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BA6239A Scheda tecnica(PDF) 5 Page - Rohm |
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BA6239A Scheda tecnica(HTML) 5 Page - Rohm |
5 / 8 page 494 Motor driver ICs BA6238A / BA6238AN / BA6239A / BA6239AN FCircuit operation (1) Input (pins 4, 5, and 6) These pins receive control logic signals. The relevant cir- cuits are designed to have hysteresis and antinoise char- acteristics. The input circuit can control the logic by input currents of a few microamperes or more. The motor con- nected between pins 10 and 2 is selected when pin 4 is HIGH and pin 5 is LOW, while the motor connected be- tween pins 10 and 3 is selected when pin 5 is HIGH and pin 4 is LOW. Pin 6 is the forward / reverse control input pin. (2) Output (pins 2, 3, and 10) Pin 10 is the common pin. Either pin 2 or 3 is left OPEN during motor driving. The waveform monitored on the OPEN pin will be the same as that on pin 10. (1) BA6238A / BA6238AN The output stage configuration of the BA6238A / BA6238AN is shown in Fig. 5. The output stage contains NPN transistors in a Darlington configuration, which means the saturation voltage between VCC1 and the out- put pin is rather high but the output voltage can be easily set by using a zener diode or a resistor voltage divider. The voltage on the VR pin can be varied from 0V to VCC1. The output voltage is at the maximum when pin 8 is OPEN. VOH=VCC1–Vsat (PNP)–2 VBE (NPN Darlington) VOL=Vsat (NPN Darlington) Vsat and VBE are functions of the output current (see Fig. 17). (2) BA6239A / BA6239AN The output configuration of the BA6239A / BA6239AN is shown in Fig. 6. Because the output stage contains only one NPN transistor, the saturation voltage between pin 8 and the output pin is about 0.7V less than that in the BA6238A. The output voltage is controlled by the pin-8 voltage. The voltage on the VR pin can be varied from 8V to VCC1. The output voltage is at the maximum when pin 8 is VCC1. VOH=VR–Vsat (PNP)–VBE (NPN) VOL=Vsat (NPN Darlington) Vsat and VBE are functions of the output current (see Fig. 18). (3) Output control (pin 8) Output voltage can be varied by controlling the pin-8 volt- age. (1) BA6238A / BA6238AN The pin-8 voltage can vary from 0V to VCC. Because a constant current (0.6mA typically) flows out from pin 8, the output voltage can be controlled by using a zener diode or a resistor voltage divider. (2) BA6239A / BA6239AN In addition to controlling the output voltage, pin 8 supplies base current to the high-side output transistor (NPN). (4) Power supply (pins 7 and 9) Pin 7 supplies power to the input, logic, and thermal shut- down circuits. Pin 9 supplies power to the output transis- tors. (5) Thermal shutdown circuit Regardless of the input mode, the thermal shutdown cir- cuit puts the outputs to LOW level when the chip temper- ature rises due to such an event as motor locking. When the thermal shutdown circuit is deactivated, the outputs revert to the status determined by input mode. The thermal shutdown circuit is activated when the chip temperature exceeds 150 _C (125_C minimally), and deactivated when the chip temperature drops to 100 _C (125 _C maximally). The minimum temperature differ- ence between the activation and deactivation settings is 10 _C. (6) Ground pin and fins Pin 1 and the fins have the minimum potential within the IC. The PCB design should ensure that the common im- pedance is kept as low as possible when a large current flows. |
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