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NCP1083
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8
Table 3. OPERATING CONDITIONS
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
UVLO
Vuvlo_on
Default turn on voltage (VportP rising)
UVLO pin tied to VPORTN
1,2

38
40
V
Vuvlo_off
Default turn off voltage (VportP falling)
UVLO pin tied to VPORTN
1,2
29.5
32

V
Vhyst_int
UVLO internal hysteresis
UVLO pin tied to VPORTN
1,2

6

V
Vuvlo_pr
UVLO external programming range
UVLO pin connected to the res-
istor divider (R1 & R2).
AUX pin tied to VPORTN
1,2
For information only
13

50
V
Vuvlo_pr_aux
UVLO external programming VPORT
range with auxiliary supply support
UVLO & AUX pins configured
for auxiliary supply support
8.5

18
V
Vhyst_ext
UVLO external hysteresis
UVLO pin connected to the res-
istor divider (R1 & R2)

15

%
Uvlo_Filter
UVLO on/off filter time
For information only

90

mS
AUXILIARY SUPPLY OPERATION  INPUT SUPPLY
Vaux_min1
VPORTPARTN voltage at startup
(required for VDDH > VDDH_Por_R)
VAUX rising  No external load
on VDDL & VDDH
8.7


V
Vaux_min2
VPORTPARTN voltage during PWM
operation
(required for VDDH > VDDH_Por_F)
Voltage with respect to
Ivddl_load1 & Ivddh_load1 for
the load current conditions
8.5


V
AUXILIARY SUPPLY OPERATION  AUX PIN
Vaux_off
Voltage range of the AUX pin where the
auxiliary supply circuit is guaranteed
not operational.
Voltage with respect to
VPORTN
1,2.


0.2
V
Vaux_on
Voltage range of the AUX pin where the
auxiliary supply circuit is guaranteed
operational.
Voltage with respect to
VPORTN
1,2
1.5

3.3
V
Raux
Total resistance value of the resistor di-
vider connected to the AUX pin (sum of
R
aux1
 and R
aux3
)
Between VAUX supply &
VPORTN
1,2


25
kW
AUXILIARY SUPPLY OPERATION  VDDL REGULATOR
Ivddl_load1
Current load on the VDDL pin with
VPORTP  ARTN = 8.5 V
(Notes 9 and 10)
Ivddh_load + Ivddl_load <
4.5 mA


1
mA
Ivddl_load2
Current load on the VDDL pin with
VPORTP  ARTN > 12.5 V
(Notes 9 and 10)
Ivddh_load + Ivddl_load <
10 mA


2.25
mA
AUXILIARY SUPPLY OPERATION  VDDH REGULATOR
Ivddh_load1
Current load on the VDDH regulator
with VPORTP  ARTN = 8.5 V
(Notes 9 and 10)
Ivddh_load + Ivddl_load <
4.5 mA


4.5
mA
Ivddh_load2
Current load on the VDDH regulator
with VPORTP  ARTN > 12.5 V
(Notes 9 and 10)
Ivddh_load + Ivddl_load <
10 mA


10
mA
9.  Ivddl_load = current flowing out of the VDDL pin.
Ivddh_load = current flowing out of the VDDH pin + current delivered to the Gate Driver (function of the frequency, VDDH voltage & MOSFET
gate capacitance).
10.See Figures 6 and 7 for specifications on the load current at lower or higher VPORTP - ARTN voltages. In case the application requires more
current capability on VDDL and VDDH, it is recommended to externally supply the VDDH pin with a bias winding from the transformer or
to add a diode between VAUX(+) and VDDH pin (verify the VAUX voltage does not exceed the VDDH voltage range).
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