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BA6444FP

3-phase motor driver

ROHM Semiconductor 

Motor driver ICs

BA6444FP

(6) Ripple cancellation circuit

The cancellation ratio of the torque ripple cancellation cir-

cuit (Fig. 10) can be adjusted by an external resistor con-

nected to pin 1. Select a suitable value by taking wow and

flutter into consideration.

The ripple cancellation ratio can be obtained in the fol-

lowing manner. With EC = 2.7V, the RNF value for the Hall

input of (H1), H2), H3)) = (L, L, H) is denoted as V1,

and the RNF value for the Hall input of (H1), H2), H3))

= (L, M, H) is denoted as V2. The ripple cancellation ratio

is then given by:

RCC =

V2*V1

(V1)V2) / 2

100 (%)

(7) Brake pin

The brake pin threshold depends on the chip tempera-

ture as shown in Fig. 16. Make sure that your application

will work properly when using the IC at low or high tem-

peratures.

641

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