LB1695 データシートの表示（PDF） - SANYO -> Panasonic

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LB1695

Three-Phase Brushless Motor Driver

SANYO -> Panasonic 

LB1695

(1) If a shorter output off time is used:

Since the output off time and the output current ignored time are set to have a ratio of about 3:1 by IC internal circuits, it

is not possible to set these periods independently. Thus the output current ignored period may become insufficient if the

output off time is set to an excessively short period. If the output current ignored period is too short, the reverse current

in the regenerative current absorption external diode may cause the current limiter circuit to operate. (See Section 7.2.)

Also, if the output off time is decreased, the diode reverse current will increase and ASO may become a problem.

(2) If a longer output off time is used:

If an excessively long output off time is used, the average current will decrease resulting in reduced torque during

motor startup. For some motor types, this may make it impossible to switch from the current limiter operating state

to steady state operation.

C pin voltage

RF pin voltage

Figure 1. Current Limiter Operating Waveforms

8.IC internal power dissipation calculation

Pd = (VCC × ICC) + (VM × IM) – (power dissipated in the motor coils)

9.Techniques for measuring IC internal temperature increases

Since it is not possible to measure the IC internal temperature directly, one of the following techniques is normally

used for temperature measurement.

9.1 Thermocouple measurement

When using a thermocouple for temperature measurement, the thermocouple is attached to a fin on the heat sink.

While this measurement technique is simple, it suffers from large measurement errors when the thermal generation

process is not at steady state.

9.2 Measurement using IC internal diode properties

We recommend using the properties of the parasitic diode that exists between FG1 and ground for measuring the

temperature of this IC. Set FG1 to the high (off) state and measure the VF voltage of the parasitic diode. Then

calculate the temperature from the temperature characteristics of the VF voltage.

s 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.

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

ΠAccept 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:

 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.

s 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 June, 1997. Specifications and information herein are subject to change

without notice.

No. 5678-7/7

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