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NCP1253 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. NCP1253
Description  Current-Mode PWM Current-Mode PWM Power Supplies
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1253 Datasheet(HTML) 5 Page - ON Semiconductor

 
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NCP1253
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS
(For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, Max TJ = 150°C, VCC = 12 V unless otherwise noted)
Symbol
Unit
Max
Typ
Min
Pin
Rating
CURRENT COMPARATOR
Vfold
Default internal voltage set point for frequency foldback trip point – 45% of
Vlimit
4
357
mV
Vfreeze
Internal peak current setpoint freeze (≈31% of Vlimit)
4
250
mV
TDEL
Propagation delay from current detection to gate off−state
4
100
150
ns
TLEB
Leading Edge Blanking Duration
4
300
ns
TSS
Internal soft−start duration activated upon startup, auto−recovery
4
ms
INTERNAL OSCILLATOR
fOSC
Oscillation frequency (65 kHz version)
61
65
71
kHz
fOSC
Oscillation frequency (100 kHz version)
92
100
108
kHz
Dmax
Maximum duty−ratio
76
80
84
%
fjitter
Frequency jittering in percentage of fOSC
±5
%
fswing
Swing frequency
240
Hz
Feedback Section
Rup
Internal pull−up resistor
2
20
kW
Req
Equivalent ac resistor from FB to GND
2
16
kW
Iratio
Pin 2 to current setpoint division ratio
4.2
Vfreeze(FB) Feedback voltage below which the peak current is frozen
2
1.05
V
FREQUENCY FOLDBACK
Vfold
Frequency foldback level on the feedback pin – ≈45% of maximum peak
current
1.5
V
Ftrans
Transition frequency below which skip−cycle occurs
22
26
30
kHz
Vfold,end
End of frequency foldback feedback level, Fsw = Fmin
350
mV
Vskip
Skip−cycle level voltage on the feedback pin
300
mV
Skip
hysteresis
Hysteresis on the skip comparator
30
mV
INTERNAL SLOPE COMPENSATION
Vramp
Internal ramp level @ 25°C (Note 4)
4
2.5
V
Rramp
Internal ramp resistance to CS pin
4
20
kW
4. A 1 MW resistor is connected from pin 4 to the ground for the measurement.
PROTECTIONS
VOVP
Latched Overvoltage Protection on the VCC rail
5
24
25.5
27
V
TOVPdel
Delay before OVP confirmation on the VCC rail
5
20
ms
Timer
Internal auto−recovery fault timer duration
100
130
160
ms


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