NCP1080
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9
Table 3. OPERATING CONDITIONS
Symbol
Parameter
Min.
Typ.
Max.
Units
Conditions
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
%
CURRENT CONSUMPTION
IvportP
1
VPORTP internal current consumption
(Note 10)
2.5
3.5
mA
DCDC controller off
IvportP
2
VPORTP internal current consumption
(Note 11)
4.7
6.5
mA
DCDC controller on
THERMAL SHUTDOWN
TSD
Thermal shutdown threshold
150
癈 Tj
T
J
= junction temperature
Thyst
Thermal hysteresis
15
癈 Tj
T
J
= junction temperature
THERMAL RATINGS
T
A
Ambient temperature
40
85
癈
T
J
Junction temperature
125
150
癈
癈
Parametric values guaranteed
Max 1000 hours
10.Conditions
a. No current through the passswitch
b. DCDC controller inactive (SS shorted to RTN)
c. No external load on VDDH and VDDL
d. VPORTP = 57 V
11.Conditions
a. No current through the passswitch
b. Oscillator frequency = 100 kHz
c. No external load on VDDH and VDDL
d. Aux winding not used
e. 2 nF on GATE, DCDC controller enabled
f. VPORTP = 57 V
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