LB11988 Datasheet, PDF (3/6 Pages) Sanyo Semicon Device – Refrigerator Fan Motor Driver

Truth Table and Control Functions
Source → sink
V →W
1
W →V
U →W
2
W →U
U →V
3
V →U
W →V
4
V →W
W →U
5
U →W
V →U
6
U →V
Hall input
U
V
H
H
H
L
H
L
L
L
L
H
L
H
LB11988
FR
W
H
L
L
H
L
L
H
H
L
H
H
L
H
H
L
H
L
L
Note: The "H" state for FR is defined as a voltage of 8 V or
higher, and the "L" state for FR is defined as a voltage of
4 V or lower. (When V_CC = 12 V.)
Note: For the Hall inputs, the input high state is defined to be the
state where the (+) input is higher than the corresponding
(–) input by 0.01 V or higher, and the input low state is
defined to be the state where the (+) input is lower than
the corresponding (–) input by 0.01 V or higher.
Note: Since this drive technique is a 180° current application
scheme, the phases other than the sink and the source
phases will not turn off.
Pin Functions
Pin No.
Pin
5
3
4
6
7, 8
9, 10
11, 12
13
14
GND
FG-OUT
FR
FC
U_IN+, U_IN–
V_IN+, V_IN–
W_IN+, W_IN–
V_CC
V_S
15
Rf
17
U_OUT
18
V_OUT
1
W_OUT
Function
Ground for circuits other than the output transistors.
Note that the Rf pin will be at the lowest potential of the output transistors.
This is the FG amplifier output pin. Internally, it is a resistive load.
Forward/reverse switching pin
Corrects the frequency characteristics of the saturation prevention circuit loop and current limiter circuit.
U-phase Hall input. Logic high refers to the state where IN+ > IN–.
V-phase Hall input. Logic high refers to the state where IN+ > IN–.
W-phase Hall input. Logic high refers to the state where IN+ > IN–.
Power supply provided to all IC internal circuits other than the output block.
This voltage must be stabilized so that ripple and noise do not enter the IC.
Output block power supply
Used for output current detection. The current limiter circuit operates using the resistor (Rf) connected between
this pin and ground.
Note that the lower side saturation prevention circuit operates according to the voltage that appears on this pin.
Since the over-saturation level is set by this voltage, the response of the lower side saturation prevention circuit
may be degraded in the large current region if the value of Rf is made extremely small.
U-phase Hall output
V-phase Hall output
W-phase Hall output
(These pins include internal spark killer diodes.)
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