lb1876 Sanyo Semiconductor Corporation, lb1876 Datasheet - Page 14

• Manufacturer Part Number: lb1876
• Description: Three-phase Brushless Motor Driver For Polygon Mirror Motors
• Manufacturer: Sanyo Semiconductor Corporation

11. Power supply stabilization
12. V
13. Error amplifier circuit components
Since this IC provides a large output current and adopts a switching drive technique, it can easily disrupt the power
supply line voltage. Therefore, capacitors with ample capacitance must be inserted between the VCC pins and ground.
If reverse control mode is selected during braking, the circuit will return current to the power supply. This means that
the power supply lines are even more susceptible to disruption. Since the power supply is most easily influenced during
lock pull-in at high motor speeds, this case requires particular care. Select capacitor values that are fully adequate for
this case.
If diodes are inserted in the power supply lines to prevent damage if the power supply is connected with reverse
polarity, the power supply voltage will be even more susceptible to disruption, and even larger capacitors must be used.
Insert a capacitor of at least 0.1 µF to stabilize VREG, which is the control circuit power supply. The capacitor ground
must be connected as close as possible to the IC control block ground (the GND1 pin).
Locate the error amplifier components as close to the IC as possible to minimize the influence of noise on this circuit.
Locate this circuit as far from the motor as possible.
REG
This catalog provides information as of June, 2002. Specifications and information herein are subject to
change without notice.
stabilization
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
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herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
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mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
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.
LB1876
PS No. 6201-14/14