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等级:  维修工 |
| 发贴: 143 |
| 积分: 10 |
| 经验: 251 |
| 体力: 1157 |
| 货币: 1 币 |
| 注册: 2005-06-23 |
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 超声波传感器资料 |
848
Motor driver ICs
Three-phase motor driver for
CD-ROMs
BA6858AFP / BA6858AFM / BA6859AFP /
BA6859AFP-Y / BA6859AFM / BA6859AFS
The BA6858A and BA6859A series are ICs developed for CD-ROM spindle motor drives. In addition to the functions
of the BA6849 series, (short brake, reverse-rotation prevention circuit, rotation direction dector, and FG output), the
BA6858A and BA6859A series have a built-in brake mode switching pin. With torque command input, these series are
compatible with the DSP3.3V. In addition, the BA6858A series has an FG composite output.
Applications
CD-ROM, CD-R, CD-RW, DVD-ROM, and DVD-RAM
Features
1) Three-phase, pseudo-linear drive system.
2) Built-in power save and thermal shutdown functions.
3) Built-in current limiter and Hall bias circuits.
4) Built-in FG output.
5) Built-in rotation direction detector.
6) Built-in reverse rotation prevention circuit.
7) Built-in short brake pin.
8) Built-in brake mode switching pin.
9) DSP3.3V compatible.
Absolute maximum ratings (Ta = 25C)
849
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
Recommended operating conditions (Ta = 25C)
Block diagram
BA6858AFP / BA6858AFM
850
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
Pin descriptions
BA6858AFP/BA6858AFM
851
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
BA6859AFP/BA6859AFM BA6859AFP-Y
852
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
BA6859AFS
853
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
Input / output circuits
(1) Power save (2) Torque command input
(3) Torque output (A1, A2, and A3)
(4) Hall input (H1
, H1
, H2
, H2
, H3
, H3
)
854
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
(5) Hall bias
(6) FG output
(7) FG2 Output
(8) FR output
(9) Short brake
855
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
(10) Brake mode
Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, VM = 12V)
856
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
857
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
Circuit operation
(1) Hall input to coil output
The phase relationship between the Hall input signals and the output current and voltage is shown in Fig.11. The motor
position data input via the Hall pins is amplified by the Hall amplifier, and formed into waveforms by the matrix block.
These signals are input to the output driver that supplies the drive current to the motor coils.
858
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
(2) Torque command
The RNF pin voltage with respect to the torque command (EC) is as follows:
The I / O gain (GEC) from the EC pin to the RNF pin (output
current) is determined by the RNF detector resistor.
GEC = 0.35 / RNF (A / V)
The torque limit current ITL is given by:
ITL = 0.35 / RNF (A)
(3) Reverse rotation detection function
The reverse detection circuit construction is shown in
Fig.13.
(1) Forward (EC < ECR)
The phase relationship between the Hall input signals
H2
and H3
becomes as shown in Fig.11, and the reverse
rotation detection circuit does not operate.
(2) Reverse (EC > ECR)
The phase relationship between the signals H2
and
H3
is opposite that for forward operation, and the reverse
rotation detection circuit operates. The output
goes OFF, and becomes open circuit.
859
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
(4) Short brake
When 2.5V or more is applied to the short brake pin, the
top-side output transistors of all phases go off, and the
bottom-side output transistors go on. This applies braking
to the motor. Short braking operates regardless of the
torque command signal.
(5) Brake mode switching
When 2.5V or more is applied to the BR pin, the brake
mode for when EC > ECR can be changed.
(6) Power save
When 2.5V or more is applied to the power save pin, all
circuits are on. When 1.0V or less is applied, the IC enters
power save mode, and functions only for surpressing
power consumption.
Application example
860
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
Operation notes
(1) Torque command
When operating with ECR = 2.5V, the voltage range for the
torque command input is 0.5V to 3.3V, and therefore, the
characteristic will be unbalanced as shown in Fig.15.
Take due care.
(2) Switches
The switches have a temperature characteristic of
approximately –5mV / C. Take care with regard to the
input voltage range.
(3) Hall input
The input circuit shown in Fig.4 is used for the Hall inputs.
The Hall elements can be connected either in series or in parallel.
Set the Hall input voltage in the range 1.0V to 4.0V.
Set the resistance values between VH and VCC pins and the Hall elements after calculating the current to flow in Hall
elements.
If there will not be a resistor connected between the Hall elements and the VH pin, we recommend that IVH = 5mA or more.
(4) Thermal shutdown (TSD)
When the junction temperature reaches 175C (Typ.), the A1, A2, and A3 coil outputs go open circuit.
The thermal shutdown has approximately 15C (Typ.) of hysteresis.
861
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
Electrical characteristics curves
862
M t d i IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs BA6859AFP-Y / BA6859AFM / BA6859AFS
External dimensions (Units: mm) |
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2006-7-2 9:44:37
4202030
