LB1695 查看數據表（PDF） - SANYO -> Panasonic

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LB1695

Three-Phase Brushless Motor Driver

SANYO -> Panasonic 

Block Diagram and Peripheral Circuits

LB1695

LB1695 Functional Description

1.Hall element input circuits

The Hall element input circuits are differential amplifiers with a hysteresis of about 30 mV (typical). The operating DC

level must be within the common-mode input voltage range (1.5 V to VCC – 1.8 V). We recommend providing input

levels that exceed the hysteresis by at least a factor of three (120 to 160 mVp-p) to assure that circuit operation is not

affected by noise. If the ability to withstand noise is determined to be a problem during noise evaluation or other

testing, insert capacitors (of about 0.01 µF) between the Hall input IN+ and IN– pins.

2.Protection circuit

2.1 Low-voltage protection circuit

The sink side output transistors are turned off if the VCC voltage falls below the stipulated voltage (VLVSD). This

circuit prevents incorrect operation when the VCC voltage is reduced.

2.2 Thermal shutdown circuit

The sink side output transistors are turned off if the junction temperature exceeds the stipulated temperature (TSD).

This circuit prevents the IC from being destroyed by overheating. Applications must be designed so that this circuit

does not operate except in unusual situations.

3.FG output circuit

The LB1695 combines the IN1, IN2, and IN3 inputs and then wave shapes the combined signal. The FG1 output has

the same frequency as the Hall inputs, and the FG2 output has a frequency three times that of the Hall inputs.

4.Forward/reverse control circuit

This circuit was designed with the assumption that the direction will not be switched from the F/R pin while the motor

is turning. If the direction is switched while the motor is turning, through currents will flow in the output and ASO will

become a problem. We recommend only using F/R switching when the VM power supply is in the off state, i.e. with the

motor in the stopped state.

5.VCC and VM power supplies

If the speed with which the power-supply voltages (VCC and VM) rise when power is first applied is too fast, through

currents will flow in the output and ASO will become a problem. Applications must assure that the power supply rise

speeds do not exceed 0.04 V/µs (∆VCC/∆t) and 0.16 V/µs (∆VM/∆t). When applying power, it is desirable to apply

VCC first and then apply VM. When turning the power off, it is desirable to first turn off VM, then to wait for the motor

to stop, and only then turn off VCC. If VCC is turned off after VM is turned off but while the motor is still turning due to

No. 5678-5/7

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