ASAHI KASEI
[AK2572]
8.2 At Power-On (at TXDIS=”L”)
Start-up sequence at power-on（at TXDIS＝”L”） is shown in Figure 8-2.
Figure 8-2 Start-up Sequence at Power-on (at TXDIS=”L”)
VDD
TXDIS
2ms [Typ.]
TXFAULT with OPTALM enable
(When to set accelerated start-up sequence)
LD Current
APC Feedback
Normal operation
APC FF value or
APC FB initial value
APC FF value
APC FB initial procedure
ALM operation
Power On Reset
Initialization
TXFAULT enable without OPTALM
TXFAULT with
OPTALM enable
(When not to set accelerated start-up sequence)
t_init: 160ms [Typ.]
8.3 At Power-On (at TXDIS＝”H”)
Start-up sequence at power-on (at TXDIS＝“H”) is shown in Figure 8-3.
Figure 8-3 Start-up Sequence at Power-on (at TXDIS＝“H”)
VDD
TXDIS
2ms [Typ.]
TXFAULT with OPTALM enable
(When to set accelerated start-up sequence)
LD Current
APC Feedback
Normal operation
APC FF value or
APC FB initial value
APC FF value
APC FB initial procedure
ALM Operation
Power On Reset
Initialization
TXFAULT enable without OPTALM
TXFAULT with
OPTALM enable
(When not to set accelerated start-up sequence)
t_init: 160ms [typ]
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< MS0290-E-01>
2004/8
AKM [ ASAHI KASEI MICROSYSTEMS ]
