NCP1561 datasheet(11/22 Pages) ONSEMI

Part #	NCP1561

Description	Push-Pull PWM Controller for 48 V Telecom Systems

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NCP1561

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11

TYPICAL CHARACTERISTICS

TJ, JUNCTION TEMPERATURE (°C)

125

100

75

50

25

0

−25

−50

3.0

3.5

4.0

4.5

5.0

5.5

6.5

7.0

150

6.0

30

35

40

45

50

55

65

70

60

CHARGE

DISCHARGE

525

450

225

150

75

0

5

10

20

30

45

375

300

15

25

TJ = −40°C

TJ = 125°C

40

35

VEA = 3.0 V

DCMAX PIN = OPEN

TJ, JUNCTION TEMPERATURE (°C)

150

125

100

75

0

−25

−50

20

25

35

40

45

50

25

RP = OPEN, RMDP = OPEN

RP = 0 W, RMDP = OPEN

Vin = 36 V

RFF = 432 kW

Figure 22. Maximum Duty Cycle versus

Feedforward Current

Figure 23. Maximum Duty Cycle versus

Junction Temperature

Figure 24. Soft−Start Charge/Discharge

Currents versus Junction Temperature

IFF, FEEDFORWARD CURRENT (mA)

50

30

Figure 25. VEA Input Resistance versus

Junction Temperature

TJ, JUNCTION TEMPERATURE (°C)

150

100

50

0

−50

0

10

20

40

50

30

−25

125

75

25

TJ, JUNCTION TEMPERATURE (°C)

150

125

100

25

0

−25

−50

0.75

0.80

0.85

0.95

1.00

50

75

0.90

Figure 26. PWM Comparator Lower Input

Threshold versus Junction Temperature

TJ, JUNCTION TEMPERATURE (°C)

125

100

75

50

25

0

−25

−50

4.91

4.93

4.95

4.97

5.01

150

IREF = 0 mA

IREF = 6 mA

4.99

Figure 27. Reference Voltage versus Junction

Temperature

RFF = 432 kW

Vin = 48 V

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