LB1841V

Ordering number : ENN4384A LB1841V Monolithic Digital IC LB1841V Low-Saturation Current-Controlled Forward/Reverse Motor Driver Overview The LB1841V is a low-saturation current-controlled forward/reverse motor driver with provision for a constant voltage circuit using an external transistor and an output current limiter function. Its design is optimized for use in video camera loading motors. Package Dimensions unit: mm 3179A-SSOP20 [LB1841V] 20 11 4.4 Features • Built-in output current limiter and detector circuit • Built-in low-saturation voltage forward/reverse bridge circuit: VOsat = 0.40V typ. at 400 mA • Little current drain in standby mode (up to 0.1 µA) • Built-in low-saturation constant voltage circuit using an external pnp transistor • Built-in reference voltage linked to input • Built-in thermal shutdown circuit • Low external parts count. Compact SSOP-20 package allows space saving design. 1 6.7 10 1.6max 0.15 0.22 0.65 0.43 0.1 SANYO : SSOP20 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Maximum output current Applied input voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Im max VIN Pd max Topr Tstg Conditions Ratings 10.5 800 –0.3 to +10 800 –20 to +80 –40 to +150 Unit V mA V mW °C °C With substrate (50 × 35 × 1.6 mm3) 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 73099RM(KI) No. 4384-1/7 0.5 6.4 1.0 LB1841V Allowable Operating Ranges at Ta = 25°C Parameter Power supply voltage Input High voltage Input Low voltage SVR input voltage LIR input voltage Output current limiter Symbol VCC VIH VIL VSVR VLIR I limit Conditions Ratings 3.0 to 9.0 3.0 to 9.0 –0.3 to 0.7 1.0 to VCC–0.2 0.5 to VCC–1.0 50 to 350 Unit V V V V V mA Electrical Characteristics at Ta = 25°C, VCC = 7.2V Parameter Power supply current Symbol ICC 0 ICC 1 ICC 2 Vsat 1 Vsat 2 Vref I limit IIN IPBC VS VRDsat Conditions In standby mode Forward/reverse No load In brake mode IO = 200 mA (upper side + lower side) IO = 400 mA (upper side + lower side) IVref = 1 mA VS-VM resistance = 1Ω at LIR = 2V VIN = 5V min Ratings typ 0.1 9 12 0.20 0.40 1.85 2.0 165 185 90 2.55×VSVR IO = 1 mA 0.3 max 10 13 18 0.30 0.60 2.15 205 150 –10 Unit µA mA mA V V V mA µA mA V V Output saturation voltage Reference voltage Current limiter characteristics Input current PBC drive current Vs output voltage RD saturation voltage Constant-voltage output VS is determined by the equation VS = 2.55 × VSVR. The input range of VSVR is 1.0 to 4 V. When VS ≥ VCC, the output will be saturated. The output current limiter value is determined according to the following equation (Rf is a sensing resistor across VS and VM). I limit = VLIR/10 Rf(A) VLIR input range is 0.5 to VCC –1.0 (V). Block Diagram and Sample Application Circuit VCC = 3 to 10.5V 10µF Vcc PBC VS VS = 5.1V 10µF VM Rf = 0.47 to 2Ω SVR OUT1 0.001µF to 0.01µF OUT2 P-G Thermal shutdown DECODER Vref = 2.0V Limit detection M LIR RD S-G IN1 IN2 DEL No. 4384-2/7 LB1841V Pin Assignment P-GND OUT1 OUT1 VM VM VS 1 2 3 4 5 6 7 8 9 20 P-GND 19 OUT2 18 OUT2 17 LIR LB1841V 16 SVR 15 DEL 14 IN2 13 IN1 12 RD 11 S-GND (Top view) Note) • VM (motor power supply/sensing pin) are both connected. • P-GND (motor power supply GND pin) are both connected. • S-GND (control power supply ground pin) is connected to microprocessor ground. PBC VCC Vref NC 10 Truth Table Bridge and VS circuits Input IN1 IN2 L L H L L H H H Output OUT2 off L H L Mode Standby Forward rotation Reverse rotation Brake OUT1 off H L L VS off H H off Output current limiter and detection output DEL OUT output RD H L limit Non-limit Saturation L off off Pd max – Ta 1000 Allowable power dissipation, Pd max – mW Specified substrate (50×35×1.6 mm3, glass epoxy) 800 600 400 200 0 –20 0 20 40 60 80 100 Ambient temperature, Ta – °C No. 4384-3/7 LB1841V Sample Application Timing Chart V(V) IN1 IN2 DEL VM R IO G VLIR 10Rf OUT1 OUT2 RD 1 2 3 4 t (s) • Sample Application timing chart 1 Connect DC motor (RL = RΩ) between OUT1 and OUT2, and input forward signal (IN1 = High, IN2 = Low) with RD pin in pull-up state. Because output is saturated during startup, set DEL input to Low. 2 DC motor starts and startup current (IST = VM/R) flows through motor. 