BD6369GUL Ver la hoja de datos (PDF) - ROHM Semiconductor

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Fabricante

BD6369GUL

Parallel Interface Type Lens Drivers for Voice Coil Motor

ROHM Semiconductor 

BD6883GUL,BH6453GUL,BD6886GUL,BD6369GUL

Technical Note

●Operation Notes

1)

Absolute maximum ratings

Use of the IC in excess of absolute maximum ratings, such as the applied voltage (VCC, VM) or operating temperature

range (Topr), may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or

open mode) when such damage is suffered. A physical safety measure, such as a fuse, should be implemented when

using the IC at times where the absolute maximum ratings may be exceeded.

2)

Storage temperature range (Tstg)

As long as the IC is kept within this range, there should be no problems in the IC’s performance. Conversely, extreme

temperature changes may result in poor IC performance, even if the changes are within the above range.

3)

Power supply and wiring

Be sure to connect the power terminals outside the IC. Do not leave them open. Because a return current is

generated by a counter electromotive force of the motor, take necessary measures such as putting a Capacitor

between the power source and the ground as a passageway for the regenerative current. Be sure to connect a

Capacitor of proper capacitance (0.1μF to 10μF) between the power source and the ground at the foot of the IC, and

ensure that there is no problem in properties of electrolytic Capacitors such as decrease in capacitance at low

temperatures. When the connected power source does not have enough current absorbing capability, there is a

possibility that the voltage of the power source line increases by the regenerative current an exceeds the absolute

maximum rating of this product and the peripheral circuits.

Therefore, be sure to take physical safety measures such as putting a zener diode for a voltage clamp between the

power source an the ground.

4)

Ground terminal and wiring

The potential at GND terminals should be made the lowest under any operating conditions. Ensure that there are no

terminals where the potentials are below the potential at GND terminals, including the transient phenomena. The

motor ground terminals PGND, and the small signal ground terminal GND are not interconnected with one another

inside the IC. It is recommended that you should isolate the large-current RNF pattern and PGND pattern from the

small-signal GND pattern, and should establish a one-point grounding at a reference point of the set, to avoid

fluctuation of small-signal GND voltages caused by voltage changes due to pattern wire resistances and large

currents. Also prevent the voltage variation of the ground wiring patterns of external components. Use short and thick

power source and ground wirings to ensure low impedance.

5)

Thermal design

Use a proper thermal design that allows for a sufficient margin of the power dissipation (Pd) at actual operating

conditions.

6)

Pin short and wrong direction assembly of the device.

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.

7)

Avoiding strong magnetic field

Malfunction may occur if the IC is used around a strong magnetic field.

8)

ASO

Ensure that the output transistors of the motor driver are not driven under excess conditions of the absolute maximum

ratings and ASO.

9)

TSD (Thermal Shut Down) circuit

If the junction temperature (Tjmax) reaches 175°C (but the BH6453GUL is 150°C), the TSD circuit will operate, and

the coil output circuit of the motor will open. There is a temperature hysterics of approximately 25°C (but the

BH6453GUL is 20°C). 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.

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© 2012 ROHM Co., Ltd. All rights reserved.

14/16

2012.03 - Rev.A

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