NCP1910
http://onsemi.com
11
ELECTRICAL CHARACTERISTICS (continued)
(For typical values T
J
= 25°C, for min/max values T
J
= −40°C to +125°C, Max T
J
= 150°C, V
CC
= 12 V unless otherwise noted)
Symbol UnitMaxTypMinPinRating
LLC CONTROL SECTION
OSCILLATOR
F
Lsw
Switching Frequency, DT
L
= 300 ns, Rt = 7 kW on R
t
Pin
2 208 245 282 kHz
F
Lsw,max
Maximum Switching Frequency, DT
L
= 300 ns, Rt = 3.5 kW on R
t
Pin
2 424 500 575 kHz
DC
L
Operating Duty-Cycle Symmetry 23, 20 48 50 52 %
V
refRt
Reference Voltage for Oscillator Charging Current Generation 2 3.33 3.5 3.67 V
R
SS
Discharge Switch Resistance 1 − 70 −
W
SS
RST
Soft-Start Reset Voltage 1 − 200 − mV
V
Skip
Skip Cycle Threshold, B Version Only 16 350 400 450 mV
V
skip,hyste
Hysteresis Level on Skip Cycle Comparator, B Version Only 16 − 50 − mV
DRIVE OUTPUT
T
Lr
Output Voltage Rise-Time @ C
L
= 1 nF, 10−90% of Output Signal 23, 20 − 40 − ns
T
Lf
Output Voltage Fall-Time @ C
L
= 1 nF, 10−90% of Output Signal 23, 20 − 20 − ns
R
LOH
Source Resistance 23, 20 − 12 26
W
R
LOL
Sink Resistance 23, 20 − 5 11
W
DT
L
Dead Time, Measured between 50% of the Rise and Fall Edge 23, 20 268 327 386 ns
I
HV,leak
Leakage Current on High Voltage Pins to GND (600 Vdc) 22, 23, 24 − − 5
mA
PROTECTIONS
I
BOadj
Input Bias Current, BOadj Pin 5 − 15 − nA
V
BOadjH
BO Comparator Hysteresis 5 − 100 − mV
t
BOK
BO Comparator Integrating Filter Time Constant from High to Low 5 − 150 −
ms
t
BONOTOK
BO Comparator Integrating Filter Time Constant from Low to High 5 − 20 −
ms
V
CS1
Current-Sense Pin Level that Resets the Soft-Start Capacitor 15 0.95 1 1.05 V
V
CS2
Current-Sense Pin Level that Permanently Latches Off the Circuit 15 1.42 1.5 1.58 V
t
CS
Propagation Delay from VCS1/2 Activation to Respective Action 15 − − 500 ns
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
3. In normal operation, when the power supply is un-plugged, the bulk voltage goes down. At a first crossed level, the PG pin opens. Later,
when the bulk crosses a second level, the LLC turns off. There is no timing link between these events, except the bulk capacitor discharge
slope. However, if for an unknown reason the PFC is disabled (fault, short-circuit), the PG pin immediately opens and if sufficient voltage
is still present on the bulk (e.g. in high line condition), the LLC will be disabled after a typical time of 5 ms.
4. Guaranteed by design.
