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参数资料
| 型号： | BD6637KV-E2 |
| 元件分类： | 运动控制电子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 1 A, PQFP64 |
| 封装： | ROHS COMPLIANT, VQFP-64 |
| 文件页数： | 4/17页 |
| 文件大小： | 763K |
| 代理商： | BD6637KV-E2 |
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Description of operations
Description of capstan operation
1.
Hall input - output
The Hall sensor input signal of the three-phase, is amplified by the Hall amplifier to produce a drive signal
waveform. This drive signal is amplified, once again, by the output amplifier to supply a drive current for the motor
coil. Output current is a trapezoidal waveform. Due to the trapezoidal waveform, gaps are generated in the
magnetic field by the three-phase coil, which causes a slight irregularity of rotation. In operation, the triangle wave
is superimposed upon the trapezoidal output waveform. (Torque ripple cancellation)
2.
Torque control
Output current can be controlled by the voltage applied to C.EC (torque control terminal).
3.
Brake
When the C.FBR terminal is set to M, each output voltage becomes low and the brake is applied.
Brake command voltage: C.FBR 1.3V to 1.7V
4.
Motor power supply control function
In order to use power effectively (as well as to prevent exceeding permissible dissipation of IC), it is required to
change supply voltage according to output current, i.e. to reduce supply voltage when current output is low, and
increase when current output is high, thereby preventing extra voltage from being applied between Drain and
Source of output stage MOS. Power supply control function (VS terminal) is installed for this purpose. In this
function, the voltage between Drain and Source of upper MOS of output stage is detected, and output to VS
terminal as a power supply control signal. This gain signal is multiplied several times by DC/DC, for controlling
motor power supply.
5.
Output TR saturation preventing circuit
This circuit is used to operate output MOS in linear region. It has good dynamic range from a low to high current,
and provides a good rotating performance under overload, etc.
Description of cylinder operation
1.
Back electromotive force detecting comparator (BEMF)
Compares the output voltage of the motor with the midpoint potential BEMF and detects the position of the rotor
and stator (magnet and coil). Further, the BEMF is provided with hysteresis, which can be set by resistor RD.com,
connected to D.COM terminal.
2.
Phase switching logic
Synthesizes the output from three-phase BEMF force detecting comparator. The noise pulse of BEMF by the motor
is eliminated by MASK signal, generated by D.SL terminal 1 and 2 with reference to each position-detected signal.
Only the rising edge of masked synthetic output is used as a signal for the secondary counter. While output from
secondary and drive signal is synthesized, FG signal is generated every 60 degrees (electric angle).
3.
Slope
D.SL terminal 1 and 2 are charged and discharged in synchronization with the timing of the internal FG signal. For
driving soft switching, slope is applied to output current waveform by the slope rate of D.SL terminal 1 and 2.
MASK signal is generated by charging and discharging waveform of D.SL terminal 1 and 2. MASK signal L is
output only when the charging and discharging waveform of D.SL terminal 1 and 2 is clamped at L level, when
MASK is canceled. Otherwise, H is output and MASK is applied, and noise pulse by back electromotive force of
motor is removed.
4.
Detection circuit - start signal synthesizing
When a capacitor is connected to D.DETECT terminal, charging and discharging are performed. When the motor is
stopped, D.DETECT terminal repeats charging and discharging between Low-level and High-level. Only the rising
edge of square wave (SEL) that is synchronized with D.DETECT terminal, is compared with rising edge of
synthesized output of BEMF detecting comparator. When the motor is stopped, BEMF detecting comparator is not
output. Therefore, the edge of SEL signal is input to secondary counter and attempts to force the motor to rotate
(synchronized mode). Before the motor rotates and D.DETECT terminal reaches High-level, BEMF detecting
comparator detects BEMF motor. When synthetic output of BEMF detection comparator is output, D.DETECT
terminal starts discharging on the corresponding edge. When Low-level is reached, charging is started again, and
discharging is started on the edge of BEMF detecting comparator output. Here the edge of synthetic output of
BEMF comparator is input to secondary counter, and the motor rotates. (BEMF mode)
Internal reference voltage
Torque command
start voltage
C. EC voltage
C. RNF voltage
1.2V
1.05
1.35
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