NCP1246 ONSEMI [ON Semiconductor], NCP1246 Datasheet - Page 5

• Manufacturer Part Number: NCP1246
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

ELECTRICAL CHARACTERISTICS
V
HIGH VOLTAGE CURRENT SOURCE
SUPPLY
BROWNïOUT
X2 DISCHARGE
OSCILLATOR
6. Internal supply current only, currents sourced via FB pin is not included (current is flowing in GND pin only).
7. Guaranteed by design.
8. CS pin source current is a sum of I
Minimum voltage for current source
operation
Current flowing out of V
Offïstate leakage current
Offïmode HV supply current
HV current source regulation threshold
Turnïon threshold level, V
HV current source stop threshold
HV current source restart threshold
Turnïoff threshold
Overvoltage threshold
Blanking duration on V
detection
V
logic resets
V
Internal current consumption (Note 6)
BrownïOut thresholds
Timer duration for line cycle dropïout
Comparator hysteresis observed at HV pin
HV signal sampling period
Timer duration for no line detection
Discharge timer duration
Oscillator frequency
Maximum on time for T
only
Maximum on time
CC
CC
CC
= 11 V unless otherwise noted)
decreasing level at which the internal
level for I
START1
Characteristics
to I
CC(off)
J
CC
START2
= 25°C to +125°C
CC
pin
and V
going up
transition
CC(ovp)
bias
(For typical values T
and I
OPC
Off mode (skip or before startïup)
Cdrv = 1 nF, V
DRV open, V
Cdrv = 1 nF, V
DRV open, V
, thus at V
V
Fault mode (fault or latch)
V
CC
V
HV
CC
loaded by 4.7 mF cap
V
Test Condition
= 500 V, V
f
f
f
OSC
f
OSC
http://onsemi.com
V
HV
OSC
OSC
V
V
= V
HV
V
HV
HV
HV
CC
going down
J
CC(on)
= 100 kHz
= 100 kHz
FB
NCP1246
going up
= 65 kHz
= 65 kHz
= 141 V,
= 325 V,
FB
FB
= 25°C, for min/max values T
FB
= 125 V is observed the I
= 0 V
= 3 V, 100 kHz
= 3 V, 65 kHz
= 3 V, 100 kHz
= 3 V, 65 kHz
CC
5
ï 0.5 V
= 15 V
t
t
t
ONmax(100kHz)
t
ONmax(100kHz)
ONmax(65kHz)
ONmax(65kHz)
t
V
V
VCC(blank)
V
V
V
V
V
V
Symbol
V
I
V
V
CC(inhibit)
T
start(off)
I
CC(reset)
HV(start)
HV(stop)
HV(hyst)
HV(min)
I
I
HV(off)
CC(min)
CC(ovp)
CC(reg)
sample
f
bias
CC(on)
CC(off)
I
I
t
start1
start2
I
I
I
I
t
t
OSC
CC
CC
CC
CC
CC3
CC4
DET
DIS
HV
J
1
1
2
2
only, because I
= ï40°C to +125°C, V
11.0
0.67
11.5
11.3
Min
102
0.2
9.5
8.5
4.8
0.2
1.3
1.3
1.8
2.3
0.3
1.5
7.5
7.4
10
25
94
43
21
21
58
87
ï
5
ï
ï
8
7
ï
OPC
12.0
10.5
26.5
1.85
1.85
12.3
12.3
Typ
103
100
is switched off.
111
0.5
8.9
7.0
0.8
2.6
2.9
0.9
0.6
3.5
1.0
8.0
8.0
30
25
45
50
11
10
32
32
65
8
ï
HV
= 125 V,
Max
13.0
1.25
1.13
13.1
13.1
11.5
120
109
112
0.8
9.3
7.7
2.2
2.2
3.0
3.5
0.9
8.5
8.5
40
11
50
60
70
28
13
86
43
43
72
ï
5
ï
Unit
kHz
mA
mA
ms
ms
ms
ms
mA
mA
ms
ms
ms
V
V
V
V
V
V
V
V
V
V