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NCP1081
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9
Table 3. OPERATING CONDITIONS
Symbol
Parameter
Min.
Typ.
Max.
Units
Conditions
VDDH REGULATOR
VDDH_reg
Regulator output voltage
(Notes 10 and 11)
Ivddh_load + Ivddl_load < 10 mA
with
0 < Ivddl_load < 2.25 mA
8.4
9
9.6
V
VDDH_Off
Regulator turnoff voltage

VDDH_reg
+ 0.5 V

V
For information only
VDDH_lim
VDDH regulator current limit
(Notes 10 and 11)
13

26
mA
VDDH_Por_R
VDDH POR level (rising)
7.3

8.3
V
VDDH_Por_F
VDDH POR level (falling)
6

7
V
VDDH_ovlo
VDDH overvoltage level (rising)
16

18.5
V
VDDL REGULATOR
VDDL_reg
Regulator output voltage
(Notes 10 and 11)
0 < Ivddl_load < 2.25 mA
with
Ivddh_load + Ivddl_load < 10 mA
3.05
3.3
3.55
V
VDDL_Por_R
VDDL POR level (rising)
VDDL
 0.2

VDDL
 0.02
V
VDDL_Por_F
VDDL POR level (falling)
2.5

2.9
V
GATE DRIVER
Gate_Tr
GATE rise time (1090%)


50
ns
Cload = 2 nF, VDDHreg = 9 V
Gate_Tf
GATE fall time (9010%)


50
ns
Cload = 2 nF, VDDHreg = 9 V
PWM COMPARATOR
VCOMP
COMP control voltage range
1.3

3
V
For information only
ERROR AMPLIFIER
Vbg_fb
Reference voltage
1.15
1.2
1.25
V
Voltage with respect to ARTN
Av_ol
DC open loop gain

80

dB
For information only
GBW
Error amplifier GBW
1


MHz
For information only
SOFTSTART
Vss
Softstart voltage range

1.15

V
Vss_r
Softstart low threshold (rising edge)
0.35
0.45
0.55
V
Iss
Softstart source current
3
5
7
mA
CURRENT LIMIT COMPARATOR
CSth
CS threshold voltage
324
360
396
mV
Tblank
Blanking time

100

ns
For information only
OSCILLATOR
DutyC
Maximum duty cycle

80%

Fixed internally
Frange
Oscillator frequency range
100

500
kHz
F_acc
Oscillator frequency accuracy
?5
%
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.
Ivddh_load = current flowing out of the VDDH pin + current delivered to the Gate Driver (function of the frequency, VDDH voltage & MOSFET
gate capacitance).
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