lb1694n Sanyo Semiconductor Corporation, lb1694n Datasheet - Page 8

• Manufacturer Part Number: lb1694n
• Description: 3-phase Brushless Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

8.
9.
9-1. Measurement using a thermocouple
9-2. Measurement using the characteristics of a diode within the IC
This catalog provides information as of December, 1995. Specifications and information herein are subject to change without notice.
(2) When the output off time is set long
Calculation of the IC’s internal power dissipation
Pd = (V
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.
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.
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 V
temperature characteristics of the voltage V
(Sanyo’s data: I
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
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
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.
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.
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:
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
CC
I
CC
F
) + (V
= –1 mA, V
M
I
M
F
) – (power dissipated by the motor coil)
temperature characteristics: approximately –2 mV/ ° C)
Fig. 1
F
.
Current Limiter Operation Waveform
LB1694N
F
, and calculate the temperature based on the
C pin voltage
RF pin voltage
No.5243-8/8