NCP1082
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8
Table 3. OPERATING CONDITIONS
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
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 7 and 8)
Ivddh_load + Ivddl_load
< 4.5 mA
1
mA
Ivddl_load2
Current load on the VDDL pin with
VPORTP ARTN > 12.5 V
(Notes 7 and 8)
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 7 and 8)
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 7 and 8)
Ivddh_load + Ivddl_load
< 10 mA
10
mA
PASSSWITCH AND CURRENT LIMITS
Ron
Passswitch Rdson
Max Ron specified at
T
J
= 130癈
0.6
1.2
W
I_Rinrush1
Rinrush = 150 kW (Note 9)
Measured at RTN
VPORTN
1,2
= 3 V
95
125
155
mA
I_Rinrush2
Rinrush = 57.6 kW (Note 9)
Measured at RTN
VPORTN
1,2
= 3 V
260
310
360
mA
I_Rilim1
Rilim1 = 84.5 kW (Note 9)
Current limit threshold
450
510
570
mA
INRUSH AND ILIM1 CURRENT LIMIT TRANSITION
Vds_pgood
VDS required for power good status
RTNVPORTNx falling; volt-
age with respect to
VPORTN
1,2
0.8
1
1.2
V
Vds_pgood_hyst
VDS hysteresis required for power good
status
Voltage with respect to
VPORTN
1,2
8.2
V
7. 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).
8. 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).
9. The current value corresponds to the PoEPD input current (the current flowing in the external Rdet and the quiescent current of the device
are included). Resistors are assumed to have 1% accuracy.
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