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Motor driver ICs
2-channel reversible motor driver
BA6259N
The BA6259N incorporates two reversible-motor drivers. FFeatures 1) Two reversible-motor driver circuits are built in. 2) Built-in thermal shutdown circuit. FBlock diagram
3) SIP10pin package.
FAbsolute maximum ratings (Ta = 25_C)
504
Motor driver ICs
FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 12V)
BA6259N
FInput / output truth table
FApplication example C2, C3 : Capacitors for preventing parasitic oscillation. Though the optimum capacitance depends on such PCB arrangement factors as the power supply circuit, motor characteristics, and conductor foil patterns, a range of 0.01X1F is recommended. C4, C5 : Capacitors for preventing parasitic oscillation. They may or may not be required, depending on the PCB arrangement. A capacitance range of 0.01X10F is recommended.
505
Motor driver ICs
FControl pin equivalent circuit
BA6259N
FOparation notes (1) Use the BA6259N with VR (pin 8) short-circuited to VCC2 (pin 9). The VCC2 potential should be lower than the VCC1 potential. Under these conditions, the IC provides a HIGH level output voltage of 11.3V (typical, VCC2=12V). Because a single transistor is used for the low-side output stage, the LOW level output voltage is further lowered. This results in a wide range of motor drive voltage. (2) Though the IC input pins can be directly connected with MOS output pins, it is recommendable to connect resistors of a few kiloohms to do3en of kiloohms between the pins for the sake of pin protection.
(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 output is 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 ratings, then be sure to incorporate fuses, or other physical safety measures. (7) Input pins Voltage should never be applied to the input pins when the VCC voltage is not applied to the IC. Similarly, when VCC is applied, the voltage on each input pin should be less than VCC and within the guaranteed range for the electrical characteristics. (8) 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.
506
Motor driver ICs
(9) 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. (10) 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. (11) Power consumption The power consumption by the IC varies widely with the power supply voltage and the output 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. (12) ASO Make sure that the output current and supply voltage do not exceed the ASO values. (13) Precautions for input mode switching To ensure reliability, it is recommended that the mode switching for the motor pass once through the open mode. (14) 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. (15) 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.
BA6259N
507
Motor driver ICs
FElectrical characteristic curves
BA6259N
FExternal dimensions (Units: mm)
508

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