LB1860 Просмотр технического описания (PDF) - ON Semiconductor

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LB1860

Two-Phase Half-Wave Variable Speed Fan Motor Driver

ON Semiconductor 

LB1860, LB1860M, LB1861, LB1861M

..(5) Output protection function (C pin)

Capacitor pin used in forming an automatic return circuit.

If rotation is stopped due to overload, the pin voltage level increases and then forces the output to become inactive. In this case,

after proper load adjustment, the output returns to the ‘drive’ mode from the ‘stop’ mode automatically. By changing the

capacitor value, the lock detect time period can be set.

For C marked with 1 μF

Lock detect time

Lock protect time (output ON)

(output OFF)

Approximately 2 sec.

Approximately 1 sec.

Approximately 6 sec.

Rotation Output ON

Lock

Output OFF

Output

ON

Output OFF

Lock release

Automatic Return Circuit C Pin Voltage

Rotation

1 When a fan is rotating, the capacitor is charged at 4 μA (typ) and discharged through the C with pulses according to the

rotational speed.

2 When a fan is locked, no discharge occurs through the C and the C voltage rises, turning OFF the output at 0.8  VIN.

3 When the output is turned OFF, discharge occurs through the C at 0.5 μA (typ). If the lock is not released when the C voltage

drops to VTH2, the capacitor is charged to VTH1 again. (At this moment, the output is turned ON.) These operations 2 and

3 repeated at a cycle of approximately ton : toff = 1:6 protect a motor.

4 If the lock is released when the C voltage drops to VTH2, the output is turned ON, starting rotation.

.(6) Rotation detect signal (RD pin)

Open collector output (Drive mode: ‘‘L’’, Stop mode: ‘‘H’’)

..(7) Radio noise reducing (Pins B1, B2)

Base pin of Darlington connection output transistor

If radio noises need to be processed properly, the following actions should be taken:

1 Connect a capacitor of 0.01 μ to 0.1 μF between B1 and B2.

2 Connect a capacitor of 0.001 μ to 0.01 μF between OUT and B.

If output causes oscillation, add a resistor of 200  to 1 k in series with a capacitor.

.(8) Thermal shutdown function

Shutdown the driver output in case of coil short-circuiting and abnormal IC heating.

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