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Ordering number:EN4948A
Monolithic Digital IC
LB1894M
3-Phase Brushless Motor Driver for CD-ROM Spindle Motors
Overview
The LB1894M is a 3-phase brushless motor driver for use in CD-ROM spindle motors.
Package Dimensions
unit:mm 3073A-MFP30S
[LB1894M]
Function and Features
* 3-phase bipolar brushless motor driver. * Voltage linear drive, enabling the external capacitance to be reduced. * Thermal shutdown circuit built-in. * Overcurrent protection circuit built-in. * V-type control amplifier built-in. * 2-step switching control gain. * Control gain switchable using operational amplifier.
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Output supply current Output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC1 max VCC2 max VOU, V, W IOUT Pd max Topr Tstg Conditions
SANYO : MFP30S
Ratings 20 7.0 22 1.5 1.05 -20 to +75 -55 to +150
Unit V V V A W C C
Allowable Operating Ranges at Ta = 25C
Parameter Supply voltage Symbol VCC1 VCC2 Conditions Ratings 5 to 18 4.3 to 6.5 Unit V V
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO 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 products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquaters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
93098HA (KT)/70695TH (ID) No.4948-1/7
LB1894M
Electrical Characteristics at Ta = 25C, VCC1=12V, VCC2=5V
Parameter Supply current [Driver stage] Output saturation voltage Output transistor blocking voltage Output rest voltage Hall amplifier input offset voltage Hall amplifier input bias current Hall amplifier common-mode input voltage range Hall amplifier input-output voltage gain [Control stage] Control-output drive gain Control-output channel difference Control rising threshold voltage Control rising threshold voltage width Gain control switching high-level voltage Gain control switching low-level voltage [Op-amplifiers] Op-amplifier intput offset voltage Open-loop voltage gain Source output saturation voltage Sink output saturation voltage Common-mode signal rejection Op-amplifier common-mode input voltage range Phase margin [Thermal shutdown] Thermal shutdown operating temperature TSD hysteresis TSD TSD Design value Design value 150 180 15 210 VFG offset GVFG VFG OU VFG OD CHR VFG CH M -8 f=1kHz IO=-2mA IO=2mA Design value VCREF=1.5V to VCC2, design value Design value 0 20 80 +3.5 3.7 1.3 60 +8 mV dB V V dB V deg GVCO1 GVCO2 GVCO VCTH VCTH VGCH VGCL Inputs are low level when left open VCREF=2.5V, VOUT=0.1Vp-p VCREF=2.5V, VOUT=0.1Vp-p High gain, GC=high Low gain, GC=low 32 26 -2 2.35 50 4 0 35 29 38 32 +2 2.65 150 5 +2 dB dB dB V mV V V VO(sat)1 VO(sat)2 VO(sus) VOQ VH offset IH bias VHch GVHO IOUT=0.5A, sink+source IOUT=1.0A, sink+source IOUT=20mA, design value VC=VCREF 20 5.7 -5 1 1.3 42 45 6.0 6.3 +5 5 2.2 48 1.6 2.0 2.2 3.0 V V V V mV A V dB Symbol ICC 1 ICC 2 Conditions VC=VCREF, RL= VC=VCREF Ratings min typ 17 6.5 max 30 9.5 Unit mA mA
C C
Pin Assignment
(Top view)
No.4948-2/7
LB1894M
Truth Table
Source Sink 1 2 3 4 5 6 W-phase V-phase V-phase W-phase W-phase U-phase U-phase W-phase V-phase W-phase W-phase V-phase U-phase V-phase V-phase U-phase V-phase U-phase U-phase V-phase U-phase W-phase W-phase U-phase Hall Input UIN HIGH HIGH LOW LOW HIGH LOW VIN HIGH LOW LOW HIGH LOW HIGH WIN LOW LOW HIGH LOW HIGH HIGH Control VC HIGH LOW HIGH LOW HIGH LOW HIGH LOW HIGH LOW HIGH LOW
An input is considered to be HIGH when UIN1 > UIN2, VIN1 > VIN2, and WIN1 > WIN2 by 0.2V more, and is considered to be LOW when UIN1 > UIN2, VIN1 > VIN2, and WIN1 > WIN2 by 0.2V or less.
No.4948-3/7
LB1894M
Block Diagram 1
Block Diagram 2
No.4948-4/7
LB1894M
Pin Functions
Pin No. 1, 2, 14, 15, 16, 17, 29, 30 Symbol FRAME (GND) Pin voltage Equivalent circuit Function
* Ground connection for all circuit except the outputs.
3
FC
* Connect a capacitor between this pin and ground to reduce the control input-output gain frequency response and to stop the oscillator.
4
VCREF
1.5V min VCC2 max * Speed control pins. Pin 4 voltage determines the control start voltage. Pin 5 voltage is used to control the output voltage (voltage control method). 0V min VCC2 max
5
VC
6
VCC 1
5 to 18V
* Output-stage supply pin.
7 8 9
UOUT VOUT WOUT
* Output pins.
10
Rf
11
VCC 2
4.3 to 6.5V
* Output transistor ground. A resistor can be connected between this pin and GND to sense the output current as a voltage drop to provide for overcurrent protection. * Supply for all circuits except the output stage. This supply should be kept stable to prevent ripple and noise from sntering this pin.
Continued to next page.
No.4948-5/7
LB1894M
Pin No. Symbol Pin voltage Equivalent circuit Function
* When the voltage on Rf pin becomes equal to the voltage on pin 12 (CL), the current limiter operates. The pin 12 (CL) voltage is determined externally. If the current limiter is not used, it should be connected to VCC2 12 CL 0V min VCC2 max
13
GC
0V min VCC2 max
* Control input gain switching pin. 35dB is selected when pin 13 (GC) is HIGH (4 to 5), and 29dB is selected when pin 13 (GC) is LOW (0 to 2V) or open for a value VCC2=5V.
18
ROUT
* A resistor connected between this pin and pin 20 (VCIN) enables pin 22 switching between HIGH level and open to switch the op-amplifier gain.
19
VCOUT
* Op-amplifier output pin. This op-amplifier can be used for : 1. Control gain changing, or 2. FG amplifier.
22
RIN
* When this pin goes HIGH, the resistor connected between pins 18 and 20 is connected in parallel with the op-amplifier feedback resistor to switch the gain.
20
VCIN
0V min 3.5V max (VCC2=5V)
* Op-amplifier inverting input pin. The op-amplifier non-inverting input is connected to pin 4 VCREF
Continued to next page.
No.4948-6/7
LB1894M
Pin No. Symbol Pin voltage Equivalent circuit Function
23 24
WIN 2 WIN 1
* W-phase Hall element input pins. Logic HIGH is represented by WIN1 > WIN 2.
25 26
VIN 2 VIN 1
1.3V min 2.2V max
* V-phase Hall element input pins. Logic HIGH is represented by VIN1 > VIN 2.
27 28
UIN 2 UIN 1
* U-phase Hall element input pins. Logic HIGH is represented by UIN1 > UIN 2.
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. In the event that any and all SANYO products described or contained herein fall under strategic products (including services) controlled under the Foreign Exchange and Foreign Trade Control Law of Japan, such products must not be exported without obtaining export license from the Ministry of International Trade and Industry 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 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.
This catalog provides information as of September, 1998. Specifications and information herein are subject to change without notice.
PS No.4948-7/7

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