NCP1253_14 datasheet(5/15 Pages) ONSEMI

Part #	NCP1253

Description	Current-Mode PWM Controller for Off-line Power Supplie

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1253

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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

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

k

W

Req

Equivalent ac resistor from FB to GND

2

16

k

W

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

k

W

4. A 1 M

W 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

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.

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