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参数资料
| 型号： | LB8109M |
| 元件分类： | 运动控制电子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 0.8 A, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 7/9页 |
| 文件大小： | 640K |
| 代理商： | LB8109M |
LB8109M
No. 5233-7/9
Continued from preceding page.
Pin No.
Symbol
Equivalent circuit
Function
Continued on next page.
Input pin for start-up circuit when an
external voltage input is applied. The
external voltage input is applied
through a resistor inserted in series.
The voltage is basically determined by
the Zener diode + 2VBE ; this pin has a
current draining capacity up to 20 mA.
LB8109M start-up input. (Start on a
low-level input.)
Inverting input pin for internal OP
amplifier.
Noninverting input pin for internal OP
amplifier.
Output pin for internal OP amplifier.
The output circuit type is ‘‘push-pull.’’
Pin for selecting battery charging when
external voltage input is applied. This
pin determines the drop voltage for the
external voltage input. When low, the
drop voltage set by VEXT is selected;
when high, the drop voltage set by
VEXT-CHG is selected.
Input pin for simultaneously muting the
drivers for the four channels. (High:
mute)
Pin for switching the spindle driver
transfer gain between 8.3 dB and
14.8 dB (typ. value each). (Low: high
gain)
Pin for switching the sled driver
between V-type control and step
control. (High: V-type control; low: step
control)
Power supply voltage pin.
Threshold input pin for driving the sled
motor stepwise. Both the positive and
negative step levels (with positive
negative symmetry) are determined by
the voltage differential between the pin
voltage and the ASPREF pin voltage.
Output Tr. GND for the four-channel H
bridge drivers. This pin is not internally
connected to the small-signal system
GND.
20
24
21
22
23
14
25
26
27
28
29
33
39
VZ
S/S
OPIN
–
OPIN
+
OPOUT
CHG-ON
MUTE
G-SELECT
SLMODE
VCC
SLREF
IN4
PGND
S/S function
shant
External
power
input
Forced
startup
Zener diode
Reference voltage
startup circuit
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