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NCP1910
State
ON
OFF
I CC
TBD
< 600 m A
On/off pin
V on
V off
On/off pin
Figure 62. Remote on/off (on/off Pin)
V CC Under ? Voltage LockOut (UVLO)
The device incorporates an Under ? Voltage Lockout block
to prevent the circuit from operating when V CC is too low in
order to ensure a proper operation. An UVLO comparator
monitors V CC pin voltage to allow the NCP1910 to operate
when V CC exceeds V CC(on) . The comparator incorporates
some hysteresis (V CC(Hys) ) to prevent erratic operation as
the V CC crosses the threshold. When V CC goes below the
UVLO comparator lower threshold (V CC(min) ), the circuit
turns off. It is illustrated in Figure 63. After startup, the
operating range is between 9 V and 20 V.
State
ON
OFF
TBD
V CC
I CC
< 100 m A
V CC(min)
V CC(on)
V CC
Figure 63. V CC Under ? Voltage LockOut (UVLO)
Bias the Controller
It is recommended to add a typical 1 nF to 100 nF
decoupling capacitor next to the V CC pin for proper
operation. The hysteresis between V CC(on) and V CC(min) is
small because the NCP1910 is supposed to be biased by
external power source. Therefore it is recommended to
make a low ? voltage source to bias NCP1910, e.g. the
standby power supply.
Thermal Shutdown
An internal thermal circuitry disables the circuit gate drive
and then keeps the power switch off when the junction
temperature exceeds TSD level. The output stage is then
enabled once the temperature drops below typically 110 ° C
(i.e. TSD ? TSD hyste ). The thermal shutdown is provided to
prevent possible device failures that could result from an
accidental over ? heating.
5 V Reference
The V REF pin provides an accurate ( ± 2% typically) 5 V
reference voltage. The Power ? Good and Brown ? Out of
LLC converter, and the frequency foldback level (fold pin)
of PFC can hence can get an accurate reference voltage by
resistor dividers.
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