NCP1271
ELECTRICAL CHARACTERISTICS (continued) (For typical values T = 25°C, for min/max values, T = −40°C to +125°C,
J
J
V
CC
= 14 V, HV = open, skip = open, FB = 2 V, CS = Ground, DRV = 1 nF, unless otherwise noted.)
Characteristic
Pin
Symbol
Min
Typ
Max
Unit
STARTUP CURRENT SOURCE
High−Voltage Current Source
Inhibit Voltage (I = 200 mA, HV = 50 V)
6
6
6
8
V
190
80
3.0
10
600
200
4.1
25
800
350
6.0
50
mV
mA
mA
mA
CC
inhibit
I
inhibit
I
Inhibit Current (V = 0 V, HV = 50 V)
CC
Startup (V = V
− 0.2 V, HV = 50 V)
CC
CC(on)
HV
I
HV−leak
Leakage (V = 14 V, HV = 500 V)
CC
Minimum Startup Voltage (V = V
– 0.2 V, I = 0.5 mA)
8
V
−
20
28
V
CC
CC(on)
CC
HV(min)
SUPPLY SECTION
V
CC
Regulation
6
Startup Threshold, V Increasing
V
V
11.2
8.2
3.0
5.0
−
12.6
9.1
3.6
5.8
4.0
13.8
10
4.2
6.5
−
V
V
V
V
V
CC
CC(on)
CC(off)
Minimum Operating Voltage After Turn−On
Operating Hysteresis
V
CC
V
− V
CC(on)
CC(off)
Undervoltage Lockout Threshold Voltage, V Decreasing
V
CC
CC(latch)
V
CC(reset)
Logic Reset Level (V
–V
CC(reset)
> 1.0 V) (Note 7)
CC(latch)
V
CC
Supply Current
6
Operating (V = 14 V, 1.0 nF Load, V = 2.0 V, 65 kHz Version)
I
I
I
I
−
−
−
−
2.3
3.1
1.3
500
3.0
3.5
2.0
720
mA
mA
mA
mA
CC
FB
CC1
CC1
CC2
CC3
Operating (V = 14 V, 1.0 nF Load, V = 2.0 V, 100 kHz Version)
CC
FB
Output Stays Low (V = 14 V, V = 0 V)
CC
FB
Latchoff Phase (V = 7.0 V, V = 2.0 V)
CC
FB
7. Guaranteed by design.
TYPICAL CHARACTERISTICS
110
100
90
85
84
100 kHz
83
82
81
80
79
80
70
78
65 kHz
77
76
75
60
50
−50
−25
0
25
50
75
100
125
−50
−25
0
25
50
75
100
125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 3. Oscillation Frequency vs.
Temperature
Figure 4. Maximum Duty Cycle vs.
Temperature
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6
ETC [ ETC ]
