Datasheet

21/36

TSZ02201-0F1F0C100040-1-2

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

11.Jul.2012 Rev.001

www.rohm.com

TSZ22111

・

15

・

001

BD9488F

●

3.4.7. how to set the interval until latch off

BD9488 built in the counter by latch off time, that is performed by counting the oscillation clock which is set by the RT pin.

Since the common oscillation circuit is used for counting, the interval until latch off is corresponding to the 130k clock,

which the GATE pulse output continuously. Please refer the time chart of the operation from the detect abnormality to the

latch off in the section 3.7.

○

○

○

○

latch off time

BD9488 starts the counting up from the detection of each abnormal state, falls to the latch off state when the following

interval has passed.

Only PWM=L input does not reset the timer counter, if the abnormal state continues.

[setting example]

If the resistor of RT pin is 100k ohm, the timer latch interval is as following.

　

[sec]

10

5

.

1

]

[

130

10

5

.

1

]

[

2

7

10

17

×

Ω

×

=

×

Ω

×

=

k

R

k

R

LATCH

RT

RT

TIME

　

sec]

[

866

10

5

.

1

]

[

100

130

10

5

.

1

]

[

130

7

7

m

k

k

k

R

k

LATCH

RT

TIME

=

×

Ω

×

=

×

Ω

×

=