NCP1256BSN65T1G datasheet(6/24 Pages) ONSEMI

Part #	NCP1256BSN65T1G

Description	Low Power Offline PWM Current Mode Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1256

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Table 4. 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

INTERNAL OSCILLATOR

fOSC,nom

Oscillation Frequency

65 kHz version

100 kHz version

−

61

93

65

100

70

107

kHz

Dmax

Maximum duty ratio

−

77

80

83

%

fjitter

Frequency jittering in percentage of fOSC

−

±5

%

fswing

Swing frequency over the whole frequency range

−

240

Hz

FEEDBACK SECTION

Rup

Internal pull−up resistor

2

30

k

W

Req

Equivalent ac resistance from FB to gnd

2

19

23

26

k

W

Iratio

Pin 2 to current setpoint division ratio

−

3

VfreezeF

Feedback voltage below which the peak current is frozen

2

0.75

V

FREQUENCY FOLDBACK

VfoldF

Frequency foldback level on the feedback pin –

≈63% of maximum

peak current

−

1.5

V

Ftrans

Minimum operating frequency

−

22

26

30

kHz

Vfold,end

End of frequency foldback feedback level, Fsw = Ftrans

1.2

V

Vskip

Skip−cycle level voltage on the feedback pin

−

0.6

V

Skip

hysteresis

Hysteresis on the skip comparator (Note 3)

−

45

mV

INTERNAL SLOPE COMPENSATION

S65

Compensation ramp slope, Fsw = 65 kHz

30

mV/

ms

S100

Compensation ramp slope, Fsw = 100 kHz

50

mV/

ms

PROTECTIONS

Vlatch1

Latching level input, brown−out input

3

4.3

4.5

4.7

V

Vlatch2

Latching level, current sense input, off time only

4

1.45

1.5

1.55

V

Tlatch−count

Number of clock cycles before latch confirmation from pin 3&4

−

4

Tlatch−del

OVP detection time constant

−

1

ms

Timer

Internal auto−recovery fault timer duration

−

50

70

90

ms

VOVP

Latched over voltage protection on the Vcc rail

6

25.3

26

26.8

V

TOVP−del

Delay before OVP confirmation on Vcc

6

25

ms

IBO

Brown−Out input bias current, VBO < DZBO

3

0.02

mA

VBOon

Turn−on voltage

3

0.76

0.8

0.87

V

VBOoff

Turn−off voltage

3

0.66

0.7

0.74

V

TBO

De−bouncing filter on BO comparator

3

50

ms

RdBO

Dynamic Zener diode resistance (all versions except E)

3

1

k

W

DZBO

Active Zener diode clamping BO signal (all versions except E)

3

3.1

3.3

3.5

V

1. For information only, collected on a typical 45−W adapter.

2. Guaranteed by design

3. Not tested in production.

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