TB6561FG

2007-5-11

8

4.

Current Limiter Detection Circuit (CLD)

The CLD pin outputs the states of the current limiter and thermal shutdown circuits. If the current limiter

for either channel A or B or the thermal shutdown circuit (shared for both channels) operates, the CLD pin

state changes from low (normal state) to high.

The CLD circuit supports automatic recovery; its output returns to low once the current decreases to a

value below the limit or once the thermal shutdown state is released.

Mode

CLD Output

Under TSD operation and

current detection

H

Normal

L

＜

When current limiter operated＞

＜

When TSD circuit operated＞

Current noise and other factors may cause false pulse output. To avoid this, Toshiba recommends a user to

insert a filter or to carry out detection using a sampling monitor. When inserting a filter, please set the

filter time-constant, considering the 50-

μs CLD output.

50

μs

(typ.)

0

10

μs

(typ.)

Not detected

50

μs

(typ.)

10

μs

(typ.)

Output current

CLD output

Ｈ

Ｌ

OFF time

OFF time

160℃(typ.)

Chip temperature

CLD output

Ｈ

Ｌ

120℃(typ.)

TSD

CLD