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NCP1282

High Performance Active Clamp/Reset PWM Controller Featuring 500 V Startup

ON Semiconductor 

NCP1282

ELECTRICAL CHARACTERISTICS (Vin = 48 V, VAUX = 12 V, VUVOV = 2.3 V, VEA = open, VCSKIP = 0 V, VCS = 0 V, VSS = open,

RT = 13.3 kW, CAUX = 10 mF, CT = 470 pF, Cout1 = Cout2 = 100 pF, CUVOV = 0.01 mF, CCSKIP = 6800 pF, RD = 25 kW, RSYNC = 5.0 kW,

CREF = 0.1 mF, RFF = 29.4 kW, CFF = 470 pF. For typical values TJ = 25°C, for min/max values, TJ is – 40°C to 125°C, unless otherwise noted.)

Characteristic

Symbol

Min

Typ

Max

Unit

STARTUP CONTROL AND VAUX REGULATOR

VAUX Regulation (VUVOV = 0 V)

Inhibit Threshold Voltage

Startup Threshold/VAUX Regulation Peak (VAUX Increasing)

Operating VAUX Valley Voltage

Minimum Operating VAUX Valley Voltage after Turn−On

(VUVOV = 2.3 V, VEA = 0 V)

V

Vinhibit

VAUX(on)

VAUX(off1)

VAUX(off2)

–

1.15

10.6

11.1

8.9

9.4

8.0

8.4

1.6

11.6

9.9

9.0

Minimum Startup Voltage (Pin 1)

IAUX = 1.0 mA, VAUX = VAUX(on) – 0.2 V

Inhibit Bias Current

VAUX = 0 V

Vstart(min)

–

V

–

23.2

Iinhibit

mA

70

171

270

Startup Circuit Output Current

VAUX = Vinhibit + 0.2 V

VAUX = VAUX(on) – 0.2 V

Startup Circuit Off−State Leakage Current (Vin = 500 V, VUVOV = 0 V)

TJ = 25°C

TJ = –40°C to 125°C

Istart1

Istart2

Istart(off)

7.16

9.3

4.03

6.1

–

25

–

–

mA

11.3

8.1

mA

50

100

Startup Circuit Breakdown Voltage (Note 3)

Istart(off) = 50 mA, TJ = 125°C

VBR(DS)

V

500

–

–

Auxiliary Supply Current after VAUX Turn−On

Outputs Disabled

VUVOV = 0 V

VEA = 0 V

Outputs Enabled

VEA = 4.0 V

IAUX1

IAUX2

IAUX3

mA

–

3.1

3.6

–

4.3

4.94

–

4.9

7.0

LINE UNDER/OVERVOLTAGE DETECTOR

Undervoltage Threshold (Vin Increasing)

Undervoltage Hysteresis

Undervoltage Ratio (VUV(H)/VUV)

Overvoltage Threshold (Vin Increasing)

Overvoltage Hysteresis

Offset Current (VUVOV = 2.8 V)

Offset Current Turn ON Threshold ("5%, Ioffset(UVOV) = 40 mA)

LINE FEEDFORWARD

VUV

1.979

2.05

2.116

V

VUV(H)

0.074

0.093

0.118

V

VUV(ratio)

3.65

4.5

5.62

%

VOV

2.80

2.95

3.10

V

VOV(H)

0.075

0.093

0.127

V

Ioffset(UVOV)

38

48

58

mA

Voffset(UVOV)

2.4

2.6

2.8

V

Peak Voltage (Volt−Second Clamp)

Discharge Current (VFF = 0.5 V, VSS = 0 V)

Offset Voltage (VFF = 0 V, Ramp Down VSS)

Feedforward Offset Minus Soft−Stop Reset Voltage

3. Guaranteed by design only.

VFF(peak)

2.8

3.0

3.2

V

IFF(D)

8.5

–

–

mA

Voffset(FF)

0.118

0.185

0.268

V

D(FF−SS)

7

70

183

mV

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