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參數(shù)資料
| 型號： | BD7902CFS |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | 6CH Power Driver for CD-ROM, DVD-ROM |
| 中文描述： | 6路功率驅(qū)動(dòng)器為CD - ROM，DVD - ROM光碟 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 200K |
| 代理商： | BD7902CFS |
BD7902CFS
Optical disc ICs
4. Torque command (spindle: pin 24, sled motor: pin 28 and 29) / output current detection terminals (spindle: pin 20, sled
motor: pin 31 and 32)
The relation between the torque command input and the output current detection terminals input is expressed as
shown below:
15/17
VC
SPIN
SLIN1, 2
SPRNF
SLRNF
FWD rotation
Dead zone
+
Dead zone
The input-output gain (gm) and the output-limit current (ILIM) depend on the resistance of RNF (output current
detection resistor). Please refer to the following expression.
The gain to drive the spindle or the sled motor can be decreased by connecting a resistor in series to each input
terminal.
Spindle
Sled
Input-output gain gm (A/V)
Output-limit current Ilim (A)
Gain with the added resistor gm (A/V)
1.0/RNF
0.47/RNF
15k/
{
SPRNF
×
(Rin
+
15k)
}
0.5/RNF
Rin : added series resistor
0.47/RNF
0.5
×
47k/
{
SLRNF
×
(Rin
+
47k)
}
Gain expression
5. PWM oscillation frequency
The PWM oscillation for driving the spindle and sled is free running. The oscillating frequency is 100kHz (typ.).
6. Muting functions
a) VC-drop muting
When the voltage at VC terminal (pin 27) drops to a value lower than 0.7V (typ.), the outputs of all the channels are
turned off. Set the VC terminal voltage to larger than 1.0V.
b) V
CC
-drop muting
When the voltages at DV
CC
terminal (pin 54) and V
CC
terminal (pin 51) drop to lower than 3.8V (typ.), the outputs of
all the channels are turned off.
c) Over voltage protection circuit
When the voltages at V
CC
terminal (pin 51) drop to uper than 15.5V (typ.), the output of only the spindle block is
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.
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