NCP1561DR2 datasheet(9/22 Pages) ONSEMI

Part #	NCP1561DR2

Description	Push-Pull PWM Controller for 48 V Telecom Systems

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1561

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9

TYPICAL CHARACTERISTICS

Figure 10. Operating Auxiliary Supply Current

versus Junction Temperature

Figure 11. Line Undervoltage Threshold

versus Junction Temperature

TJ, JUNCTION TEMPERATURE (°C)

125

100

75

50

25

0

−25

−50

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

125

100

75

50

25

0

−25

−50

1.30

1.35

1.40

1.45

1.50

1.70

Figure 12. Line Undervoltage Hysteresis versus

Junction Temperature

TJ, JUNCTION TEMPERATURE (°C)

150

125

100

25

0

−25

−50

70

80

90

100

110

120

140

Figure 13. Current Limit Thresholds versus

Junction Temperature

TJ, JUNCTION TEMPERATURE (°C)

125

100

75

50

25

0

−25

−50

0.90

0.95

1.00

1.05

1.10

1.15

1.25

1.30

150

1.55

1.60

1.65

130

150

1.20

75

50

fOSC = 250 kHz

CYCLE SKIP

CYCLE BY CYCLE

VAUX = 12 V

DC

[ 50%

fOSC = 150 kHz

fOSC = 100 kHz

Figure 14. Current Limit Propagation Delay

versus Junction Temperature

TJ, JUNCTION TEMPERATURE (°C)

125

100

75

50

25

0

−25

−50

70

75

80

85

90

95

115

120

150

100

105

110

VAUX = 12 V

Measured from VOH to 0.5 VOH

Figure 15. Oscillator Frequency versus

Junction Temperature

TJ, JUNCTION TEMPERATURE (°C)

125

100

75

50

25

0

−25

−50

75

100

125

150

175

200

300

150

225

250

275

RT = 148 kW

RT = 101 kW

RT = 50.6 kW

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