Ordering number: EN 4385B Monolithic Digital IC LB1843V Low-saturation, current-controlled bidirectional motor driver Overview Package Dimensions The LB1843V is a low-saturation bidirectional motor driver with output current limitation and detection functions. This design is ideal for controlling the loading motor in a video camera. unit : mm 3179A-SSOP20 [LB1843V] Features . Output current limiter and detector built in . Low-saturation voltage bidirectional bridge circuit built in: sat = 0.40 V typ. at 400 mA . VPractically current drain (0.1 µA or less) in standby mode . Input-linkednoreference voltage built in . Thermal shutdown circuit in . Requires little space, sincebuilt few external components are O SANYO : SSOP20 needed and the IC is contained in a small SSOP-20 package Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max 10.5 V Maximum output current Im max 800 mA Applied input voltage Allowable power dissipation VIN Pd max –0.3 to +10 With board ( 50 × 35 × 1.6 mm ) 3 800 V mW Operating temperature Topr –20 to +80 °C Storage temperature Tstg –40 to +150 °C Ratings Unit Allowable Operating Ranges at Ta = 25°C Parameter Supply voltage Symbol Conditions VCC 3.0 to 9.0 VM voltage VM 2.2 to VCC V High-level input voltage VIH 3.0 to 9.0 V Low-level input voltage VIL V –0.3 to +0.7 V LIR input voltage VLIR 0.5 to VCC–1.0 V Output current limitation Ilimit 50 to 350 mA SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN O3096HA(II) No.4385-1/6 LB1843V Electrical Characteristics at Ta = 25°C, VCC = 7.2 V Parameter Reference voltage Symbol ICC0 ICC1 ICC2 Vsat1 Vsat2 Vref Set output current Ilimit Supply current Output saturation voltage Input current RD saturation voltage IIN VRDsat Conditions During standby During bidirectional operation, no load During braking IO = 200 mA (upper side + lower side) IO = 400 mA (upper side + lower side) IVref = 1 mA Resistance between VCC and VM = 1 Ω, when LIR = 2 V VIN = 5 V IO = 1 mA min 1.85 typ 0.1 9 12 0.20 0.40 2.0 max 10 13 18 0.30 0.60 2.15 Unit µA mA mA V V V 165 185 205 mA 90 150 0.3 µA V Allowable power dissipation, Pd max – mW Output current limit is determined by the following equation (Rf is the sensing resistance between VCC and VM): Ilimit = VLIR/10Rf (A) The input range for VLIR is 0.5 to VCC–1.0 (V) Pd max – Ta Specified board (50 × 35 × 1.6 mm3 glass epoxy) Ambient temperature, Ta – °C No.4385-2/6 LB1843V Block Diagram and Sample Application Ciruit Rf = 0.47 to 2 Ω VCC = 3 to 10.5 V 0.001 µF to 0.01 µF Thermal shut down Decoder Limit detection Pin Assignment Notes: . Connect both V pins (motor power supply/sensing pins). . Connect both P-GND pins (motor power supply GND pins). . Connect S-GND (control power M supply GND pin) to the microcontroller’s GND. Top view No.4385-3/6 LB1843V Truth Table Input Output IN1 IN2 OUT1 OUT2 Mode L L off off Standby H L H L Forward L H L H Reverse H H L L Brake Output Current Limitation and Detector Output DEL H L OUT output RD Limit L Non-limit Off Saturated Off Sample Application Timing Chart Sample application timing chart 1 Connect a DC motor (RL = RΩ) between OUT1 and OUT2, and with the RD pin pulled up, input a forward rotation signal (IN1 = high, IN2 = low). Because the output is used in the saturated state at startup, set the DEL input to low. 2 The DC motor starts up, and the startup current (IST = VM/R) flows to the motor. 3 The DC motor rotates in the normal state. At this point, set the DEL input to high. 4 If the DC motor locks, the motor current IM increases to the point of Ilimit (= VLIR/(10Rf)), the output current limiter operates to limit the output current. At the same time, RD is output low from the set current detection circuit. No.4385-4/6 LB1843V Reference voltage (Vref) The Vref output is linked to the input; if either IN1 or IN2 is high, the reference voltage is output. Output current limiter The schematic for the output current limiter is shown below. The output set current is set according to the reference voltage VLIR applied to the LIR pin. When VLIR is applied, 1/10 of that voltage is generated at both ends of RS in the diagram; this voltage is input on the positive (+) side of the current setting amplifier. The motor current IM generates voltage equal to (IM × Rf) at both ends of the external resistor Rf. This voltage is input to the negative (–) side of the same amplifier, and the differential amplifier functions and the output transistors are driven so that these inputs become equal. The set current value in this instance is determined by the following equation: Ilimit = VLIR/(10Rf) [A] Set current detector (1) When DEL = high If the motor current IM has not reached the set current Ilimit, the input voltage on the negative (–) side of the amplifier is greater than the input voltage on the positive (+) side. As a result, the drive current increases and the output PNP transistors reach the saturation state. If this state is detected, the detection signal is sent to the set current detector, and the RD output goes high. If the motor current IM reaches the set current Ilimit, the output PNP transistor enters the controlled state, and the RD output goes low. (2) When DEL = low Because the operation of the current setting amplifier is cancelled when a low signal is input to the DEL pin, the output PNP transistors reach the saturation state and the RD output goes high, just as in the case described above. The following table summarizes the states described above. DEL H L OUT RD limit L Non-limit (saturated) H Saturated H Output Current Limiter and Set Current Detector Block Diagram Set current detector No.4385-5/6 LB1843V IIN – VIN ICC – VCC Bidirectional Input current, IIN – µA Brake Current drain, ICC – mA Rf = 0.5 Ω, no load Set output current, Ilimit – mA VLIR – V VO(sat) – IO Supply voltage, VCC – V VO(sat) – Ta Output saturation voltage, VO(sat) – V Output saturation voltage, VO(sat) – V Input voltage, VIN – V Ilimit – VCC Set output current, Ilimit – mA Supply voltage, VCC – V Ilimit – VLIR Output current, IO – mA Ambient temperature, Ta – °C No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. 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 October, 1996. Specifications and information herein are subject to change without notice. No.4385-6/6