the Spindle channel is 7.5 kΩ (typical). The gain can be adjusted by connecting a external resistor, R at

the input pin of the channel.

Channel

Sled channel

Focus channel

Track channel

Spindle channel

55 kΩ

GV = 20 log

11 kΩ + R

110 kΩ

GV = 20 log

7.5 kΩ + R

Unit

dB

R - External Resistor

dB

b) Mute

The Spindle channel operates normally when the SP MUTE (pin 13) is open or at LOW (below 0.8 V).

The output will be muted when the SP MUTE pin is at HIGH (above 2 V). This is a high impedance

mute as the spindle output voltage will be not pulled to LOW.

The Focus and Track channels share the same mute pin (pin 8). The channels are muted when the FT

MUTE pin (pin 8) is open or at LOW level (below 0.8 V). When the Focus and Track channels are

muted, the quiescent current at the VCC2 pin is also reduced by almost half. This is because the bias

are removed when the mute is on.

c) Thermal Shutdown

The H-bridge Driver has an internal thermal shutdown circuit. All the channels outputs will be muted

when the chip temperature exceeds 170 °C (typical) and restored when the chip temperature falls to 140

°C (typical).

d) VREF pin

When the VREF pin (pin 4) is below 1 V (typical), the H-bridge driver will be at standby mode and the

quiescent current is zero (typical).

e) Dead Band

Dead band = 2 × input Resistance (attached external resistor + internal resistor) × 0.5 µA

The dead band is depended on input resistance. Thus, the dead band varies with the gain settings.

The dead band is 7.5 mV for Spindle channel and 11 mV for Sled, Focus and Track channels.

—18—

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