NCP1910
http://onsemi.com
35
V
CC
State
ON
V
CC(min)
V
CC(on)
I
CC
TBD
< 100mA
OFF
Figure 63. V
CC
Under-Voltage LockOut (UVLO)
V
CC
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.
Latched Protections and Reset
As depicated in the above sections, there are 3 fault modes
that latch off both PFC and LLC:
• PFC abnormal
• PFC OVP2
• LLC CS/FF pin is above V
CS2
To release from the latch-off mode, NCP1910 offers 3
ways:
• Recycle V
CC
so that V
CC
is below V
CC(min)
and back
to above V
CC(on)
again.
• Recycle the remote on/off function, which toggles
on/off pin high and low again.
• Recycle the line brown-out function, which could be
done by unplug and re-plug the ac input.
ORDERING INFORMATION
Device Version Marking Package Shipping
†
NCP1910A65DWR2G 65 kHz − A NCP1910A65 SOIC−24 WB Less Pin 21
(Pb-Free)
1000 / Tape & Reel
NCP1910B65DWR2G 65 kHz − B NCP1910B65 SOIC−24 WB Less Pin 21
(Pb-Free)
1000 / Tape & Reel
NCP1910A100DWR2G 100 kHz − A NCP1910A10 SOIC−24 WB Less Pin 21
(Pb-Free)
1000 / Tape & Reel
NCP1910B100DWR2G 100 kHz − B NCP1910B10 SOIC−24 WB Less Pin 21
(Pb-Free)
1000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
