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NCP1028 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. NCP1028
Description  High−Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1028 Datasheet(HTML) 5 Page - ON Semiconductor

 
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NCP1028
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ELECTRICAL CHARACTERISTICS (continued) (For typical values TJ = 25°C, for min/max values TJ = 0°C to +125°C,
Max TJ = 150°C, VCC = 8.0 V, unless otherwise noted.)
Characteristic
Pin
Symbol
Min
Typ
Max
Unit
CURRENT COMPARATOR
Maximum Internal Current Setpoint, Pin 4 Open, TJ = 25°C,
FSW = 65 kHz (Note 3)
Ipeak_27_CS_
65 k
720
800
880
mA
Final Switch Current with a Primary Slope of 200 mA/ms,
FSW = 65 kHz (Note 4)
Ipeak_27_SW_
65 k
820
mA
Maximum Internal Current Setpoint, Pin 4 Open, TJ = 25°C,
FSW = 100 kHz (Note 3)
Ipeak_27_CS_
100 k
720
800
880
mA
Final Switch Current with a Primary Slope of 200 mA/ms,
FSW = 100 kHz (Note 4)
Ipeak_27_SW_
100 k
820
mA
Setpoint Decrease for a Pin 7 Injected Current of 40 mA, TJ = 25°C
7
IOPP
23
%
Voltage Level in Pin 7 at which OPP Starts to Operate
7
IOPPtripV
1.5
V
Soft−Start Duration
TSS
1.0
ms
Propagation Delay from Current Detection to Drain OFF State
Tprop
100
ns
Leading Edge Blanking Duration
TLEB
200
ns
INTERNAL OSCILLATOR
Oscillation Frequency (Note 5)
65 kHz Version, TJ = 25°C
fOSC
58.5
65
71.5
kHz
Oscillation Frequency (Note 5)
100 kHz Version, TJ = 25°C
fOSC
90
100
110
kHz
Frequency Jittering in Percentage of fOSC
fJitter
"6.0
%
Jittering Swing Frequency
fswing
300
Hz
Maximum Duty Cycle
Dmax
74
80
87
%
FEEDBACK SECTION
Internal Pullup Resistor
4
Rupp
16
kW
Ramp Compensation Level on Pin 1 – Rramp = 100 kW
2
Rlevel
2.75
V
SKIP CYCLE GENERATION
Internal Skip Mode Level, in Percentage of Maximum Peak Current
Iskip
25
%
PROTECTIONS
Brown−Out Level
3
VBO
510
570
620
mV
Brown−Out Hysteresis Current, TJ = 25°C (Note 3)
3
IBOhyste
10
11.5
13
mA
Brown−Out Hysteresis Current, TJ = 0°C to 125°C
3
IBOhyste
10
mA
Fault Validation further to Error Flag Assertion
TimerON
40
55
ms
OFF Phase in Fault Mode
TimerOFF
440
ms
Latching Voltage on Brown−Out Pin
3
Vlatch
3.15
3.5
3.85
V
Latch Input Integrating Filter Time Constant
3
TdelBOL
20
ms
TEMPERATURE MANAGEMENT
Temperature Shutdown
TSD
160
°C
Hysteresis in Shutdown
40
°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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