TA7259 데이터 시트보기 (PDF) - Toshiba

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TA7259

3-PHASE BRUSHLESS DC MOTOR DRIVER IC

Toshiba 

TA7259P/F/FG

(3) Connecting condenser for output ringing absorption

We recommend connecting a condenser between each coil and the GND for output ringing absorption .

However, other methods below can be also applied to prevent oscillation and destruction.

ⅰ) Changing capacity.

ⅱ) Delta connection (Fig.6−a)

ⅲ) Connect to VCC, not to the GND. (Fig. 6−b) In this case; take care not to let the IC be destroyed.

If voltage-current locus is beyond the ASO, series resistance or equivalent must be inserted.

ⅳ) Connect to RF pin.

ⅴ) Insert a resistance between condenser and series. (Fig. 6−c)

ⅵ) Combination of ⅰ), ⅱ), ⅲ), and ⅳ).

TA7259

P/F/FG

Use bipolar condenser.

Fig. 6-a

TA7259

P/F/FG

Fig. 6-b

TA7259

P/F/FG

Fig. 6-c

Others

The output transistor of the IC can be destroyed when the capacity of the output condenser or its connection is

not appropriate. To prevent destruction, confirm the voltage-current locus of the output transistor gained from

the test (see the figure below) is within the ASO. It is especially important to measure the output transistor in

SW’s ON/OFF timing and the sequence of normal rotation, reverse rotation, and normal rotation.

Current probe

To Y-axis of oscilloscope

Applying not only La but Lb

and Lc is recommended.

Current- voltage locus

To X-axis of oscilloscope

Fig. 7

11

2006-4-14

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