NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055
ELECTRICAL CHARACTERISTICS
(V
CC
= 8.0 V, for typical values T
J
= 25°C, for min/max values, T
J
is the operating junction
temperature range that applies (Note 3), unless otherwise noted.)
Characteristics
POWER SWITCH CIRCUIT
Power Switch Circuit On−State Resistance
NCP1050, NCP1051, NCP1052 (I
D
= 50 mA)
T
J
= 25°C
T
J
= 125°C
NCP1053, NCP1054, NCP1055 (I
D
= 100 mA)
T
J
= 25°C
T
J
= 125°C
Power Switch Circuit & Startup Breakdown Voltage
(I
D(off)
= 100
mA,
T
A
= 25°C)
Power Switch Circuit & Startup Circuit Off−State Leakage Current
(V
DS
= 650 V) T
J
= 25°C
(V
DS
= 650 V)
T
J
= 125°C
Switching Characteristics (R
L
= 50
W,
V
DS
set for I
D
= 0.7 I
Iim
)
Turn−on Time (90% to 10%)
Turn−off Time (10% to 90%)
CURRENT LIMIT AND THERMAL PROTECTION
Current Limit Threshold (T
J
= 25°C) (Note 6)
NCP1050
NCP1051
NCP1052
NCP1053
NCP1054
NCP1055
Conversion Power Deviation (T
J
= 25°C) (Note 7)
Propagation Delay, Current Limit Threshold to Power Switch Circuit Output
NCP1050, NCP1051, NCP1052
NCP1053, NCP1054, NCP1055
Thermal Protection (V
CC
= 8.6 V) (Note 3, 4, 5)
Shutdown (Junction Temperature Increasing)
Hysteresis (Junction Temperature Decreasing)
STARTUP CONTROL
Startup/V
CC
Regulation
Startup Threshold/V
CC
Regulation Peak (V
CC
Increasing)
Minimum Operating/V
CC
Valley Voltage After Turn−On
Hysteresis
Undervoltage Lockout Threshold Voltage, V
CC
Decreasing
Startup Circuit Output Current (Power Switch Circuit Output = 40 V)
V
CC
= 0 V
T
J
= 25°C
T
J
= −40 to 125°C
V
CC
= V
CC(on)
− 0.2 V
T
J
= 25°C
T
J
= −40 to 125°C
Minimum Start−up Drain Voltage (I
start
= 0.5 mA, V
CC
= V
CC(on)
− 0.2 V)
Output Fault Condition Auto Restart
(V
CC
Capacitor = 10
mF,
Power Switch Circuit Output = 40 V)
Average Switching Duty Cycle
Frequency
V
V
CC(on)
V
CC(off)
V
H
V
CC(reset)
I
start
5.4
4.5
4.6
3.5
V
start(min)
−
6.3
−
5.6
−
13.4
7.2
8.0
6.6
7.0
20
V
8.0
7.0
−
4.0
8.5
7.5
1.0
4.5
9.0
8.0
−
5.0
V
mA
I
lim
93
186
279
372
493
632
I
2
f
OSC
t
PLH
−
−
T
sd
T
H
140
−
135
160
160
75
−
−
°C
−
−
−
100
200
300
400
530
680
0
107
214
321
428
567
728
10
%A
2
Hz
ns
mA
R
DS(on)
−
−
−
−
V
(BR)DS
I
DS(off)
−
−
t
on
t
off
−
−
25
15
20
10
40
80
ns
−
−
700
22
42
10
23
−
30
55
15
28
−
V
mA
W
Symbol
Min
Typ
Max
Unit
D
rst
f
rst
−
−
6.0
3.5
−
−
%
Hz
3. Tested junction temperature range for the NCP105X series:
T
high
= +125°C
T
low
= −40°C
4. Maximum package power dissipation limits must be observed.
5. Guaranteed by design only.
6. Adjust di/dt to reach I
lim
in 4.0
msec.
7. Consult factory for additional options including test and trim for output power accuracy.
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