NCP1252 ON Semiconductor, NCP1252 Datasheet - Page 4

• Manufacturer Part Number: NCP1252
• Description: Flyback Applications
• Manufacturer: ON Semiconductor

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Table 4. ELECTRICAL CHARATERISTICS
(V
SUPPLY SECTION AND V
Startup threshold at which driving pulses are
authorized
Minimum Operating voltage at which driving
pulses are stopped
Hysteresis between V
Start−up current, controller disabled
Internal IC consumption, controller switching
Internal IC consumption, controller switching
CURRENT COMPARATOR
Current Sense Voltage Threshold
Leading Edge Blanking Duration
Input Bias Current
Propagation delay
Internal Ramp Compensation Voltage level
Internal Ramp Compensation resistance to
CS pin
INTERNAL OSCILLATOR
Oscillator Frequency
Oscillator Frequency
Frequency Modulation in percentage of f
Frequency modulation Period
Maximum operating frequency
Maximum duty−cycle – A version
Maximum duty−cycle – B version
FEEDBACK SECTION
Internal voltage division from FB to CS set-
point
Internal pull−up resistor
FB pin maximum current
Internal feedback impedance from FB to
GND
Open loop feedback voltage
Internal Diode forward voltage
DRIVE OUTPUT
DRV Source resistance
DRV Sink resistance
Output voltage rise−time
3. Guaranteed by design
4. V
CC
ramp
= 15 V, R
, R
ramp
Characteristics
T
= 43 kW, C
Guaranteed by design
CC(on)
DRV
CC
and V
MANAGEMENT
= 1 nF. For typical values T
CC(min)
OSC
F
F
From CS detected to gate
sw
V
sw
CC
V
increasing from zero
=100 kHz, C
=100 kHz, DRV = open
CC
DRV pin = 47 kW
DRV pin = 47 kW
@ 25°C (Note 4)
@ 25°C (Note 4)
Test Condition
V
V
= 15 V, C
R
FB pin = GND
FB pin = open
R
CC
CC
< V
T
T
10 to 90%
turned off
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
= 8.5 kW &
= 43 kW &
decreasing
http://onsemi.com
increasing
CC(on)
J
= 25°C, for min/max values T
DRV
DRV
& V
= 1nF,
4
= 1 nF
CC
V
Symbol
DC
DC
R
V
V
V
CC(HYS)
T
R
V
R
R
FB
V
f
f
f
CC(on)
CC(off)
I
I
I
t
pull−up
t
I
f
swing
Z
OSC
OSC
MAX
FBOL
CC1
CC2
CC3
LEB
ILIM
jitter
I
bias
ramp
ramp
SINK
SRC
ILIM
V
FB
maxA
maxB
t
FB
r
div
f
J
= –25°C to +125°C, unless otherwise noted)
0.92
3.15
45.6
Min
425
500
9.4
8.4
0.9
0.5
2.0
1.5
92
76
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
0.02
26.5
3.33
0.75
Typ
160
100
500
1.0
1.4
2.7
3.5
3.5
6.0
10
70
±5
48
80
40
10
26
9
−
1
−
3
−
6
Max
10.6
1.08
3.85
49.6
100
150
108
550
9.6
2.2
3.5
84
30
19
−
−
−
−
−
−
−
−
−
−
−
−
−
−
Unit
kHz
kHz
kHz
mA
mA
mA
kW
ms
kW
kW
mA
mA
ns
ns
ns
%
%
%
W
W
V
V
V
V
V
V
V
−