LB1669M Sanyo, LB1669M Datasheet - Page 4

• Manufacturer Part Number: LB1669M
• Description: 2-Phase Unipolar Brushless Motor Driver
• Manufacturer: Sanyo

Sample Application Circuit 2 Output Waveform Diagram
Truth Table
Design Notes (See Sample Application Circuits.)
(1) Supply Voltage (V
(2) Hall input pin voltage (IN– and IN+ pins)
(3) Output transistors (OUT1 and OUT2 pins)
The LB1669 series have the internal parallel regulator which supplies power to the Hall amplifier circuit and the control
block. Therefore, the driver ICs are not affected by power source fluctuations and kickbacks from the motor. They maintain
the stable operations even if noise signals such as surge are generated.
Set the resistance R1 between V
supply voltage range of a fan motor.
V
The current flowing into V
.
IN– and IN+ are input pins for the Hall element output. Set the Hall element output voltage to within the range of 0 V to V
– 1.5 V.
The gain between the Hall input pin and the output pin is 100 dB or greater. The offset voltage of the Hall input amplifier is
Output current I
Output saturation voltage V
The LB1669 requires one of the three types of output protection.
1 When external capacitors are connected between OUT and GND, the capacitance should not exceed 10 µF. Use
2 When external Zener diodes are connected, use one that will have a cutoff voltage of 40 V or less. If radio noise is a
3 When external capacitors are connected between OUT and B, use one that will hold kickback voltage to 40 V or less.
7 mV therefore, the Hall element output must be set with the offset voltage ( 7 mV) considered.
IN
Consideration given to surge voltage
The maximum allowable current at V
capacitance that will hold kickback voltage and back voltage to 60 V or less.
problem, insert a capacitor of 0.01 to 0.1µF between B1 and B2.
If it oscillates, insert resistance in series with the capacitor.
IN+
is 6.7 V typ at I
H
H
L
L
I
Vsurge = V
CC
=
O
V
CC
= 1.5 A max.
IN
IN
R1
CC
pin)
– V
+ R1
= 7 mA.
IN
IN–
H
H
L
L
IN
O
is calculated using the equation shown below.
200 mA . . . . . . (2)
sat = 1.15 V/1.0 A (typ.)
. . . . . . . (1)
CC
and V
IN
IN
pin is 200 mA, so the withstand voltage level is designed as follows.
so that the I
C
H
H
L
L
LB1669, 1669M
CC
current of 6 mA to 50 mA can flow into the V
OUT1
H
H
H
L
OUT2
H
H
H
L
IN
pin within the
No.3513-4/5
IN