NCP1246

www.onsemi.com

7

Characteristics

Unit

Max

Typ

Min

Symbol

Test Condition

FEEDBACK

4.7

5

5.3

−

Internal pull−up voltage on the FB pin

(Note 6)

4.5

5

5.5

V

Feedback voltage below which the peak

current is frozen

1.35

1.5

1.65

V

SKIP CYCLE MODE

Feedback voltage thresholds for skip mode

0.63

0.72

0.70

0.80

0.77

0.88

V

REMOTE CONTROL ON FB PIN

The voltage above which the part enters the

on mode

−

2.2

−

V

The voltage below which the part enters the

off mode

0.35

0.40

0.45

V

500

−

−

mV

Pull−up current in off mode

−

5

−

mA

Go To Off mode timer

100

150

300

ms

OVERLOAD PROTECTION

Fault timer duration

108

128

178

ms

Autorecovery mode latch−off time duration

0.85

1.00

1.35

s

OVERPOWER PROTECTION

−

0.54

−

mA / V

Current flowing out of CS pin (Note 7)

−

−

−

105

0

20

110

130

−

−

−

150

mA

2.12

2.35

2.58

V

−

2.15

−

V

LATCH−OFF INPUT

High threshold

2.35

2.5

2.65

V

Low threshold

0.76

0.8

0.84

V

Current source for direct NTC connection

During normal operation

During soft−start

65

130

95

190

105

210

mA

Blanking duration on high latch detection

65 kHz version

100 kHz version

35

20

50

35

70

50

ms

Blanking duration on low latch detection

−

350

−

ms

Clamping voltage

1.0

1.8

1.2

2.4

1.4

3.0

V

TEMPERATURE SHUTDOWN

Temperature shutdown

−

150

−

°C

Temperature shutdown hysteresis

−

30

−

°C

5. Internal supply current only, currents sourced via FB pin is not included (current is flowing in GND pin only).

6. Guaranteed by design.

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.