NCP1072 datasheet(6/28 Pages) ONSEMI

Part #	NCP1072

Description	High-Voltage Switcher for Low Power Offline SMPS

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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NCP1070, NCP1071, NCP1072, NCP1075, NCP1076, NCP1077

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6

ELECTRICAL CHARACTERISTICS

(For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, VCC = 8 V unless otherwise noted)

Symbol

Unit

Max

Typ

Min

Rating

CURRENT COMPARATOR

IIPKSW

Final switch current with a primary slope of 200 mA/ms,

FSW =100 kHz (Note 3)

NCP1070

NCP1071

NCP1072

NCP1075

NCP1076

NCP1077

−

309

415

293

500

706

845

−

mA

IIPKSW

Final switch current with a primary slope of 200 mA/ms,

FSW =130 kHz

NCP1070 (Note 4)

NCP1071 (Note 4)

NCP1072 (Note 4)

NCP1075

NCP1076 (Note 4)

NCP1077 (Note 4)

−

303

407

291

493

684

814

−

mA

TSS

Soft−start duration (guaranteed by design)

−

1

−

ms

Tprop

Propagation delay from current detection to drain OFF state

−

100

−

ns

INTERNAL OSCILLATOR

fOSC

Oscillation frequency, 65 kHz version, Tj = 25°C (Note 5)

−

59

65

71

kHz

fOSC

Oscillation frequency, 100 kHz version, Tj = 25°C (Note 5)

−

90

100

110

kHz

fOSC

Oscillation frequency, 130 kHz version, Tj = 25°C (Note 4 et 5)

−

117

130

143

kHz

fjitter

Frequency jittering in percentage of fOSC

−

±6

−

%

fswing

Jittering swing frequency

−

300

−

Hz

Dmax

Maximum duty−cycle

NCP1070/71/72/75

NCP1076/77

−

62

65

68

69

72

73

%

FEEDBACK SECTION

IFBfault

FB current for which Fault is detected

4

−35

mA

IFB100%

FB current for which internal current set−point is 100% (IIPK(0))

4

−44

mA

IFBFreeze

FB current for which internal current set−point is IFreeze

4

−

−90

−

mA

VFB(REF)

Equivalent pull−up voltage in linear regulation range

(Guaranteed by design)

4

3.3

V

RFB(up)

Equivalent feedback resistor in linear regulation range

(Guaranteed by design)

4

19.5

kW

FREQUENCY FOLDBACK & SKIP

IFBfold

Start of frequency foldback feedback level

4

−

−68

−

mA

IFBfold(end)

End of frequency foldback feedback level, Fsw = Fmin

4

−

−100

−

mA

Fmin

The frequency below which skip−cycle occurs

−

21

25

29

kHz

IFBskip

The feedback level to enter skip mode

4

−

−120

−

mA

IFreeze

Internal minimum current setpoint (IFB = IFBFreeze)

NCP1070

NCP1071

NCP1072

NCP1075

NCP1076

NCP1077

−

88

123

88

168

228

280

−

mA

3. The final switch current is: IIPK(0) / (Vin/LP + Sa) x Vin/LP + Vin/LP x tprop, with Sa the built−in slope compensation, Vin the input voltage, LP

the primary inductor in a flyback, and tprop the propagation delay.

4. NCP1070/71/72/76/77 130 kHz on demand only.

5. Oscillator frequency is measured with disabled jittering.

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