ncp1083 ON Semiconductor, ncp1083 Datasheet - Page 8

• Manufacturer Part Number: ncp1083
• Description: Integrated High Power Poe-pd Interface & Dc-dc Converter Controller With 9v Auxiliary Supply Support
• Manufacturer: ON Semiconductor

9. Ivddl_load = current flowing out of the VDDL pin.
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
Table 3. Operating Conditions
UVLO
AUXILIARY SUPPLY OPERATION – INPUT SUPPLY
AUXILIARY SUPPLY OPERATION – AUX PIN
AUXILIARY SUPPLY OPERATION – VDDL REGULATOR
AUXILIARY SUPPLY OPERATION – VDDH REGULATOR
Vuvlo_on
Vuvlo_off
Vhyst_int
Vuvlo_pr
Vuvlo_pr_aux
Vhyst_ext
Uvlo_Filter
Vaux_min1
Vaux_min2
Aux_threshold
Aux_bias_min
Aux_bias_max
Aux_res_ladder
Ivddl_load1
Ivddl_load2
Ivddh_load1
Ivddh_load2
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).
Symbol
Default turn on voltage (VportP rising)
Default turn off voltage (VportP falling)
UVLO internal hysteresis
UVLO external programming range
UVLO external programming VPORT
range with auxiliary supply support
UVLO external hysteresis
UVLO on/off filter time
VPORTP−ARTN voltage at startup
(required for VDDH > VDDH_Por_R)
VPORTP−ARTN voltage during PWM
operation
(required for VDDH > VDDH_Por_F)
AUX pin internal threshold
Minimum Voltage required on the AUX
pin for 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 9 and 10)
Current load on the VDDL pin with
VPORTP − ARTN > 12.5 V
(Notes 9 and 10)
Current load on the VDDH regulator
with VPORTP − ARTN = 8.5 V
(Notes 9 and 10)
Current load on the VDDH regulator
with VPORTP − ARTN > 12.5 V
(Notes 9 and 10)
Parameter
http://onsemi.com
Min.
29.5
8.5
8.7
8.5
0.2
1.5
13
−
−
−
−
−
−
−
−
−
−
8
Typ.
38
32
15
90
6
−
−
−
−
−
−
−
−
−
−
−
−
Max.
2.25
1.5
3.3
4.5
40
50
18
25
10
−
−
−
−
−
−
−
1
Units
mA
mA
mA
mA
kW
mS
%
V
V
V
V
V
V
V
V
V
V
UVLO pin tied to VPORTN
UVLO pin tied to VPORTN
UVLO pin tied to VPORTN
UVLO pin connected to the res-
istor divider (R1 & R2).
AUX pin tied to VPORTN
For information only
UVLO & AUX pins configured
for auxiliary supply support
UVLO pin connected to the res-
istor divider (R1 & R2)
For information only
VAUX rising − No external load
on VDDL & VDDH
Voltage with respect to
Ivddl_load1 & Ivddh_load1 for
the load current conditions
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
1,2
1,2
1,2
1,2
Conditions
1,2
1,2
1,2
1,2