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| Motor driver ICs Reversible motor driver BA6246N / BA6247 / BA6247N / BA6247FP-Y The BA6246N, BA6247, BA6247N and BA6247FP-Y are monolithic ICs incorporating two reversible-motor drivers. The ICs differ in the control logic and output mode. FFeatures 1) Two reversible-motor drivers in each unit. 2) Built-in thermal shutdown circuit. 3) Output voltage can be set arbitrarily. 4) Available in a compact SIP10pin package (BA6246N, BA6247N) or a HSIP10pin package with radiation fins (BA6247). 5) Available in a HSOP25pin surface-mount package (BA6247FP-Y). FBlock diagram 498 Motor driver ICs FControl pin equivalent circuits BA6246N / BA6247 / BA6247N / BA6247FP-Y FInput / output truth table FAbsolute maximum ratings (Ta = 25_C) 499 Motor driver ICs BA6246N / BA6247 / BA6247N / BA6247FP-Y FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 12V) FApplication examples 500 Motor driver ICs BA6246N / BA6247 / BA6247N / BA6247FP-Y FOperation notes (1) Input conditions (1) The input threshold voltage is positively correlated with temperature as expressed by : VIH T )2.8mV / _C VIL )1.6mV / _C (Typ.) T (2) The input pins of the BA6246N are pulled up through a resistance of about 15k (see Fig. 1). To secure the LOW level input, the interface to these pins should have a current-sink capability of at least 700A (5V / 15k 2). (3) The maximum input voltage is 6V. Make sure that the input will not exceed this value. Also when the voltage VCC is not applied to the IC, do not apply voltages to the input pins. (2) Changes in motor direction When reversing the rotational direction of a motor, make sure to go through the brake or open mode in-between the opposite directions. The duration of brake mode should be more than the braking time, which is defined by the time required for the potential of the LOW level output pin to become less than the ground potential by the electromotive force generated when the mode is switched from rotation to brake. The duration of open mode should be 1 ms or more. (3) Due to the effects of capacitors C2XC5, the motor that is not being driven could be momentarily driven during mode switching. Check for this problem when designing your application. (4) It is recommendable to arrange your design so that voltage rises at VCC1 prior to VCC2 when turning on the power, and voltage falls at VCC1 after VCC2 when turning off the power. (5) Thermal shutdown circuit When the thermal shutdown circuit is activated, the outputs are left OPEN. The circuit is activated when the IC junction temperature rises above 170_C. The temperature difference between the activation and deactivation settings is about 30_C. (6) The quality of these products have been carefully checked; however, use of the products with applied voltages, operating temperatures, or other parameters that exceed the absolute maximum rating given may result in the damage of the IC and the product it is used in. If the IC is damaged, the short mode and open modes cannot be specified, so if the IC is to be used in applications where parameters may exceed the absolute maximum retings, then be sure to incorporate fuses, or other physical safety measures. (7) Back-rush voltage Depending on the ambient conditions, environment, or motor characteristics, the back-rush voltage may fluctuate. Be sure to confirm that the back-rush voltage will not adversely affect the operation of the IC. (8) Large current line Large currents are carried by the motor power supply and motor ground for these ICs. Therefore, the layout of the pattern of the PC board and the constants of certain parameters for external components, such as the capacitor between the power supply and ground, may cause this large output current to flow back to the input pins, resulting in output oscillation or other malfunctions. To prevent this, make sure that the PC board layout and external circuit constants cause no problems with the characteristics of these ICs. (9) Power dissipation The power dissipation will fluctuate depending on the mounting conditions of the IC and the ambient environment. Make sure to carefully check the thermal design of the application where these ICs will be used. (10) Power consumption The power consumption by the IC varies widely with the power supply voltage and the putput current. Give full consideration to the power dissipation rating and the thermal resistance data and transient thermal resistance data, to provide a thermal design so that none of the ratings for the IC are exceeded. (11) ASO Make sure that the output current and supply voltage do not exceed the ASO values. (12) In-rush current There are no circuits built into these ICs that prevent inrush currents. Therefore, it is recommended to place a current limiting resistor or other physical countermeasure. (13) Factors regarding the thermal, power supply, and motor conditions If the potential of the output pin sways greatly and goes below the potential of ground, the operation of the IC may malfunction or be adversely affected. In such a case, place a diode between the output and ground, or other measure, to prevent this. 501 Motor driver ICs FPower dissipation curves BA6246N / BA6247 / BA6247N / BA6247FP-Y FElectrical characteristic curves 502 Motor driver ICs BA6246N / BA6247 / BA6247N / BA6247FP-Y FExternal dimensions (Units: mm) 503 |
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