NCP1234 ONSEMI [ON Semiconductor], NCP1234 Datasheet - Page 5

• Manufacturer Part Number: NCP1234
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

ELECTRICAL CHARACTERISTICS
V
HIGH VOLTAGE CURRENT SOURCE
SUPPLY
OSCILLATOR
OUTPUT DRIVER
6. internal supply current only, current in FB pin not included (current flowing in GND pin only).
Minimum voltage for current
source operation
Current flowing out of V
Off−state leakage current
Turn−on threshold level, V
going up
HV current source stop threshold
HV current source restart
threshold
Turn−off threshold
Overvoltage threshold
Blanking duration on V
V
V
the internal logic resets
V
transition
Internal current consumption
(Note 6)
Oscillator frequency
Maximum duty cycle
Frequency jittering amplitude, in
percentage of F
Frequency jittering modulation
frequency
Rise time, 10% to 90 % of V
Fall time, 90% to 10 % of V
Current capability
Clamping voltage (maximum
gate voltage)
High−state voltage drop
CC
CC(ovp)
CC
CC
= 11 V unless otherwise noted)
decreasing level at which
level for I
Characteristics
detection
START1
OSC
to I
CC(off)
CC
START2
CC
pin
CC
CC
and
V
V
V
DRV open, V
DRV open, V
C
C
Off mode (skip or before start−up)
Fault mode (fault or latch)
V
V
V
DRV high, V
DRV low, V
V
R
V
DRV high
CC
CC
HV
CC
CC
CC
CC
CC
drv
drv
DRV
(For typical values T
= 0 V
= V
= 500 V
= V
= V
= V
= V
= V
= 1 nF, V
= 1 nF, V
= 33 kW, C
CC(on)
CC(min)
CC(min)
CC(min)
CCmax
CC(min)
DRV
Test Condition
DRV
FB
FB
FB
FB
− 0.5 V
– 0.2 V, DRV high,
+ 0.2 V, C
+ 0.2 V, C
+ 0.2 V, C
= V
+ 0.2 V, R
= 3 V, 65 kHz
= 3 V, 100 kHz
= 3 V, 65 kHz
= 3 V, 100 kHz
= 0 V
load
http://onsemi.com
CC
= 220 pF
J
= 25C, for min/max values T
DRV
DRV
DRV
DRV
5
= 1 nF
= 1 nF
= 1 nF
= 33 kW,
V
I
V
t
V
DRV(source)
V
I
VCC(blank)
V
V
V
DRV(clamp)
Symbol
DRV(sink)
I
V
V
DRV(drop)
CC(inhibit)
CC(reset)
start(off)
D
HV(min)
I
I
CC(min)
CC(ovp)
A
f
F
CC(on)
CC(off)
I
I
I
I
I
I
start1
start2
t
OSC
CC1
CC1
CC2
CC2
CC3
CC4
t
MAX
rise
jitter
jitter
fall
J
= −40C to +125C, V
0.67
11.0
Min
0.2
9.5
8.5
3.6
0.4
1.2
1.3
1.9
2.2
0.4
25
60
92
75
4
85
11
−
3
−
7
−
−
−
−
−
12.0
10.5
26.5
13.5
Typ
100
125
500
500
0.5
9.5
5.0
1.0
1.8
1.9
2.5
2.9
0.9
0.7
30
25
10
65
80
6
40
40
6
−
HV
= 125 V,
Max
13.0
10.5
1.13
11.5
108
165
0.8
6.0
1.6
2.2
2.3
3.2
3.6
1.0
60
50
28
13
70
85
8
70
70
16
9
−
−
1
Unit
kHz
mA
mA
mA
mA
Hz
ms
ns
ns
%
%
V
V
V
V
V
V
V
V
V