NCP1124, NCP1126, NCP1129

www.onsemi.com

6

Table 5. ELECTRICAL CHARACTERISTICS

Characteristics

Unit

Max

Typ

Min

Symbol

Conditions

FEEDBACK SECTION

Internal Pull−up Resistor

–

13

–

k

W

Equivalent ac resistor from FB to GND

–

15

–

k

W

Division Ratio

–

4

–

–

Feedback Voltage Below Which the

Peak Current is Frozen

0.85

1

1.15

V

FREQUENCY FOLDBACK

Frequency Foldback Level on the FB

47% of maximum peak current

1.35

1.5

1.78

V

Transition Frequency Below Which

Skip−Cycle occurs

22

26

30

kHz

Feedback voltage level when

Frequency Foldback ends

410

450

490

mV

Skip−Cycle Level Voltage on The FB pin

360

400

440

mV

Hysteresis on The Skip Comparator

–

40

–

mV

FAULT PROTECTION

Soft−Start Period

–

4.0

–

ms

Overload Fault Timer

35

50

65

ms

TEMPERATURE MANAGEMENT

Temperature Shutdown

(Note 9)

TSD

130

−

–

_C

Hysteresis

Guaranteed by Design

–

20

–

_C

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.

9. The value is not subjected to production test − verified by design/characterization. The thermal shutdown temperature refers to the junction

temperature of the controller.