TA7259F TOSHIBA [Toshiba Semiconductor], TA7259F Datasheet - Page 11

• Manufacturer Part Number: TA7259F
• Description: 3-PHASE BRUSHLESS DC MOTOR DRIVER IC
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

Others
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.
The output transistor of the IC can be destroyed when the capacity of the output condenser or its connection is
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 V
ⅳ) Connect to R
ⅴ) Insert a resistance between condenser and series. (Fig. 6−c)
ⅵ) Combination of ⅰ), ⅱ), ⅲ), and ⅳ).
(3) Connecting condenser for output ringing absorption
We recommend connecting a condenser between each coil and the GND for output ringing absorption .
If voltage-current locus is beyond the ASO, series resistance or equivalent must be inserted.
TA7259
P/F/FG
Current probe
TA7259
P/F/FG
CC,
F
Fig. 7
Fig. 6-a
Fig. 6-c
pin.
not to the GND. (Fig. 6−b) In this case; take care not to let the IC be destroyed.
To X-axis of oscilloscope
Applying not only La but Lb
and Lc is recommended.
To Y-axis of oscilloscope
Use bipolar condenser.
11
Current- voltage locus
TA7259
P/F/FG
Fig. 6-b
TA7259P/F/FG
2006-4-14