LB1695D データシートの表示（PDF） - SANYO -> Panasonic

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LB1695D

Three-Phase Brushless Motor Driver for DC Fan

SANYO -> Panasonic 

LB1695D

Description of the LB1695D

1. Hall input circuit

The Hall input circuit is a differential amplifier with a hysteresis of 30 mV (typ.). The operating DC level must be

within the common mode input voltage range (1.5V to VCC – 1.8V). To prevent noise and other adverse influences,

the input level should be at least 3 times the hysteresis (120 to 160 mVp-p). If noise evaluation at the Hall input

shows a problem, a noise-canceling capacitor (about 0.01 µF) should be connected across the Hall input IN+ and

IN– pins.

2. Protection circuits

2-1. Low voltage protection circuit

When the VCC voltage falls below a certain level (VLVSD), the low voltage protection circuit cuts off the

sink-side output transistors to prevent malfunction caused by a VCC voltage drop.

2-2. Thermal shutdown circuit

When the junction temperature rises above a certain value (TSD), the thermal shutdown circuit cuts off the

sink-side output transistors to prevent IC damage due to overheating. Design the application heat

characteristics so that the protection circuit will not be triggered under normal circumstances.

3. FG output circuit

The Hall input signal at IN1, IN2, and IN3 is synthesized and subject to waveform shaping before appearing at this

output. The signal at FG1 has the same frequency as the Hall input, and the signal at FG2 has a frequency that is

three times higher than the Hall input.

4. Forward/Reverse control circuit

This IC is designed under the assumption that forward/reverse (F/R) switching will not be carried out while the

motor is running. If switching is carried out while the motor is running, a feedthrough current flows in the output

and a problem will be caused regarding ASO. F/R switching should be carried out while the VM power supply is

off (motor is stopped).

5. VCC, VM power supply

When the power supply voltage (VCC, VM) rises very quickly at power-on, a feedthrough current may flow in the

output and a problem will be caused regarding ASO. The power supply rise speed should be kept below ∆VCC/∆t =

0.04V/µS and ∆VM/∆t = 0.16V/µS. For the power-up sequence, VCC should be turned on before VM.

The sequence at power-down should be VM first, and then motor stop, and then VCC. With some motors, if VCC is

switched off immediately after VM, while the motor is still rotating due to inertia, the VM voltage may rise and

exceed the withstand voltage.

6. Power supply stabilizing capacitors

If the VCC line fluctuates drastically, the low-voltage protection circuit may be activated by mistake, or other

malfunctions may occur. The VCC line should therefore be stabilized by connecting a capacitor of at least several

µF between VCC and ground. Because a large switching current flows in the VM line, wiring inductance and other

factors can lead to VM voltage fluctuations. As the GND line also fluctuates, the VM line must be stabilized by

connecting a capacitor of at least several µF between VM and ground, to prevent malfunction or exceeding the

withstand voltage. Especially when long wiring runs (VM, VCC, GND) are used, sufficient capacitance should be

provided to ensure power supply stability.

Continued on next page

No. 6205-7/10

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