NCP1234 datasheet(11/33 Pages) ONSEMI

Part #	NCP1234

Description	Fixed Frequency Current Mode Controller for Flyback Converters

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1234

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11

TYPICAL PERFORMANCE CHARACTERISTICS

2.35

2.40

2.45

2.50

2.55

2.60

2.65

−50

−25

0

25

50

75

100

125

TEMPERATURE (C)

Figure 21. Latch Pin High Threshold VOVP

0.75

0.76

0.77

0.78

0.79

0.80

0.81

0.82

0.83

0.84

0.85

−50

−25

0

25

50

75

100

125

TEMPERATURE (C)

Figure 22. Latch Pin Low Threshold VOTP

1.18

1.20

1.22

1.24

1.26

1.28

1.30

1.32

1.34

−50

−25

0

25

50

75

100

125

TEMPERATURE (C)

Figure 23. Latch Pin Open Voltage Vclamp0

2.00

2.10

2.20

2.30

2.40

2.50

2.60

2.70

2.80

−50

−25

0

25

50

75

100

125

TEMPERATURE (C)

Figure 24. Latch Pin Voltage Vclamp1 (Latch−off

Pin is Sinking 1 mA)

70

75

80

85

90

95

100

105

110

−50

−25

0

25

50

75

100

125

TEMPERATURE (C)

Figure 25. Current INTC Sourced from the

Latch Pin, Allowing Direct NTC Connection

140

150

160

170

180

190

200

210

220

−50

−25

0

25

50

75

100

125

TEMPERATURE (C)

Figure 26. Current INTC(SSTART) Sourced from

the Latch Pin, During Soft−Start

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NCP1234 Datasheet(PDF) 11 Page - ON Semiconductor

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