LB11985 Sanyo, LB11985 Datasheet - Page 6

• Manufacturer Part Number: LB11985
• Description: VCR Capstan Motor Brushless Motor Driver
• Manufacturer: Sanyo

Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
FRAME GND
RF(POWER)
RF(SENSE)
GSENSE
Symbol
MCOM
W
U
V
VS1
VS2
OUT
OUT
OUT
Pin Voltage
8 V to 15 V
Ground for circuits other than the output transistors.
The lowest potential of the output transistors will be
the that of the RF pin.
Output block power supply
A diode is internally connected between VS1 and
this pin to prevent reverse current flow in half-wave
operating mode.
Ground sensing.
The influence of the common ground impedance on
Rf can be excluded by connecting this pin to the
ground near the Rf resistor in the motor ground lines
that include RF. (This pin must not be left open.)
Output current detection.
Current feedback is applied to the control block by
inserting the resistor Rf between these pins and
ground. Also, both the lower side saturation
prevention circuit and the torque ripple correction
circuit operate according to the voltage on this pin. In
particular, since this voltage sets the oversaturation
prevention level, the lower side oversaturation
prevention operation can be degraded if the value of
this resistor is set too low.
Note that the POWER pin and the SENSE pin must
be connected together.
Coil output
Motor midpoint connection.
Half-wave drive is implemented by connecting the
motor midpoint to this pin.
Description
LB11985H
20
20
50 k
50 k
5
Equivalent circuit
Continued on next page.
VS1
Unit (resistance : Ω )
9
6
7
8
1
2
No. 6209-6/9
A13015
A13016