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IR2277S/IR2177S (PbF)
Cycle 1
Cycle 2
Cycle 3
Cycle 4
Triangular
SYNC (0)
PO
T off_cycle1
T cycle1
T off_cycle2
Dn 1 =
T off _ cycle 2
T cycle 1
T cycle2
T off_cycle3
Dn 3 =
Dn 2 =
T off _ cycle 3
T cycle 2
T cycle3
T off _ cycle 4
T cycle 3
T off_cycle4
Figure 8: PO Duty Cycle
E xt
supply
H igh voltage
Low voltage
OC
V IN +
V IN -
O ver current
detection
S
D
V SS
R
PO
Figure 9: Over current block diagram
12
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