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NCP1027
ELECTRICAL CHARACTERISTICS (continued) (For typical values T J = 25 ° C, for min/max values T J = 0 ° C to +125 ° C,
Max T J = 150 ° C, V CC = 8.0 V, unless otherwise noted.)
Characteristic
Pin
Symbol
Min
Typ
Max
Unit
CURRENT COMPARATOR
Maximum Internal Current Setpoint, Pin 4 Open, T J = 25 ° C,
-
Ipeak_27_CS_
720
800
880
mA
F SW = 65 kHz (Note 3)
65 k
Final Switch Current with a Primary Slope of 200 mA/ m s,
-
Ipeak_27_SW_
-
820
-
mA
F SW = 65 kHz (Note 4)
65 k
Maximum Internal Current Setpoint, Pin 4 Open, T J = 25 ° C,
-
Ipeak_27_CS_
720
800
880
mA
F SW = 100 kHz (Note 3)
100 k
Final Switch Current with a Primary Slope of 200 mA/ m s,
-
Ipeak_27_SW_
-
820
-
mA
F SW = 100 kHz (Note 4)
100 k
Setpoint Decrease for a Pin 7 Injected Current of 40 m A, T J = 25 ° C
Voltage Level in Pin 7 at which OPP Starts to Operate
Soft-Start Duration
Propagation Delay from Current Detection to Drain OFF State
Leading Edge Blanking Duration
7
7
-
-
-
IOPP
IOPPtripV
T SS
T prop
T LEB
-
-
-
-
-
23
1.5
1.0
100
200
-
-
-
-
-
%
V
ms
ns
ns
INTERNAL OSCILLATOR
Oscillation Frequency (Note 5)
65 kHz Version, T J = 25 ° C
Oscillation Frequency (Note 5)
100 kHz Version, T J = 25 ° C
Frequency Jittering in Percentage of f OSC
Jittering Swing Frequency
Maximum Duty Cycle
-
-
-
-
-
f OSC
f OSC
f Jitter
fswing
Dmax
58.5
90
-
-
74
65
100
" 6.0
300
80
71.5
110
-
-
87
kHz
kHz
%
Hz
%
FEEDBACK SECTION
Internal Pullup Resistor
Ramp Compensation Level on Pin 1 – Rramp = 100 k W
4
2
Rupp
Rlevel
-
-
16
2.75
-
-
k W
V
SKIP CYCLE GENERATION
Internal Skip Mode Level, in Percentage of Maximum Peak Current
-
Iskip
-
25
-
%
PROTECTIONS
Brown-Out Level
Brown-Out Hysteresis Current, T J = 25 ° C (Note 3)
Brown-Out Hysteresis Current, T J = 0 ° C to 125 ° C
Fault Validation further to Error Flag Assertion
OFF Phase in Fault Mode
Latching Voltage on Brown-Out Pin
Latch Input Integrating Filter Time Constant
OVP Integrating Filter Time Constant
V CC Current at which the Switcher Stops Pulsing
3
3
3
-
-
3
3
-
1
VBO
IBOhyste
IBOhyste
TimerON
TimerOFF
Vlatch
TdelBOL
TdelOVP
IOVP
510
10
-
40
-
3.15
-
-
6.0
570
11.5
10
55
440
3.5
20
50
8.5
620
13
-
-
-
3.85
-
-
11
mV
m A
m A
ms
ms
V
m s
m s
mA
TEMPERATURE MANAGEMENT
Temperature Shutdown
Hysteresis in Shutdown
-
-
TSD
-
160
-
-
40
-
-
° C
° C
3. See characterization curves for full temperature span evolution.
4. The final switch current is: Ipeak_2X_CS + Tprop x Vin / Lp, with Vin the input voltage and Lp the primary inductor in a flyback.
5. Oscillator frequency is measured with disabled jittering.
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