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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： | 7/17页 |
| 文件大小： | 763K |
| 代理商： | BD6637KV-E2 |
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Operation Notes
1) Absolute maximum ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break
down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated
values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses.
2) Power supply lines
Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and
supply line, separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power
supply terminals to ICs, connect a capacitor between the power supply and the GND terminal. When applying
electrolytic capacitors in the circuit, note that capacitance characteristic values are reduced at low temperatures.
3) GND potential
Ensure a minimum GND pin potential in all operating conditions. In addition, ensure that no pins other than the GND pin
carry a voltage less than or equal to the GND pin, including during actual transient phenomena. The voltage of the motor
output pin may, however, drop below the GND potential due to the BEMF voltage of the motor. Malfunctions or other
failures may result, depending on the operating conditions, environment, and individual characteristics of the motor.
Check that the IC has no operational problems.
4) Thermal Design
Use a proper thermal design that allows for a sufficient margin of the power dissipation (Pd) at actual operating conditions.
5) Pin short and mistake fitting
Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any
connection error or if positive and ground power supply terminals are reversed. The IC may also be damaged if pins are
shorted together or are shorted to other circuit’s power lines.
6) Operation in a strong electromagnetic field
Use caution when using the IC in the presence of a strong magnetic field, as doing so may cause the IC to malfunction.
7) ASO
When using the IC, set the output transistor so that it does not exceed absolute maximum ratings or ASO.
8) Thermal shutdown circuit
If the junction temperature (Tj) reaches 175°C (Typ.), the TSD circuit will operate, and the coil output circuit of the motor
will open. There is a temperature hysteresis of approximately 25°C (Typ.). The TSD circuit is designed only to shut off the
IC in order to prevent runaway thermal operation. It is not designed to protect the IC or guarantee its operation. The
performance of the IC’s characteristics is not guaranteed and it is recommended that the device is replaced after the TSD
is activated.
9) Testing on application boards
When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress.
Always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to, or
removing it from a jig or fixture, during the inspection process. Ground the IC during assembly steps as an antistatic
measure.
Use similar precaution when transporting and storing the IC.
10) Ground wiring patterns
If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern
from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the
wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay
attention not to cause fluctuations in the GND wiring pattern of external parts as well.
11) Capacitors connected between output and ground pins
If a large capacitance value is connected between the output and ground pins, and if the VCC falls to 0 V or becomes
shorted with the ground pin, the current stored in the capacitor may flow to the output pin. This can cause damage to the
IC. The capacitance value between the output and GND must be 100F or lower.
12) Regarding input pin of the IC
If no Vcc voltage is applied to the IC do not apply any voltage to the input pins. If a voltage higher, or as high as the Vcc, or
a voltage lower than, or as low as, the GND is applied, parasitic elements may result due to the structure of the IC. The
operation of parasitic elements can cause interference with circuit operation as well as IC malfunction and damage. Use
caution so that the IC is not used in a manner that will trigger the operation of parasitic elements.
13) Operating Precautions
Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to
verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits
may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow
for sufficient margins when determining circuit constants.
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