ncp1082 ON Semiconductor, ncp1082 Datasheet - Page 8

• Manufacturer Part Number: ncp1082
• Description: Integrated Poe-pd & Dc-dc Converter Controller With 9v Auxiliary Supply Support
• Manufacturer: ON Semiconductor

7. Ivddl_load = current flowing out of the VDDL pin.
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
9. The current value corresponds to the PoE−PD input current (the current flowing in the external Rdet and the quiescent current of the device
Table 3. Operating Conditions
AUXILIARY SUPPLY OPERATION – AUX PIN
AUXILIARY SUPPLY OPERATION – VDDL REGULATOR
AUXILIARY SUPPLY OPERATION – VDDH REGULATOR
PASS−SWITCH AND CURRENT LIMITS
INRUSH AND ILIM1 CURRENT LIMIT TRANSITION
AUX_threshold
AUX_bias_min
AUX_bias_max
AUX_res_ladder
Ivddl_load1
Ivddl_load2
Ivddh_load1
Ivddh_load2
Ron
I_Rinrush1
I_Rinrush2
I_Rilim1
Vds_pgood
Vds_pgood_hyst
Ivddh_load = current flowing out of the VDDH pin + current delivered to the Gate Driver (function of the frequency, VDDH voltage & MOSFET
gate capacitance).
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).
are included).
Symbol
AUX pin internal threshold
Minimum Voltage required on the AUX
pin for low auxiliary supply operation
Maximum Voltage allowed on the AUX pin
Resistor ladder value on AUX pin
Current load on the VDDL pin with
VPORTP − ARTN = 8.5 V (Notes 7 and 8)
Current load on the VDDL pin with
VPORTP − ARTN > 12.5 V
(Notes 7 and 8)
Current load on the VDDH regulator with
VPORTP − ARTN = 8.5 V (Notes 7 and 8)
Current load on the VDDH regulator with
VPORTP − ARTN > 12.5 V
(Notes 7 and 8)
Pass−switch Rds−on
Rinrush = 150 kW (Note 9)
Rinrush = 57.6 kW (Note 9)
Rilim1 = 84.5 kW (Note 9)
VDS required for power good status
VDS hysteresis required for power good
status
Parameter
http://onsemi.com
8
Min.
260
450
0.2
1.5
0.8
95
−
−
−
−
−
−
−
−
Typ.
125
310
510
0.6
8.2
−
−
−
−
−
−
−
−
1
Max.
2.25
155
360
570
1.5
3.3
4.5
1.2
1.2
25
10
−
1
−
Units
mA
mA
mA
mA
mA
mA
mA
kW
W
V
V
V
V
V
Voltage with respect to
VPORTN
Defined at VPORT = 8.5 V,
Voltage with respect to
VPORTN
Voltage with respect to
VPORTN
Between VAUX supply &
VPORTN
Ivddh_load + Ivddl_load
< 4.5 mA
Ivddh_load + Ivddl_load
< 10 mA
Ivddh_load + Ivddl_load
< 4.5 mA
Ivddh_load + Ivddl_load
< 10 mA
Max Ron specified at
Tj = 130°C
Measured at RTN−
VPORTN
Measured at RTN−
VPORTN
Current limit threshold
RTN−VPORTNx falling;
voltage with respect to
VPORTN
Voltage with respect to
VPORTN
Conditions
1,2.
1,2
1,2
1,2
1,2
1,2
1,2
1,2
= 3 V
= 3 V