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NCP1910
PFC_OVP2
CS/FF
+
?
S
Q
Latch
V CS2
Q
”1” to disable LLC and PFC driver,
and pull down PFCok
R
PFC_BO
+
?
”1” to set the SR ? latch to
pull low SS pin
Grand Reset
V CS1
Figure 59. The Fast Fault Input at CS/FF pin
LLC Soft ? Start (SS Pin)
In resonant converter, a soft ? start is needed to avoid
suddenly applying the full current into the resonating circuit.
NCP1910 reserves SS pin to fully discharge soft ? start
capacitor before re ? start and in case of fault conditions:
? LLC brown ? out actives,
? t DEL2 is elapsed, where t DEL2 timer could be activated
by line brown ? out or power good comparator,
? CS/FF pin is above V CS1 , the fast fault input for LLC,
? V CC UVLO,
? PFC UVP,
? Off signal from on/off pin, or
? Thermal Shut ? Down (TSD)
When the switch inside SS pin is activated to discharge the
soft ? start capacitor, it keeps close until V SS is below
V SS_RST (150 mV typically). It ensures the full discharge of
soft ? start capacitor before re ? start, and hence the fresh
soft ? start is confirmed.
R t
Once the LLC part starts operation, the internal switch at
SS pin is released open and the empty soft ? start capacitor
withdraws current from R t pin through soft ? start resistor,
R SS . This current charges up and soft ? start capacitor and
increases the operating frequency of LLC. As the soft ? start
capacitor is charged, the LLC driver output frequency
smoothly decreases down to F min . Of course, practically, the
feedback loop is supposed to take over the CCO lead as soon
as the output voltage has reached the target.
LLC Skip (Skip Pin, B Version Only)
To avoid any frequency runaway in light conditions but
also to improve the standby power consumption, the
NCP1910B welcomes a skip mode operation (Skip pin)
which permanently observes the opto ? coupler collector as
depicted in Figure 60. If skip pin senses a low voltage, it cuts
the LLC output pulses (ML and MU pins) until the collector
goes up again.
Feedback
R max
R SS
C SS
R min
SS
opto ? coupler
Skip
Disable ML and
V Skip
MU
Figure 60. The LLC Skip Mode Configuration
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