NCP1239DD65R2G datasheet(6/25 Pages) ONSEMI

Part #	NCP1239DD65R2G

Description	Fixed Frequency Current?륪ode Controller for Flyback Converter

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1239

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Table 4. ELECTRICAL CHARACTERISTICS (continued)

(For typical values TJ = 25°C, for min/max Values TJ = −40°C to +125°C, VHV = 125 V, VCC = 11 V unless otherwise noted)

Parameter

Unit

Max

Typ

Min

Symbol

Test Conditions

INTERNAL OSCILLATOR

Oscillation Frequency

(65-kHz Version)

fOSC

60

65

70

kHz

Oscillation Frequency

(100-kHz Version)

fOSC

92

100

108

kHz

Maximum Duty-Cycle

DMAX

76

80

84

%

Frequency Jittering

In Percentage of fOSC – Jitter is

Kept even in Foldback Mode

fJITTER

−

±5

−

%

Swing Frequency

fSWING

−

240

−

Hz

FEEDBACK SECTION

Equivalent AC Resistor from FB to GND

(Note 1)

REQ

−

25

−

k

W

Internal Pull-Up Voltage on FB Pin

FB open

VFB(ref)

4.1

4.3

−

V

VFB to Current Setpoint Division Ratio

KFB

−

4

−

Feedback Voltage below which the Peak

Current is Frozen

VFREEZE

−

1.0

−

V

FREQUENCY FOLDBACK

Frequency Foldback Level on FB Pin

≈ 59% of Maximum Peak

Current

VFOLD

−

1.90

−

V

Transition Frequency below which Skip-Cycle

Occurs

VFB =VSKIP + 0.5 V

fTRANS

22

26

30

kHz

End of Frequency Foldback Feedback Level

fSW = fMIN

VFOLD(end)

−

1.50

−

V

Skip-Cycle Level Voltage on FB Pin

VSKIP

−

0.80

−

V

Hysteresis on the Skip Comparator

(Note 1)

VSKIP(hyst)

−

30

−

mV

INTERNAL RAMP COMPENSATION

Compensation Ramp Slope

FSW = 65 kHz, RUP = 30 kW

FSW = 100 kHz, RUP = 30 kW

S65

S100

−

−29

−45

−

mV/

ms

OVERPOWER COMPENSATION (OPP)

VHV to IOPP Conversion Ratio

KOPP

−

0.54

−

mA/V

Current Flowing Out of CS Pin

(Note 2)

VHV = 125 V

VHV = 162 V

VHV = 328 V

VHV = 365 V

IOPP(125)

IOPP(162)

IOPP(328)

IOPP(365)

−

105

0

20

110

130

−

150

mA

Percentage of Applied OPP Current

VFB < VFOLD

IOPP1

−

0

−

%

Percentage of Applied OPP Current

VFB > VFOLD + 0.7 V (VOPP)

IOPP2

−

100

−

%

Clamped OPP Current

VHV > 365 V

IOPP3

105

130

150

mA

Watchdog Timer for DC Operation

tWD(OPP)

−

32

−

ms

BROWN-OUT (BO)

Brown-Out Thresholds (A, B, C & E versions)

VHV Increasing

VBO(on)

100

110

120

V

Brown-Out Thresholds (A, B, C & E versions)

VHV Decreasing

VBO(off)

93

101

109

V

Brown-Out Thresholds (D version only)

VHV Increasing

VBO(on)

92

101

110

V

Brown-Out Thresholds (D version only)

VHV Decreasing

VBO(off)

87

95

103

V

Timer Duration

VHV Decreasing

tBO

54

68

82

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.

1. Guaranteed by design

2. CS pin source current is a sum of IBIAS and IOPP, thus at VHV = 125 V is observed the IBIAS only, because IOPC is switched off.

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