LB1845 DATASHEET PDF

Usage Notes 1. External diode Since this IC adopts a system based on lower side transistor switching drive, an external diode for the regenerative current that occurs during switching is required between VBB and VOUT. Use a Schottky barrier diode with a low feedthrough current. However, note that if the values of Cc and Rc are too large, the SENSE voltage rise will be slowed, and the current setting will be shifted towards a higher current level.

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It is particularly suitable for driving carriage and paper feed stepping motors in printers and similar products. PWM current control fixed off time scheme? Digital load current selection function? Sustained output voltage: 45V? SANYO Semiconductor assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values such as maximum ratings, operating condition ranges, or other parameters listed in products specifications of any and all SANYO Semiconductor products described or contained herein.

Package Dimensions unit: mm typ C 28 15 R1. Application Circuit Diagram ? The fixed off times are set by the capacitors and resistors connected to these pins. Output current settings The output current is determined by the voltage in the range 1.

Output phase switching inputs. Logic block power supply Internal diode anode connection Outputs Output stage power-supply voltage Set current detection pins.

Connect these pins, fed back through noise filters, to E1 and E2. The set current is controlled by the resistors Re inserted between these pins and ground. Determined by external capacitor and resistor Ct and Rt.

External diode Since this IC adopts a system based on lower side transistor switching drive, an external diode for the regenerative current that occurs during switching is required between VBB and VOUT.

Use a Schottky barrier diode with a low feedthrough current. However, note that if the values of Cc and Rc are too large, the SENSE voltage rise will be slowed, and the current setting will be shifted towards a higher current level.

However, this voltage cannot be set to 0V. The VREF pin input impedance is 26k? The section of the PCB that handles large currents should be designed with a low-impedance pattern, and must be separated from the small signal sections of the circuit. In particular, the ground for the sense resistor Re must be as close as possible to the IC ground. Operation in hold mode There are cases where a current somewhat larger than the current setting may flow in hold mode light load mode.

Since this IC adopts a lower side switching, lower side sense system, the emitter voltage falls and the sense voltage goes to 0 when the switching state goes to off. The circuit then always turns the output on after the toff period has elapsed. At this time, due to the light load, the existence of the time td, and the fact that the output goes on even if the output current is higher than the set current, the output current will be somewhat higher than the set current.

Applications should set the current setting somewhat lower than required if this occurs. Function for preventing the upper and lower outputs being on at the same time This IC incorporates a built-in circuit that prevents the through currents that occur when the phase is switched. Tables 1 and 2 list that control sequence, and Figure 2 and Figure 3 present the composite vector diagram for this sequence. Noise filters No. 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.

In the event that any or all SANYO Semiconductor products including technical data,services described or contained 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.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Semiconductor Co. Information including circuit diagrams and circuit parameters herein is for example only; it is not guaranteed for volume production. SANYO Semiconductor 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 October, Specifications and information herein are subject to change without notice. PS No.

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