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BA6239AN

2-channel reversible motor driver

ROHM Semiconductor 

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.

494

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