NCP1246 ONSEMI [ON Semiconductor], NCP1246 Datasheet - Page 7

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

ELECTRICAL CHARACTERISTICS
V
FEEDBACK
SKIP CYCLE MODE
REMOTE CONTROL ON FB PIN
OVERLOAD PROTECTION
OVERPOWER PROTECTION
LATCHïOFF INPUT
TEMPERATURE SHUTDOWN
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
Internal pullïup voltage on the FB pin
(Note 7)
Feedback voltage below which the peak
current is frozen
Feedback voltage thresholds for skip mode
The voltage above which the part enters the
on mode
The voltage below which the part enters the
off mode
Minimum hysteresis between the V
V
Pullïup current in off mode
Go To Off mode timer
Fault timer duration
Autorecovery mode latchïoff time duration
V
Current flowing out of CS pin (Note 8)
FB voltage above which I
FB voltage below which is no I
High threshold
Low threshold
Current source for direct NTC connection
Blanking duration on high latch detection
Blanking duration on low latch detection
Clamping voltage
Temperature shutdown
Temperature shutdown hysteresis
CC
OFF
HV
= 11 V unless otherwise noted)
to I
OPC
During normal operation
During softïstart
conversion ratio
Characteristics
OPC
is applied
OPC
ON
applied
bias
and
(For typical values T
and I
OPC
, thus at V
V
V
CC
CC
V
> V
> V
100 kHz version
V
Test Condition
V
Latch
65 kHz version
T
V
V
V
http://onsemi.com
FB
V
I
I
V
V
V
V
V
V
Latch
V
Latch
Latch
T
J
CC
CC
CC
CC(off)
CC(off)
FB
HV
HV
HV
HV
HV
HV
Latch
J
going down
HV
going down
J
going up
going down
> V
> V
> V
NCP1246
going up
= 125 V
= 162 V
= 325 V
= 365 V
= 365 V
= 365 V
= 25°C, for min/max values T
going up
= 0 mA
= 1 mA
= 125 V is observed the I
= 0 V
, V
, V
CC(off)
CC(off)
CC(off)
7
HV
HV
= 60 V
= 60 V
V
V
I
NTC(SSTART)
V
V
V
t
t
clamp0(Latch)
clamp1(Latch)
T
Latch(OVP)
I
I
I
I
Latch(OTP)
V
Symbol
OPC(125)
OPC(162)
OPC(325)
OPC(365)
V
V
FB(freeze)
FB(OPCF)
FB(OPCE)
TSD(HYS)
t
V
t
skip(out)
autorec
K
V
V
V
T
GTOM
bias
skip(in)
I
I
FB(ref)
V
t
HYST
OFF
NTC
fault
OPC
OVP
TSD
OFF
OTP
ON
J
only, because I
= ï40°C to +125°C, V
1.35
0.63
0.72
0.35
0.85
2.12
2.35
0.76
Min
500
100
108
105
130
4.5
1.0
2.0
65
35
20
ï
ï
ï
ï
ï
ï
ï
ï
ï
ï
OPC
0.70
0.80
0.40
1.00
0.54
2.35
2.15
Typ
is switched off.
150
128
110
130
190
350
150
1.5
2.2
2.5
0.8
1.2
2.4
20
95
50
35
30
5
ï
5
0
HV
= 125 V,
Max
1.65
0.77
0.88
0.45
1.35
2.58
2.65
0.84
300
178
150
105
210
5.5
1.4
3.0
70
50
ï
ï
ï
ï
ï
ï
ï
ï
ï
ï
ï
mA / V
Unit
mV
ms
ms
mA
mA
mA
°C
°C
ms
ms
V
V
V
V
V
V
V
V
V
V
s