bd6709fs ROHM Co. Ltd., bd6709fs Datasheet - Page 25

• Manufacturer Part Number: bd6709fs
• Description: Dc Brushless Motor Drivers For Cooling Fans Speed Controllable Single-phase Full-wave Dc Brushless Fan Motor Drivers
• Manufacturer: ROHM Co. Ltd.

B D 6721F S
B D 6709F S
B D 6718F V
B D 6722F S
3) Lock protection and automatic restart
Motor rotation is detected by hall signal, and lock detection ON time (TON) and lock detection OFF time (TOFF) are
set by the IC internal counter. Timing chart is shown in Fig.84.
O U T1
O U T2
A 1H
A 2H
A 1H
A 2H
A 1L
A 2L
A 1L
A 2L
FG
FG
FG
H +
A L
A L
＊ For BD6718FV, lock detection time (TOFF) setting can be changed by SEL terminal.
(See the electric characteristics item)
Fig.84 Lock protection (incorporated counter system) timing chart
locking
M otor
Lock
detection
O utput Tr
O F F
H IG H (open collecter)
H IG H (open collector)
TO FF
25/40
O utput Tr O N
TO N
TO FF
Lock release
Recovers norm al operation
TO FF :
TO N :
: H igh-im pedance
Lock detection O N tim e
Lock detection O F F tim e