LB1943 SANYO | Alldatasheet

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Technical content

The LB1943 is a forward/reverse motor driver IC. This IC supports forward, reverse, and braking control from a single input, and the desired output voltage can be set with a resistor. Either full drive or VC drive can be selected from the single input, and the LB1943 can be controlled from a microprocessor. Functions

  • Single-input control of forward, reverse, and braking operations
  • Resistor output voltage setup
  • Either full drive or VC drive can be selected from the single control input.
  • Can be controlled from a microprocessor.
  • Built-in motor dash current absorbing device
  • Built-in reference voltage circuit
  • Built-in thermal protection circuit Package Dimensions unit: mm 3043A-SIP10 Monolithic Digital IC 22898HA (OT) No. 5806-1/5 SANYO: SIP10 [LB1943] SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN Forward/Reverse Motor Driver with Braking Function LB1943 Parameter Symbol Conditions Ratings Unit Maximum supply voltage V CC max 18 V Input voltage V IN VCC ‡ VIN –0.3 to +6 V Output current I OUT ±1.6 A Allowable power dissipation Pd max 1.2 W Operating temperature Topr –25 to +75 °C Storage temperature Tstg –55 to +125 °C Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage range VCC 1 8 to 18 V VCC 2V CC 1 ‡ VCC 2 5 to 18 V Forward-reverse disabled time Toff Over 20 µs Allowable Operating Ranges at Ta = 25°C Parameter Symbol Conditions Ratings Unit min typ max Input low-level voltage V INL 01 V Input high-level voltage V INH 4.2 6.0 V Input mid-level voltage V INM 23 V Input impedance Z IN 75 k Ω Current drain I CC 5.5 10.0 mA Electrical Characteristics at Ta = 25°C, VCC = 12 V Continued on next page.

No. 58062/5 LB1943 Continued from preceding page. Note: Items marked with an asterisk (*) are design target values, and are not tested. Input levels:VH : Over 4.2 V VM : 2.0 to 3.0 V VL: Under 1.0 V IN1 and IN2 go to 2.5 V when left open. LB1943 operation is equivalent to that of the LB1641. Pin Assignment Parameter Symbol Conditions Ratings Unit min typ max VOUT 1 R L = 60 Ω , VC = 2.5 V 4.4 4.95 5.4 V Output voltage VIN1 = 2.5 V, VIN2 = 0 V Output leakage current IOL R L = ∞ 0.01 1.0 mA Saturation voltage (upper) V (sat)11 VCC = 12V, IOUT = 300 mA 1.9 2.2 V V (sat)12 VCC = 12V, IOUT = 500 mA 1.9 2.3 V Saturation voltage (lower) V (sat)21 VCC = 12V, IOUT = 300 mA 0.25 0.5 V V (sat)22 VCC = 12V, IOUT = 500 mA 0.4 0.65 V Reference power supply VREF 6.0 6.35 6.8 V Reference voltage load characteristics∆VREF /∆IREF IREF = 0 to –2.0 mA 0.05 0.1 V/mA Control-to-output gain VOUT /VC , VC = 2.5 V, RL = 60 Ω 1.5 1.9 2.4 · TSD operating temperature TSTD * 150 180 °C -25 0.4 0.6 0.8 1.0 1.2 1.4 0 25 50 75 100 Pd max – Ta Allowable power dissipation, Pd max – W Ambient temperature, Ta – °C 0.6 Tj = 125 °C Truth Table Input Output voltage Operation IN1 IN2 OUT1 OUT2 H H L FULL Forward (reverse) operation M H L VC · 2 Forward (reverse) operation L H L VC · 2 Forward (reverse) operation H M OFF OFF Braking M M OFF OFF Braking L M OFF OFF Braking H L FULL L Reverse (forward) operation M L VC · 2 L Reverse (forward) operation L L VC · 2 L Reverse (forward) operation

No. 58063/5 LB1943 Pin No. Symbol Pin function Equivalent circuit Pin Functions 1 GND • Power system ground. This line is shared with the signal system ground.

3 IN1

  • Output voltage switching input
  • Goes to VM (about 2.5 V) when left open.

4 IN2

  • Forward, reverse, or braking control input
  • Goes to VM (about 2.5 V) when left open.

6 VC • Output voltage setting

7 VREF • Reference voltage output. VREF = 6.35 V

8 VCC 1 • Signal system power supply

9 VCC 2 • Power system power supply

  • Outputs that are connected to the motor coils

Internal Equivalent Circuit No. 58064/5 LB1943 Peripheral Circuit Example Usage Notes 1. The microprocessor output ports are CMOS outputs, and must be used in the high, low, or open states. 2. We recommend using a value of about 60 kΩ for R1 and R2. 3. Voltages applied to the IN1 and IN2 pins must not exceed the range 0 to 6 V. Note that negative voltages can cause the IC to operate incorrectly. Also, do not apply voltages to IN1 or IN2 when the VCC voltage is not applied. 4. To prevent the upper and lower output transistors from both being in the on state at the same time, when switching the IN1 and IN2 values, always hold the input open for a brief period during the transition. We recommend holding the open state for a few tens of microseconds. 5. A capacitor must be inserted between V CC and ground. We recommend that this capacitor have a value of at least 20 µF. Microcontroller control port Motor Logic circuit Pre-driver Thermal protection circuit Reference voltage circuit

PS No. 5806-5/5 LB1943 6. During motor drive, large currents (on the order of several hundred mA) flow in the motor power supply block. Therefore, the printed circuit board layout and interconnections must be designed so that there are no shared devices. 7. If negative voltages are applied to OUT1 and OUT2 and the IC operates incorrectly, insert Schottky diodes between OUT1 and ground and between OUT2 and ground. This catalog provides information as of February, 1998. Specifications and information herein are subject to change without notice. n 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. n Anyone purchasing any products described or contained herein for an above-mentioned use shall: À 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: \` 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. n 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.