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| Ordering number : ENN6518 Monolithic Linear IC LA6538T Single-Phase Full-Wave Fan Motor Driver Overview The LA6538T is optimal for use as a fan motor driver in equipment, such as notebook personal computers and electronic game units, that requires miniaturization and low noise levels. This device achieves highly efficient single-phase bipolar fan motor drive by providing a low saturation voltage BTL output. * Ultraminiature package (MSOP-8: 3.0 x 4.9 x 0.93 mm3) -- Allows the circuit board to be miniaturized and a large heat sink to be used. Reference materials: T package (MSOP-8) series fan motor drivers LB1964T: 3 and 5 V operation, low saturation voltage switching single-phase bipolar drive, FG output LB11963T: 5 and 12 V operation, switching singlephase bipolar drive, restart circuit, lock detection, 1/2 FG output LB11964T: 5 and 12 V operation, switching singlephase bipolar drive, restart circuit, lock detection, FG output Functions and Features * BTL output single-phase full-wave linear drive (gain resistance: 180 to 500 k, 360x) -- Since this device generates no switching noise, it is optimal for fan drive in audio equipment, electronic games, and notebook personal computers. * Supports low-voltage operation and features a wide usable voltage range (VCC = 2.5 to 9.5 V). * Low saturation voltage output (Upper side + lower side saturation voltage: VOsat(total) = 0.2 V (typ), IO = 100 mA) -- This device achieves a high coil efficiency for low current drain, and generates minimal heat in the IC itself. * Constant-voltage Hall bias output. -- The Hall element is regulated at 2.1 V, and the device provides a stable Hall output with excellent temperature characteristics. * FG output -- The LA6538T provides a speed detection output (an open-collector output). * Built-in thermal protection circuit -- This circuit limits the drive current to prevent damage to or destruction of the IC when the IC chip temperature exceeds 180C due to excessive output current caused by load shorting or other problem. Package Dimensions unit: mm 3245-MSOP8 [LA6538T] 3.0 8 5 0.5 0.65 (0.5) 1 4 0.25 (0.85) 1.1max 0.25 0.08 3.0 4.9 SANYO: MSOP8 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 Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 83000RM (OT) No. 6518-1/6 LA6538T Pd max -- Ta Specified printed circuit board: 20.0 x 10.0 x 0.8 mm3 Paper phenolic board Mounted on the specified printed circuit board 400 600 Allowable power dissipation, Pdmax -- mW 500 300 200 192 100 0 --20 0 20 40 60 80 100 ILA00211 Ambient temperature, Ta -- C Specifications Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Allowable power dissipation OUT pin output current OUT pin output voltage handling FG output voltage handling FG output current Operating temperature Storage temperature Symbol VCC max Pd max IOUT max VOUT max VFG max IFG max Topr Tstg Mounted on the specified printed circuit board* Conditions Ratings 10 400 0.3 9.5 10 5 -20 to +90 -55 to +150 Unit V mW A V V mA C C Note: * Specified printed circuit board: 20.0 x 10.0 x 0.8 mm3 paper phenolic board, wiring density: 20%. Recommended Operating Conditions at Ta = 25C Parameter Supply voltage Hall input common-mode input voltage range Symbol VCC VICM Conditions Ratings 2.5 to 9.5 0.9 to VCC - 1 Unit V V Electrical Characteristics at Ta = 25C, VCC = 5 V Parameter Circuit current OUT pin output low-level voltage OUT pin output high-level voltage Hall bias voltage Hall amplifier gain Hall amplifier input resistance FG output low-level voltage FG output