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PDF TA7259FG Data sheet ( Hoja de datos )
| Número de pieza | TA7259FG | |
| Descripción | 3-PHASE BRUSHLESS DC MOTOR DRIVER IC | |
| Fabricantes | Toshiba | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TA7259FG (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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TA7259P/F/FG
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA7259P, TA7259F/FG
3-PHASE BRUSHLESS DC MOTOR DRIVER IC
The TA7259P/F/FG is a 3−phase Bi-directional motor driver IC.
It designed as an output driver for motors in VTR (capstan,
cylinder, and reel), tape deck, floppy disk, and record player
applications.
To detect position, use of a position sensing device is
recommended.
FEATURES
z Wide operating supply voltage range: VCC (opr.) MIN. = 7 V
z Forward and reverse rotation is controlled simply by means of a
CW / CCW control signal fed into FRS.
z High sensitivity of position sensing amplifier.
(VH = 10 mV (Typ.), TOSHIBA Ga−As Hall sensor “THS” series
is recommended.
z 3−phase Bi-directional driver and output current up to ±1.2 A.
z Few external parts required.
z Surge-protect diode connected for all input terminals (position
sensing, control, CW / CCW control inputs).
The TA7259FG is a Pb free product.
The TA7259P is an Sn-plated product including Pb.
The following conditions apply to solderability:
*Solderability
1. Use of Sn-37Pb solder bath
*solder bath temperature = 230°C
*dipping time = 5 seconds
*number of times = once
*use of R-type flux
2. Use of Sn-3.0Ag-0.5Cu solder bath
*solder bath temperature = 245°C
*dipping time = 5 seconds
*the number of times = once
*use of R-type flux
Weight
HDIP14−P−500−2.54A : 3.00 g (Typ.)
HSOP20−P−450−1.00 : 0.79 g (Typ.)
1 2006-4-14
1 page  
TA7259P/F/FG
Control signal input
In the initial state of the TA7259P/F/FG, the control voltage is usually input either by an F/V inverter or
such like, where the voltage is in proportion or inverse proportion to the number of rotations, or independently.
Though output (RF pin) gain from the TA7259 control is specified in the table as 15 times, it can be reduced
to improve the characteristics of W/F etc. by applying NF.
An example of the application is shown below.
Whether NF is applied or not, the DC voltage (VIN+ and VIN−) of the control input (VIN+ pin and VIN− pin)
must be within the specified range (2.0 to VCC−2.5V). When the input DC level and F/V conversion output
(control output) cannot interface with the IC input, input DC level shift and attenuator before IC input.
One example is shown in Figure 1−c.
a) Positive input
TA7259P/F/FG
b) Negative input
VZ(5V is recommended)
Figure 1-a
TA7259P/F/FG
Control input
Figure 1-b
Input pin
Figure 1-c
Control output is level shifted with DC content by zenner diode and attenuator, with control signal content by R1
and R2.
5 2006-4-14
5 Page 
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.
) Changing capacity.
) Delta connection (Fig.6−a)
) 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.
) Connect to RF pin.
) Insert a resistance between condenser and series. (Fig. 6−c)
) Combination of ), ), ), and ).
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
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet TA7259FG.PDF ] | |
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