NCP1246A65DR2G datasheet(5/38 Pages) ONSEMI

Part #	NCP1246A65DR2G

Description	Fixed Frequency Current Mode Controller for Flyback Converters

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NCP1246

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ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = ï40°C to +125°C, VHV = 125 V,

VCC = 11 V unless otherwise noted)

Characteristics

Test Condition

Symbol

Min

Typ

Max

Unit

HIGH VOLTAGE CURRENT SOURCE

Minimum voltage for current source

operation

VHV(min)

ï

30

40

V

Current flowing out of VCC pin

VCC = 0 V

VCC = VCC(on) ï 0.5 V

Istart1

Istart2

0.2

5

0.5

8

0.8

11

mA

Offïstate leakage current

VHV = 500 V, VCC = 15 V

Istart(off)

10

25

50

mA

Offïmode HV supply current

VHV = 141 V,

VHV = 325 V,

VCC loaded by 4.7 mF cap

IHV(off)

ï

45

50

60

70

mA

SUPPLY

HV current source regulation threshold

VCC(reg)

8

11

ï

V

Turnïon threshold level, VCC going up

HV current source stop threshold

VCC(on)

11.0

12.0

13.0

V

HV current source restart threshold

VCC(min)

9.5

10.5

11.5

V

Turnïoff threshold

VCC(off)

8.5

8.9

9.3

V

Overvoltage threshold

VCC(ovp)

25

26.5

28

V

Blanking duration on VCC(off) and VCC(ovp)

detection

tVCC(blank)

7

10

13

ms

VCC decreasing level at which the internal

logic resets

VCC(reset)

4.8

7.0

7.7

V

VCC level for ISTART1 to ISTART2 transition

VCC(inhibit)

0.2

0.8

1.25

V

Internal current consumption (Note 6)

DRV open, VFB = 3 V, 65 kHz

DRV open, VFB = 3 V, 100 kHz

Cdrv = 1 nF, VFB = 3 V, 65 kHz

Cdrv = 1 nF, VFB = 3 V, 100 kHz

Off mode (skip or before startïup)

Fault mode (fault or latch)

ICC1

ICC2

ICC3

ICC4

1.3

1.8

2.3

0.67

0.3

1.85

2.6

2.9

0.9

0.6

2.2

3.0

3.5

1.13

0.9

mA

BROWNïOUT

BrownïOut thresholds

VHV going up

VHV going down

VHV(start)

VHV(stop)

102

94

111

103

120

112

V

Timer duration for line cycle dropïout

tHV

43

ï

86

ms

X2 DISCHARGE

Comparator hysteresis observed at HV pin

VHV(hyst)

1.5

3.5

5

V

HV signal sampling period

Tsample

ï

1.0

ï

ms

Timer duration for no line detection

tDET

21

32

43

ms

Discharge timer duration

tDIS

21

32

43

ms

OSCILLATOR

Oscillator frequency

fOSC

58

87

65

100

72

109

kHz

Maximum on time for TJ = 25°C to +125°C

only

fOSC = 65 kHz

fOSC = 100 kHz

tONmax(65kHz)

tONmax(100kHz)

11.5

7.5

12.3

8.0

13.1

8.5

ms

Maximum on time

fOSC = 65 kHz

fOSC = 100 kHz

tONmax(65kHz)

tONmax(100kHz)

11.3

7.4

12.3

8.0

13.1

8.5

ms

6. Internal supply current only, currents sourced via FB pin is not included (current is flowing in GND pin only).

7. Guaranteed by design.

8. CS pin source current is a sum of Ibias and IOPC, thus at VHV = 125 V is observed the Ibias only, because IOPC is switched off.

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