LB1964 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1964

Fan Motor Single-Phase Full-Wave Driver

SANYO -> Panasonic 

Sample Application Circuit

LB1964T

Di

Cr

∗1

∗2

H

∗3

VCC

FG

HB

IN–

OUT1

IN+

OUT2

GND

*1 When a diode is used to protect the IC from destruction in case of reverse connection, the capacitor Cr

must be inserted to provide a regenerative current route. Similarly, a capacitor is needed in the power

supply line, even if no diode is used.

*2 The Hall element is supplied with a constant-voltage bias of approx. 1.27V from the HB pin. This

ensures stable output with good temperature characteristics from the Hall element. Because the

LB1964T incorporates a Hall amplifier with low offset, it provides coil output with a stable duty.

*3 The Hall amplifier does not have a hysteresis characteristic. The OUT1 and IN– pins are at the same

phase, and by 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:

(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 kΩ between OUT1 and IN– to create a hysteresis characteristic.

Block Diagram

FG

VCC

HB

IN+

HALL

IN–

Constant voltage

circuit

Control

circuit

Delay circuit

Delay circuit

Thermal protection

circuit

GND

OUT2

M

OUT1

No. 6188-3/4

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