lb1910 Sanyo Semiconductor Corporation, lb1910 Datasheet - Page 6

• Manufacturer Part Number: lb1910
• Description: Fdd Spindle Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

Continued from preceding page.
Pin No.
10
11
4
5
6
7
8
9
SS
SL
CLK
GND
V
Rf
D
F
C
CC
O
Symbol
L: 0.8 V max
H: 3.5 V min
L: 1.0 V max
H: 3.5 V min
L: 1.0 V max
H: V
Pin voltage
min
CC
– 1.0 V
Equivalent circuit diagram
LB1910
Start/stop mode switching
This is an active-low input.
Rotational speed switching
Reference clock input
A 1-MHz input frequency corresponds to speeds
of 300 and 360 rpm.
• Ground
• This pin, pin 14, and the frame must all be
Power supply
This voltage must be stabilized so that ripple and
noise do not enter the IC.
Output current detection
The output current is detected as a voltage by
connecting the resistor Rf between this pin and
V
the voltage on this pin.
Speed discriminator
Frequency characteristics compensation
Current control system loop oscillation is
prevented by connecting a capacitor between
this pin and ground.
CC
grounded together.
. The current limiter operates by detecting
Function
Continued on next page.
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