ncp1234ad100r2g ON Semiconductor, ncp1234ad100r2g Datasheet - Page 6

• Manufacturer Part Number: ncp1234ad100r2g
• Description: Ncp1234 Fixed Frequency Current Mode Controller For Flyback Converters
• Manufacturer: ON Semiconductor

ELECTRICAL CHARACTERISTICS
V
FEEDBACK
CURRENT SENSE
OVERPOWER COMPENSATION
OVERCURRENT PROTECTION
FREQUENCY FOLDBACK
SKIP−CYCLE MODE
Internal pull−up resistor
V
division ratio
Internal pull−up voltage on the
FB pin
Input Bias Current
Maximum internal current
setpoint
Propagation delay from V
detection to DRV off
Leading Edge Blanking Duration
for V
Threshold for immediate fault
protection activation
Leading Edge Blanking Duration
for V
Slope of the compensation ramp
Soft−start duration
V
Current flowing out of CS pin
FB voltage above which I
applied
FB voltage below which is no
I
Watchdog timer for dc operation
HV sampling level
Fault timer duration
Autorecovery mode latch−off
time duration
Feedback voltage threshold
below which frequency foldback
starts
Feedback voltage threshold
below which frequency foldback
is complete
Minimum switching frequency
Feedback voltage thresholds for
skip mode
CC
OPC
FB
HV
= 11 V unless otherwise noted)
to internal current setpoint
ILIM
CS(stop)
to I
applied
OPC
Characteristics
conversion ratio
OPC
Ilimit
is
T
V
V
V
From 1
V
V
V
V
V
V
From CS reaching V
V
V
V
J
CS
FB
CS
HV
HV
HV
HV
HV
HV
FB
FB
FB
= 25°C
(For typical values T
> 3.5 V
= V
going down
going up
= 0.7 V
= V
= 125 V
= 162 V
= 325 V
= 365 V
= 365 V
= 365 V
st
skip(in)
ILIM
pulse to V
Test Condition
+ 0.2
CS
http://onsemi.com
ILIMIT
= V
J
= 25°C, for min/max values T
ILIM
to DRV stop
6
S
S
comp(100kHz)
V
V
V
comp(65kHz)
V
V
V
I
I
I
I
t
f
V
Symbol
t
OPC(125)
OPC(162)
OPC(325)
OPC(365)
WD(OPC)
R
FB(OPCE)
OSC(min)
V
V
FB(OPCF)
HVsample
t
SSTART
FB(foldS)
FB(foldE)
CS(stop)
K
autorec
skip(out)
V
t
t
skip(in)
FB(up)
FB(ref)
I
t
t
K
delay
BCS
bias
LEB
fault
OPC
ILIM
FB
J
= −40°C to +125°C, V
0.66
0.95
2.12
0.85
1.22
0.63
0.72
Min
190
105
4.7
4.3
2.8
1.8
15
90
98
22
−
−
−
−
−
−
−
−
−
−
−
−32.5
0.02
1.05
0.54
2.35
2.15
1.00
1.35
0.80
Typ
250
120
−50
130
128
110
0.7
4.0
2.0
0.7
20
80
20
32
92
27
5
5
0
HV
= 125 V,
Max
0.74
1.15
2.58
1.35
1.48
0.77
0.88
110
310
150
150
168
5.3
5.7
5.2
2.2
25
32
−
−
−
−
−
−
−
−
−
−
mA / V
mV /
Unit
kHz
kW
mA
ms
mA
ms
ms
ns
ns
ns
ms
V
V
V
V
V
V
V
V
V
−
s