BD7905BFS

更新时间： 2024-02-19 09:46:53

品牌	Logo	应用领域
罗姆 - ROHM		驱动器 DVD
页数	文件大小	规格书
18页	202K
描述
6CH Power Driver for CD-ROM, DVD-ROM

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数据手册

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BD7905BFS 数据手册

BD7905BFS

Optical disc ICs

6. Muting functions

a) V^C-drop muting

When the voltage at V^Cterminal (pin 27) drops to a value lower than 0.7V (Typ.), the outputs of all the channels are

turned off. Set the V^Cterminal voltage to larger than 1.0V.

b) V^CC-drop muting

When the voltages at DV^CCterminal (pin 54) and VCC terminal (pin 51) drop to lower than 3.8V (Typ.), the outputs of

all the channels are turned off.

7. Thermal-shutdown

A thermal-shutdown circuit (over-temperature protection circuit) is built in to prevent the IC from thermal breakdown.

Use the IC under the thermal loss allowed to the package. In case the IC is left running over the allowable loss, the

junction temperature rises, and the thermal-shutdown circuit works at the junction temperature of 175°C (Typ.) (the

outputs of all the channels are turned off). When the junction temperature drops to 150°C (Typ.), the IC start operating

again.

!Application example

SLVM=12V

TRACKING

FOCUS

TRACKING

FOCUS

SLED SLED

IN2

−

IN1

DVCC=5V

CC=12V

=5V

47k

67k

47k

LEVEL

SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

PRE

LOGIC

PRE

LOGIC

−

117.5k

47k

−

TSD

67k

LIMIT

47k

−

OSC

Current

LIMIT

OSC

Polarity

COMP

REVERSE

DETECT

188k

−

75k

PRE LOGIC

−

47k

112.5k

STBY/

HALL

BIAS

BRAKE

CONTROL

µ-COM

SPINDLE

SPRNF

SPVM=12V

Fig.3

15/17

1...12 13 141516 17 18

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