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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： | 5/17页 |
| 文件大小： | 763K |
| 代理商： | BD6637KV-E2 |
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5.
Torque control
Output current can be controlled by the voltage applied to D.EC (torque control terminal), as with capstan
assembly.
6.
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
control supply voltage according to output current.
For example, 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 used for this purpose. In this function,
the voltage between Drain and Source of upper MOS of output stage is detected, and sent to VS terminal as a
power supply control signal. This gain signal is multiplied several times by DC/DC, for controlling motor power
supply.
7.
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 loading assembly operation
1.
L.FBR input - output
Output (L.REV and L.FWD) is three-mode output for forward/reverse rotation and braking, depending on the
voltage input to L.FBR.
2.
Loading assembly output H voltage control
Output High-voltage of loading assembly can be set by the voltage input to L.RFF terminal.
Output High-voltage VOH can be represented by the formula below:
L.REF voltage where the formula above holds true is 1.7 V - L. VM voltage.
Application part selecting procedure
Selection of constant in the example of recommended circuit is shown below:
1) Capstan hall bias resistor (RH1 and RH2)
The amplitude and bias point of hall element can be set by hall bias resistor. Hall amplitude varies with hall element
in use even when the same bias resistor is used, therefore adjust the bias resistor so that the amplitude of hall
element is 50 - 100mvp-p as well as within the range of hall amplifier in-phase input voltage range of capstan
assembly (1.2 - VCC-1.1V).
2) Capstan C.RCC resistor
Canceling rate of torque ripple canceling circuit of capstan assembly can be adjusted by the resistor equipped
externally on C.RCC terminal. Select the optimum value, considering the vibrations, when the IC is mounted to the
motor. The optimum value depends on the motor, while 2k to 4k is recommended.
3) Cylinder D.COM terminal connection terminal
By inserting a resistor in the middle point of D.COM terminal and motor, the BEMF detecting comparator can also
generate hysteresis, thereby preventing any noise from causing malfunction. Hysteresis width can be calculated as
follows:
Hysteresis width = ± R.D.COM x 20
A (Typ. value)
The optimum value depends on the motor, while 200 to 300 is recommended.
Output H voltage
L L. REF voltage
Output H voltage setting range
L.VM
Upper limit of hall input voltage range (VCC-1.1V)
Vcc
GND
Hall
amplifier
i
n
-ph
ase
inpu
t
volt
ag
e
ra
nge
Lower limit of hall input voltage range (1.2V)
Amplitude of hall element
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