3 DC motor rotates in normal condition. At this point, set DEL input to High. 4 When DC motor locks up, motor current IM increases. When it reaches Ilimit (=VLIR/(10 Rf)), output current limiting circuit operates. At the same time, the set current detection circuit sets RD output to Low. • Reference voltage Vref The Vref output is linked to the input. When IN1 or IN2 is High, the reference voltage is output. • Output current limiter circuitry The circuit configuration is as shown in the separate diagram. The output set current is determined by the reference voltage VLIR applied to the LIR pin. When VLIR is applied, 1/10 of the voltage occurs across RS in the diagram. This voltage is input to the + side of the voltage setting amplifier. The motor current IM generates a voltage (IM × Rf) across the external resistor Rf. This voltage is input to the – side of the amplifier. The differential amplifier operates so as to make the two inputs equal, then the output transistor is driven. The set current is determined by the following equation: Ilimit = VLIR/(10Rf) [A] No. 4384-4/7 LB1841V • Set current detection circuit (1) When DEL = High When the motor current IM is below the set current Ilimit, the input voltage (IM × Rf) at the – side of the current setting amplifier is smaller than the input voltage at the + side (larger vs. ground). The drive current therefore increases and the output pnp transistor saturates. When this condition is detected, a signal is sent to the set current detection circuit and the RD output becomes High. When the motor current IM reaches the set current Ilimit, the output pnp transistor is in the controlled state and the RD output becomes Low. (2) When DEL = Low When a Low signal is input to the DEL pin, operation of the current setting amplifier is canceled. Therefore as described above, the output transistor saturates and the RD output becomes High. The above conditions are shown in the table below. DEL H L OUT limit Non-limit (saturation) Saturation RD L H H Output Current Limiter and Setting Current Detection Circuits Block Diagram Rf VCC VCC PBC VS VM RS LIR IM VLIR 10RS P-G M Setting current detection circuit RD DEL No. 4384-5/7 LB1841V 16 14 ICC – VCC LIR = SVR = Vref VIN = 5.0V Rf = 0.5Ω, no load 240 IIN – VIN VCC = 8.0V Brake Input current, IIN – µA 200 Current drain, ICC – mA 12 10 8 6 4 2 0 160 DEL = L DEL = H Forward/ reverse 120 80 40 0 1 2 3 4 5 6 7 8 9 10 11 12 0 0 1 2 3 4 5 6 7 8 9 10 11 Power supply voltage, VCC – V 6 Input voltage, VIN – V 10 VS – VCC VIN = 5.0V SVR = Vref Forward/reverse VS – VSVR VCC = 8.0V VIN = 3.0V LIR = Vref 5 VS output voltage, VS – V 4 VS output voltage, VS – V 0 1 2 3 4 5 6 7 8 9 10 11 8 6 3 4 2 1 2 0 0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 Power supply voltage, VCC – V 600 SVR input voltage, VSVR – V 400 I limit – VLIR VCC = 6.0V SVR = Vref RL = 10Ω I limit – VCC SVR = Vref VIN = 3.0V RL = 10Ω Rf .. 0.5Ω = Output set current, I limit – mA Output set current, I limit – mA 500 Ilimit = 300mA 300 400 5Ω 300 R f= 200mA 200 0. 200 1.0 Ω 100mA 100 100 0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 0 0 1 2 3 4 5 6 7 8 9 10 11 VLIR – V 0.6 Power supply voltage, VCC – V 0.4 VO(sat) – IO Output saturation voltage, VO(sat) – V VO(sat) – Ta VCC = 6.0V VIN = 3.0V LIR = SVR = Vref DEL = L Output saturation voltage, VO(sat) – V 0.5 VCC = 6.0V VIN = 3.0V LIR = SVR = Vref DEL = L 0.3 I O = 40 0mA 0.4 0.3 0.2 200mA 0.2 0.1 0.1 0 0 100 200 300 400 500 600 700 800 900 0 –40 –20 0 20 40 60 80 100 120 Output current, IO – mA Ambient temperature, Ta – °C 140 160 No. 4384-6/7 LB1841V 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 July, 1999. Specifications and information herein are subject to change without notice. PS No. 4384-7/7