lb1964m Sanyo Semiconductor Corporation, lb1964m Datasheet - Page 3

• Manufacturer Part Number: lb1964m
• Description: Miniature 3/5 V Bipolar Drive Fan Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

Block Diagram
Application Circuit Example
*1 When a diode is used to protect the IC from destruction in case of reverse connection, the capacitor Cr must be inserted
*2 The Hall element is supplied with a constant-voltage bias of approx. 1.27V from the HB pin. This ensures stable output
*3 The Hall amplifier does not have a hysteresis characteristic. The OUT1 and IN - pins are at the same phase, and by
(1) Arrange parts layout with priority to proximity of Hall element and IC, to allow short Hall element output wiring.
(2) Insert a resistor of about 10 to 100 kW between OUT1 and IN - to create a hysteresis characteristic.
to provide a regenerative current route. Similarly, a capacitor is needed in the power supply line, even if no diode is
used.
with good temperature characteristics from the Hall element. Because the LB1964M incorporates a Hall amplifier with
low offset, it provides coil output with a stable duty.
arranging the two pins next to each other, chatter during phase switching is prevented. However, if the wiring leading
to the IN - pin is long, some noise interference may occur. In such a case, the following steps should be considered:
HALL
V CC
IN +
IN -
HB
Thermal protection
circuit
Constant voltage
circuit
*1
*3
Control
Di
circuit
*2
H
LB1964M
Cr
Delay circuit
Delay circuit
HB
IN -
IN +
GND
V CC
OUT1
OUT2
FG
GND
OUT2
OUT1
FG
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