BA6832FS datasheet(5/8 Pages) ROHM

5 / 8 page

513

Motor driver ICs

BA6832FS

FCircuit operation

(1)

Output current control

The method of output current control depends on wheth-

er the RTL pin is HIGH or LOW.

(1) When the RTL pin is LOW

The voltage VRS that develops across the resistor RS be-

tween pins 10 and 11 (with reference to pin 10) is con-

trolled by the voltage between Vctl (pin 18) and Vref (pin

19) :

VRS=(Vctl

*Vref) 1 (Typ.)

The output current IO is given by :

IO=(Vctl

*Vref) / Rs (Typ.)

where the positive direction is from pin 13 to pin 10.

Therefore, the voltage-current conversion gain for the

control input is determined by the RS value. The gain

band width in this case is 80kHz (typical).

(2) When the RTL pin is HIGH

The VRS voltage (with reference to pin 10) is controlled by

the Vrtr (pin 17) voltage (with reference to the ground) :

VRS=

*0.1 Vrtr / Rs

(3) RTR threshold

The RTR pin threshold voltage is 1.2

X1.3V. The pin has

a hysteresis width of about 40mV.

(2)

Standby mode

The standby mode is activated when the CE pin is LOW;

the circuit current is reduced to 0.15mA (typical), and the

output pins are put to the high impedance state. The op-

eration mode is activated when the CE pin is HIGH, and

the output current becomes controllable. The pin’s

threshold voltage is 1.2

X1.3V.

(3)

Internal reference voltage

The internal reference voltage Vreg is given by :

Vreg=(VCC

*VF)/2

where Vreg=5.65 when VCC=12V. The output pins (pins 10

and 13) operate with reference to Vreg.

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