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| Motor driver ICs Reversible motor driver BA6222 The BA6222 is a reversible-motor driver with a maximum output current of 2.2A. Two logic inputs allow four output modes: forward, reverse, idling, and braking. The motor revolving speed can be set arbitrarily by controlling the voltage applied to the motor. FApplications VCRs FFeatures 1) Large output current. (IOMax. = 2.2A) 2) Built-in thermal shutdown circuit. 3) Output voltage can be adjusted arbitrarily with the output voltage setting pin. Because the pin has a gain of 11.4dB, a high output voltage can be set with a low input voltage. FBlock diagram 4) Small standby circuit current. FEquivalent circuit for pins 5 and 6 405 Motor driver ICs FInput / output truth table BA6222 FAbsolute maximum ratings (Ta = 25_C) FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 12V) 406 Motor driver ICs FApplication example BA6222 FOperation notes (1) Output voltage control pin (pin 4) The voltage at pin 4 is related to the HIGH output voltage (VOH) as follows : V4 ) Vofs VOH = 4 where Vofs is the error voltage, which varies with the output current and the chip temperature. The output voltage is about four times the voltage at pin 4. The V4-value can be classified into three ranges according to the output state : A : VOH is at or near 0V B : VOH is four times the gain C : VOH-value is saturated An oscillation may occur if a circuit having an output impedance of more than a few hundred ohms is connected to pin 4. In this case, connect a capacitor of at least 3300pF between pin 4 and GND. (2) Thermal shutdown circuit The thermal shutdown circuit turns off the driver output if the chip temperature rises to about 150_C. The shutdown signal is not latched. (3) Make sure that pin voltages will not exceed the supply voltage by more than 0.3V or will not become less than the GND pin voltage by more than 0.3V. (4) 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. (5) 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. (6) 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. (7) 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. (8) 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. (9) 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. 407 Motor driver ICs (10) ASO Make sure that the output current and supply voltage do not exceed the ASO values. (11) Precautions for input mode switching To ensure reliability, it is recommended that the mode switching for the motor pass once through the open mode. (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. C1 : Power supply filter capacitor. Place as near as possible to pin 1. C2, C3 : Capacitors to prevent both output transistors being turned on at the same time. C4 : Surge voltage absorbing capacitor C5 : Oscillation preventing capacitor. An oscillation may occur if a circuit having an output impedance of more than a few hundred ohms is connected to pin 4. In this case, connect a capacitor of at least 3300pF. R : Resistor used for reducing collector loss and limiting the short-circuit current. A resistance range of 4.7 X 10 is recommended. BA6222 408 Motor driver ICs FElectrical characteristic curves BA6222 409 Motor driver ICs FExternal dimensions (Units: mm) BA6222 410 |
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