ncp1910 ON Semiconductor, ncp1910 Datasheet - Page 35

• Manufacturer Part Number: ncp1910
• Description: Ncp1910 High Performance Combo Controller For Atx Power Supplies
• Manufacturer: ON Semiconductor

V
to prevent the circuit from operating when V
order to ensure a proper operation. An UVLO comparator
monitors V
when V
Bias the Controller
decoupling capacitor next to the V
operation. The hysteresis between V
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
and then keeps the power switch off when the junction
CC
The device incorporates an Under−Voltage Lockout block
It is recommended to add a typical 1 nF to 100 nF
An internal thermal circuitry disables the circuit gate drive
Under−Voltage LockOut (UVLO)
CC
CC
exceeds V
pin voltage to allow the NCP1910 to operate
State
State
I
I
CC
CC
CC(on)
. The comparator incorporates
< 100mA
ON
TBD
OFF
Figure 63. V
CC(on)
CC
V
Figure 62. Remote on/off (on/off Pin)
pin for proper
V
and V
CC(min)
CC
on
is too low in
CC
CC(min)
http://onsemi.com
Under−Voltage LockOut (UVLO)
is
35
some hysteresis (V
the V
UVLO comparator lower threshold (V
turns off. It is illustrated in Figure 63. After startup, the
operating range is between 9 V and 20 V.
temperature exceeds TSD level. The output stage is then
enabled once the temperature drops below typically 110°C
(i.e. TSD − TSD
prevent possible device failures that could result from an
accidental over−heating.
5 V Reference
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.
V
V
off
The V
CC(on)
< 600 mA
CC
OFF
REF
TBD
crosses the threshold. When V
ON
pin provides an accurate ($ 2% typically) 5 V
hyste
CC(Hys)
On/off pin
). The thermal shutdown is provided to
On/off pin
V
V
) to prevent erratic operation as
CC
CC
CC(min)
CC
goes below the
), the circuit