ncp1081 ON Semiconductor, ncp1081 Datasheet - Page 9

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ncp1081

Manufacturer Part Number
ncp1081
Description
Integrated High Power Poe-pd Interface & Dc-dc Converter Controller
Manufacturer
ON Semiconductor
Datasheet

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0
10. Power dissipation must be considered. Load on VDDH and VDDL must be limited especially if VDDH is not powered by an auxiliary winding.
11. Ivddl_load = current flowing out of the VDDL pin.
Table 3. Operating Conditions
VDDH REGULATOR
VDDL REGULATOR
GATE DRIVER
PWM COMPARATOR
ERROR AMPLIFIER
SOFT−START
CURRENT LIMIT COMPARATOR
OSCILLATOR
VDDH_reg
VDDH_Off
VDDH_lim
VDDH_Por_R
VDDH_Por_F
VDDH_ovlo
VDDL_reg
VDDL_Por_R
VDDL_Por_F
Gate_Tr
Gate_Tf
VCOMP
Vbg_fb
Av_ol
GBW
Vss
Vss_r
Iss
CSth
Tblank
DutyC
Frange
F_acc
Ivddh_load = current flowing out of the VDDH pin + current delivered to the Gate Driver (function of the frequency, VDDH voltage & MOSFET
gate capacitance).
Symbol
Regulator output voltage
(Notes 10 and 11)
Ivddh_load + Ivddl_load < 10 mA
with
0 < Ivddl_load < 2.25 mA
Regulator turn−off voltage
VDDH regulator current limit
(Notes 10 and 11)
VDDH POR level (rising)
VDDH POR level (falling)
VDDH over−voltage level (rising)
Regulator output voltage
(Notes 10 and 11)
0 < lvddl_load < 2.25 mA
with
lvddh_load + Ivddl_load < 10 mA
VDDL POR level (rising)
VDDL POR level (falling)
GATE rise time (10−90%)
GATE fall time (90−10%)
COMP control voltage range
Reference voltage
DC open loop gain
Error amplifier GBW
Soft−start voltage range
Soft−start low threshold (rising edge)
Soft−start source current
CS threshold voltage
Blanking time
Maximum duty cycle
Oscillator frequency range
Oscillator frequency accuracy
Parameter
http://onsemi.com
VDDL
– 0.2
Min.
3.05
1.15
0.35
324
100
8.4
7.3
2.5
1.3
13
16
6
1
3
9
VDDH_reg
+ 0.5 V
Typ.
80%
1.15
0.45
360
100
±25
3.3
1.2
80
9
5
VDDL
– 0.02
Max.
18.5
3.55
1.25
0.55
396
500
9.6
8.3
2.9
26
50
50
7
3
7
Units
MHz
kHz
mA
mV
dB
mA
nS
ns
ns
%
V
V
V
V
V
V
V
V
V
V
V
V
For information only
Cload = 2 nF,
VDDHreg = 9 V
Cload = 2 nF,
VDDHreg = 9 V
For information only
Voltage with respect to
ARTN
For information only
For information only
For information only
Fixed internally
Conditions

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