NCP1072 datasheet(5/28 Pages) ONSEMI

Part #	NCP1072

Description	High-Voltage Switcher for Low Power Offline SMPS

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1070, NCP1071, NCP1072, NCP1075, NCP1076, NCP1077

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5

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

POWER SWITCH CIRCUIT

RDS(on)

Power Switch Circuit on−state resistance (Id = 50 mA)

NCP1070/71

TJ = 25°C

TJ = 125°C

NCP1072/75

TJ = 25°C

TJ = 125°C

NCP1076/77

TJ = 25°C

TJ = 125°C

5

−

22

38

11

19

4.7

8.7

32

55

16

24

6.9

10.75

W

BVDSS

Power Switch Circuit & Startup breakdown voltage

(ID(off) = 120 mA, TJ = 25°C)

5

700

V

IDSS(off)

Power Switch & Startup breakdown voltage off−state leakage current

TJ = 125°C (Vds = 700 V)

5

85

mA

ton

toff

Switching characteristics (RL=50 W, VDS set for Idrain = 0.7 x Ilim)

Turn−on time (90% − 10%)

Turn−off time (10% − 90%)

5

20

10

ns

INTERNAL START−UP CURRENT SOURCE

Istart1

High−voltage current source, V = VCC(on) − 200 mV

NCP1070/71/76/77

NCP1072/75

5

5.2

5

9.2

9

12.2

12

mA

Istart2

High−voltage current source, VCC = 0 V

5

0.5

mA

VCCTH

VCC Transient level for Istart1 to Istart2 toggling point

1

−

2.2

−

V

CURRENT COMPARATOR

IIPK

Maximum internal current setpoint at 50% duty cycle

FB pin open, Tj = 25°C

NCP1070

NCP1071

NCP1072

NCP1075

NCP1076

NCP1077

−

250

350

250

450

650

800

−

mA

IIPK(0)

Maximum internal current setpoint at beginning of switching cycle

FB pin open, Tj = 25°C

NCP1070

NCP1071

NCP1072

NCP1075

NCP1076

NCP1077

273

382

254

467

689

846

304

425

282

508

765

940

334

467

310

549

841

1034

mA

IIPKSW

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

FSW =65 kHz (Note 3)

NCP1070

NCP1071

NCP1072

NCP1075

NCP1076

NCP1077

−

314

427

296

510

732

881

−

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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