
No. 7118-3/6
LB11988N
Truth Table and Control Function
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 VCC is 12 V).
Note: For the Hall inputs, the input “H” state means the state in which the (+)
input for that phase is at least 0.01 V higher than the (–) input for that
phase. Similarly, the “L” state means the state in which the (+) input for
that phase is at least 0.01 V lower than the (–) input for the that phase.
Note: Since this drive system adopts a 180° current application technique,
phases other than the sink and source phase will not necessarily go to
the off state.
Source → sink
Hall input
FR
UV
W
1
V → W
HH
L
H
W → VL
2
U → W
HL
L
H
W → UL
3
U → V
HLH
H
V → UL
4
W → V
LL
H
V → WL
5
W → U
LH
H
U → WL
6
V → U
LHL
H
U → VL
Pin Functions
Pin Assignments
Pin
Pin No.
Pin function
GND
5
Ground for circuits other than the output transistors.
The lowest potential of the output transistors will be that of the RF pin.
FG-OUT
3
FG comparator output
FR
4
Forward/reverse direction switching input
FC
6
Corrects the frequency characteristics of the saturation prevention circuit and the current limiter circuit.
UIN+, UIN–
7, 8
U phase Hall element input. The logic high level indicates the state IN+ > IN–.
VIN+, VIN–
9, 10
V phase Hall element input. The logic high level indicates the state IN+ > IN–.
WIN+, WIN–
11, 12
W phase Hall element input. The logic high level indicates the state IN+ > IN–.
VCC
13
Power supply for IC internal circuits other than the output block.
This voltage must be stabilized so that ripple and noise do not enter the IC.
VS
14
Output block power supply
Output current detection. The current limiter circuit operates using the resistor Rf connected between this pin and ground.
Rf
15
The lower side saturation prevention circuit operates according to the voltage that appears on this pin. Since the saturation
prevention level is set with this voltage, the operation of the low side saturation prevention circuit will become less sensitive if
the value of the resistor Rf is reduced excessively.
UOUT
17
U phase output
VOUT
18
V phase output
(Spark killer diodes are built in the output circuits.)
WOUT
1
W phase output
14
12
10
11
13
9
1
2
3
4
5
6
7
8
NC
W
OUT
15
16
17
18
FG
OUT
FR
GND
FC
U
IN
+
U
IN
—
V
IN
+
V
IN
—
W
IN
+
W
IN
—
V
CC
VS
RF
NC
U
OUT
V
OUT
Top view
LB11988N