NCP1239
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS
(For typical values T
J
= 25
°
C, for min/max values T
J
= 0
°
C to +125
°
C, V
pin16
= 48 V,
V
CC
= 20 V unless otherwise noted.)
Symbol
Unit
Max
Typ
Min
Pin
Rating
Drive Output
Vcl
Output Voltage Positive Clamp
12
11.5
13.6
16
V
T
rise
Output Voltage Rise−Time @ CL = 1 nF, 10−90% of output signal
12
−
40
−
ns
T
fall
Output Voltage Fall−Time @ CL = 1 nF, 10−90% of output signal
12
−
25
−
ns
V
source
High State Voltage Drop @ I
pin12
= 3 mA and V
CC
= 12 V
12
−
2.5
3.3
V
I
source
Source Current Capability (@ V
pin12
= 0 V)
12
−
500
−
mA
R
OL
Sink Resistance @ V
pin12
=1 V
12
−
3.8
7.5
I
sink
Sink Current Capability (@ V
pin12
= 10 V)
12
−
800
−
mA
Oscillator
fsw
Recommended Switching Frequency Range
12
25
−
250
kHz
Vosc
Pin 4 Voltage @ Rt = 100 k
4
−
1.6
−
V
Kosc
Product (Switching Frequency times the Rt Pin 4 resistance) (Note 1)
@ 65 kHz and 130 kHz (NCP1239F)
@ 118 kHz and 236 kHz (NCP1239V)
6050
11000
6500
11800
6950
12600
kHz*k
fsw
Internal Modulation Swing, in percentage of fsw
−
±
3.5
−
%
Dmax
Maximum Duty−Cycle
75.5
80.0
83.0
%
Current Limitation
I
Limit
Maximum Internal Set−Point
10
0.84
0.90
0.95
V
T
DEL_CS
Propagation Delay from V
pin10
> I
Limit
to gate turned off
(Pin 12 loaded by 1 nF)
10
−
130
220
ns
T
LEB−65kHz
Leading Edge Blanking Duration (Pins 9 and 10) @ 65 kHz
(NCP1239F)
9, 10
−
420
−
ns
T
LEB−130kHz
Leading Edge Blanking Duration (Pins 9 and 10) @ 130 kHz
(NCP1239F)
9, 10
−
230
−
ns
T
LEB−118kHz
Leading Edge Blanking Duration (Pin 10) @ 118 kHz (NCP1239V)
10
−
320
−
ns
T
LEB−236kHz
Leading Edge Blanking Duration (Pin 10) @ 236 kHz (NCP1239V)
10
−
170
−
ns
Over Power Limit (NCP1239F)
I
ocp
Internal Current Source of the Over Power Limit Pin
@ 1 V on Pin 5 and V
pin9
= 0.5 V
@ 2 V on Pin 5 and V
pin9
= 0.5 V
9
60
120
80
160
100
185
A
V
opl
Over Power Limitation Threshold
@ T
J
= 25
°
C
@ T
J
= 0
°
C to 125
°
C
9
0.48
0.47
0.50
0.50
0.52
0.52
V
T
DEL_OCP
Propagation Delay from V
pin9
> V
opl
to gate turned off
(Pin 12 loaded by 1 nF)
9
−
130
220
ns
Maximum Duty−Cycle (Dmax) Control (NCP1239V)
I
Dmax
Pin 9 Current Source @ V
pin9
= 1.0 V and V
pin9
= 2.0 V
9
46
55
63
A
D
max
Maximum Duty Cycle @ 118 kHz and V
pin9
= 1.0 V
9
20
24
29
%
K
Dmax
Dmax Coefficient @ 118 kHz and V
pin9
= 1.0 V (Note 2)
9
1.10
1.30
1.53
%/k
1. The nominal switching frequency fsw equals: fsw = K
OSC
/Rt. The implemented jittering makes the switching frequency continuously vary
around this nominal value (
$
3.5% variation).
2. K
Dmax
is the proportionality coefficient that links the maximum duty−cycle to the Pin 9 resistor: Dmax = K
Dmax
*R
pin9
. K
Dmax
is defined in
the “Maximum Duty−Cycle Limitation” section of the operating description.