leakage current Thermal protection circuit Symbol ICC VOL VOH VHB VG VINR VFG IFGL T-TSD IFG = 3 mA VFG = 7 V Design guarantee* 150 180 Conditions IN- = 2.6 V, IN+ = 2.4 V, RL = IO = 100 mA IO = 100 mA RH = 360 + 91 1.9 47 400 Ratings min typ 10 0.1 0.1 2.1 50 500 0.2 max 15 0.2 0.2 2.3 53 620 0.3 30 200 Unit mA V V V dB V A C Note: * Design guarantee: Indicates a design target value. These parameters are not tested in the independent IC. Truth Table IN- H L -- IN+ L H -- OUT1 H L off OUT2 L H off FG L off -- Mode Motor operating Thermal protection activated No. 6518-2/6 LA6538T Pin Assignment IN+ 1 8 FG HB 2 7 VCC LA6538T IN-3 6 OUT2 OUT1 4 Top view 5 GND ILA00206 Sample Application Circuit Di VCC Cr VCC *4 *3 FG HB R2 *1 *2 H IN-OUT1 H IN+ R1 OUT2 R2 GND Devices on the printed circuit board ILA00207 ILA00208 Notes: 1. When the diode Di is used to prevent device destruction from reverse connection, the capacitor Cr must be inserted to assure a path for regenerative currents. Similarly, if there are no nearby capacitors on the fan power supply line, the capacitor Cr is also required to increase reliability. 2. The Hall element is biased at a constant voltage of approximately 2.1 V from the HB pin. Thus the LA6538T provides a stable Hall output with excellent temperature characteristics. The resistor R1 adjusts the Hall output amplitude. The LA6538T implements linear drive by amplifying the Hall output and applying voltage control to the motor coils. Startup characteristics and efficiency are improved by using a higher Hall device output. However, the motor can be made to operate more quietly by adjusting the Hall device. 3. If the Hall bias is taken from VCC, bias the Hall device at 1/2 VCC as shown in the figure. 4. This pin must be left open if unused. Block Diagram VCC FG 2.1 VRG 180 k 180 k HB IN+ H 500 OUT1 OUT2 500 IN-- GND ILA00209 No. 6518-3/6 LA6538T Timing Chart Hall Signal OUTPUT Coil Current FG Pulse ILA00210 No. 6518-4/6 LA6538T ICC -- VCC Output saturation voltage, VO(sat) -- V IN-- = IN+ = HB -- = L IN 18 16 0.7 VO(sat) -- IO T1 ( N PN VCC = 8.5 V U 0.6 Current drain, ICC -- mA 14 12 10 8 6 4 2 0 0 2 NP ) OU to ta l 0.5 O 0.3 0.2 OU (P T1 NP ) 0.1 0 4 6 8 10 12 ILA00212 0.6 0 100 200 300 OU + =L IN T2 0.4 T2 IN-- = IN+ = 1/2 VCC (N PN ) 400 ILA00213 Supply voltage, VCC -- V 0.6 Output current, IO -- mA VO(sat) -- IO Output saturation voltage, VO(sat) -- V OUT2 pnp (upper side) VO(sat) -- IO OUT1 npn (lower side) Output saturation voltage, VO(sat) -- V (P ) V N5 0 100 0.5 0.4 0.3 0.2 0.1 0 0.5 0.3 PN P5 V 0.4 PN P8 0.2 0.1 0 0 100 200 300 400 ILA00214 PN P 3V NP N3 V 200 NP 300 NP V N8 400 ILA00215 9 10 ILA00217 30 40 ILA00219 Output current, IO -- mA Output current, IO -- mA 0.6 FG Threshold Level VCC = 5 V VFG(sat) -- IFG Saturation voltage, VFG(sat) -- V 0.5 0.4 FG = "H" VFG H 0.3 0.2 9V 0.1 5V 3V FG = "L" L 0 1 2 3 ILA00216 6 0 0 1 2 3 4 5 6 7 8 Output voltage, VOUT2 -- V 2.8 FG supply current, IFG -- mA VHB -- IHB VCC = 5 V Gain Characteristics VCC = 5 V 1/2 VCC bias 2.4 Hall bias voltage, VHB -- V 9V 5V 5 2.0 Output voltage, VO -- V 3V 4 1.6 3 1.2 2 0.8 0.4 0 0 2 4 6 8 10 ILA00218 1 0 --40 --30 --20 --10 0 10 20 Hall bias current, IHB -- mA (IN--) -- (IN+) -- mV V No. 6518-5/6 LA6538T 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 or all SANYO 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 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 August, 2000. Specifications and information herein are subject to change without notice. PS No. 6518-6/6 |
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