NCP1083 datasheet(10/17 Pages) ONSEMI

Part #	NCP1083

Description	Integrated High Power PoE-PD Interface & DC-DC Converter Controller with 9V Auxiliary Supply Support

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NCP1083

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10

Table 3. Operating Conditions

Symbol

Parameter

Min.

Typ.

Max.

Units

Conditions

SOFT−START

Vss

Soft−start voltage range

−

1.15

−

V

Vss_r

Soft−start low threshold (rising edge)

0.35

0.45

0.55

V

Iss

Soft−start source current

3

5

7

mA

CURRENT LIMIT COMPARATOR

CSth

CS threshold voltage

324

360

396

mV

Tblank

Blanking time

−

100

−

nS

For information only

OSCILLATOR

DutyC

Maximum duty cycle

−

80%

−

Fixed internally

Frange

Oscillator frequency range

100

−

500

kHz

F_acc

Oscillator frequency accuracy

±25

%

CURRENT CONSUMPTION

IvportP1

VPORTP internal current consumption

(Note 14)

−

2.5

3.5

mA

DC−DC controller off

IvportP2

VPORTP internal current consumption

(Note 15)

−

4.7

6.5

mA

DC−DC controller on

THERMAL SHUTDOWN

TSD

Thermal shutdown threshold

150

−

°C Tj

Tj = junction temperature

Thyst

Thermal hysteresis

−

15

−

°C Tj

Tj = junction temperature

THERMAL RATINGS

Ta

Ambient temperature

−40

−

85

°C

Tj

Junction temperature

−

125

150

°C

Parametric values guaranteed

− Max 1000 hours

14.Conditions

a. No current through the pass−switch

b. DC−DC controller inactive (SS shorted to RTN)

c. No external load on VDDH and VDDL

d. VPORTP = 57 V

15.Conditions

a. No current through the pass−switch

b. Oscillator frequency = 100 kHz

c. No external load on VDDH and VDDL

d. Aux winding not used

e. 2 nF on GATE, DC−DC controller enabled

f. VPORTP = 57 V

Figure 6. (Ivddl_load)max with Auxiliary

Supply Operation

Figure 7. (Ivddh_load+Ivddl_load)max with

Auxiliary Supply Operation

VPORTP−ARTN VOLTAGE DURING PWM

OPERATION (V)

VPORTP−ARTN VOLTAGE DURING PWM

OPERATION (V)

13

12

11.5

11

10.5

10

9.0

8.5

4.0

4.5

5.0

6.5

7.5

8.5

9.5

10.5

0.50

0.75

1.00

1.25

1.75

2.00

2.25

2.50

9.5

12.5

13.5

5.5

6.0

7.0

8.0

9.0

10.0

13

12

11.5

11

10.5

10

9.0

8.5

9.5

12.5

13.5

1.50

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