LB1869M Просмотр технического описания (PDF) - SANYO -> Panasonic
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LB1869M Datasheet PDF : 5 Pages
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LB1863M, 1869M
4. Output protection function (C pin)
This pin connects the capacitor that forms the automatic recovery circuit. If rotation stops due to, for example, a
motor overload, the pin voltage rises and the output stops. The system automatically recovers from stopped to drive
mode when the load is set to an appropriate level. The lock detection time can be set by changing the value of the
capacitor.
For a 1-µF capacitor:Lock detection time
About 2 seconds
Lock protection time (output on) About 1 second
(output off) About 6 seconds
Automatic recovery circuit pin C voltage
While the blades are turning, the capacitor is charged with a current of about 3 µA (typical), and C is discharged by
pulses that correspond to the motor speed.
When the blades lock, the capacitor is no longer discharged, and the voltage across the capacitor increases. The
output is turned off when that voltage reaches 0.8 × VIN.
When the output is turned off, the capacitor is discharged at a current of about 0.44 µA (typical). When the
capacitor voltage falls under VTH2, if the lock state is not yet cleared the capacitor continues discharging until
VTH1. (Note that the output is turned on at this time.) These operations, i.e. items and , are repeated with a
ton:toff ratio of about 1:6 to protect the motor.
{If the lock state has been cleared when the capacitor voltage reaches VTH2, motor rotation is started by turning the
output on.
5. Rotation detection signal (RD pin)
This is an open collector output, and outputs a low level in drive mode and a high level when the motor is stopped.
6. Radio-frequency noise reduction function (B1 and B2 pins)
These are base pins for Darlington pair outputs. Add capacitors of about 0.01 to 0.1 µF if radio-frequency noise is a
problem.
7. Thermal shutdown function
Turns off the output in response to coil shorting or IC overheating.
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of January, 1997. Specifications and information herein are subject to
change without notice.
No. 4943-5/5
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