NCP1246 ONSEMI [ON Semiconductor], NCP1246 Datasheet - Page 6

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

ELECTRICAL CHARACTERISTICS
V
OSCILLATOR
FREQUENCY FOLDBACK
OUTPUT DRIVER
CURRENT SENSE
INTERNAL SLOPE COMPENSATION
FEEDBACK
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
Maximum duty cycle (corresponding to
maximum on time at maximum switching
frequency)
Frequency jittering amplitude, in percentage
of F
Frequency jittering modulation frequency
Feedback voltage threshold below which
frequency foldback starts
Feedback voltage threshold below which
frequency foldback is complete
Minimum switching frequency
Rise time, 10 to 90% of V
Fall time, 90 to 10% of V
Current capability
Clamping voltage (maximum gate voltage)
Highïstate voltage drop
Input Pullïup Current
Maximum internal current setpoint
Propagation delay from V
DRV off
Leading Edge Blanking Duration for V
(Note 7)
Threshold for immediate fault protection
activation
Leading Edge Blanking Duration for V
Softïstart duration
Frozen current setpoint
Slope of the compensation ramp
Internal pullïup resistor
V
CC
FB
OSC
= 11 V unless otherwise noted)
to internal current setpoint division ratio
Characteristics
CC
CC
Ilimit
detection to
ILIM
CS(stop)
bias
(For typical values T
and I
OPC
V
CC
R
From 1
, thus at V
DRV
R
V
V
V
= V
V
DRV high, V
DRV low, V
DRV
CC
CC
CC
CC
V
= 33 kW, C
CCmax
FB
Test Condition
f
st
= V
= V
= V
f
OSC
http://onsemi.com
= V
OSC
C
C
C
= 33 kW, DRV high
V
V
V
pulse to V
= V
T
DRV
DRV
DRV
CS
FB
CS
CC(min)
CC(min)
CC(min)
HV
J
CC(min)
J
= 100 kHz
NCP1246
= 25°C
= 65 kHz
skip(in)
– 0.2 V, DRV high,
> 3.5 V
= 25°C, for min/max values T
= 0.7 V
= V
= 125 V is observed the I
= 1 nF
= 1 nF
= 1 nF
DRV
DRV
load
ILIM
6
+ 0.2 V,
+ 0.2 V,
+ 0.2 V,
+ 0.2 V,
CS
+ 0.1
= V
= 0 V
= 220 pF
= V
CC
ILIM
S
S
V
I
V
comp(100kHz)
DRV(source)
V
V
comp(65kHz)
I
f
V
DRV(clamp)
V
Symbol
OSC(min)
DRV(sink)
t
DRV(drop)
R
FB(foldS)
FB(foldE)
SSTART
D
CS(stop)
I(freeze)
A
F
V
t
bias
t
t
I
delay
FB(up)
K
t
BCS
t
bias
LEB
MAX
jitter
rise
ILIM
jitter
fall
FB
J
only, because I
= ï40°C to +125°C, V
0.66
0.95
Min
200
275
1.8
0.8
4.7
±4
85
23
90
15
11
ï
ï
ï
ï
ï
ï
ï
ï
8
ï
ï
OPC
ï32.5
13.5
0.70
1.05
Typ
125
500
800
250
120
300
ï50
is switched off.
2.0
0.9
80
±6
27
40
40
80
11
20
ï
1
5
HV
= 125 V,
Max
0.74
1.15
165
320
150
325
110
2.2
1.0
5.3
±8
32
70
70
16
14
25
ï
ï
ï
1
ï
ï
ï
mV /
Unit
kHz
mA
mV
ms
kW
Hz
mA
ns
ns
ns
ns
ns
ms
%
%
V
V
V
V
V
V
ï