LB1694 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1694

3-phase Brushless Motor Driver

SANYO -> Panasonic 

LB1694N

(2) When the output off time is set long

If the output off time is set to a very long length of time, the average current decreases, with the result that the torque at

motor start-up drops. Depending on the type of motor, it may be impossible to shift from the current limiter operation

state to the normal rotation state.

C pin voltage

RF pin voltage

Fig. 1 Current Limiter Operation Waveform

8. Calculation of the IC’s internal power dissipation

Pd = (VCC × ICC) + (VM × IM) – (power dissipated by the motor coil)

9. Measuring the increase in the IC’s temperature

Because the temperature of the IC chip cannot be measured directly, the temperature is normally measured using one of the

following methods.

9-1. Measurement using a thermocouple

In order to measure the temperature by using a thermocouple, mount the thermocouple on the fin. Although this method of

measurement is simple, if the rate of heat generation has not stabilized, the measurement error is great.

9-2. Measurement using the characteristics of a diode within the IC

It is recommended that the parasitic diode between FG1 and GND be used to measure the temperature of the IC.

Set FG1 high (the ‘‘off’’ state), measure the parasitic diode voltage VF, and calculate the temperature based on the

temperature characteristics of the voltage VF.

(Sanyo’s data: IF = –1 mA, VF temperature characteristics: approximately –2 mV/ °C)

No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,

nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or

indirectly cause injury, death or property loss.

Anyone purchasing any products described or contained herein for an above-mentioned use shall:

1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors

and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and

expenses associated with such use:

2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO

ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume

production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use

or any infringements of intellectual property rights or other rights of third parties.

This catalog provides information as of December, 1995. Specifications and information herein are subject to change without notice.

No.5243-8/8

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