NCP1237 datasheet(5/34 Pages) ONSEMI

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NCP1237

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ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, VHV = 120 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)

−

Current flowing out of VCC pin @ VHV = 60 V

VCC = 0 V

VCC = VCC(on) − 0.5 V

Istart1

Istart2

0.2

0.5

0.8

Off−state leakage current

VHV = 500 V

Istart(off)

−

SUPPLY

Turn−on threshold level, VCC going up

HV current source stop threshold

VCC(on)

11.0

12.0

13.0

HV current source restart threshold

VCC(min)

9.5

10.5

11.5

Turn−off threshold level

VCC(off)

8.5

9.5

10.5

Blanking duration on VCC(min) and VCC(off) detection

Guaranteed by design

tUVLO(blank)

VCC decreasing level at which the internal logic resets

VCC(reset)

4.0

5.2

6.5

VCC level for ISTART1 to ISTART2 transition

VCC(inhibit)

0.4

0.65

0.9

Internal current consumption (Note 6)

DRV open, VFB = 3 V

Cdrv = 1 nF, VFB = 3 V

Off mode (skip or before

startup)

Fault mode (fault or latch)

ICC1

ICC2

ICC3

ICC4

2.0

2.3

0.9

0.4

2.5

3.3

1.2

0.7

3.0

4.3

1.5

1.0

BROWN−OUT AND LINE OVERVOLTAGE

Brown−out threshold voltage

VHV going up

VHV going down

VHV(start)

VHV(stop)

104

112

105

120

113

Timer duration for line cycle drop−out

tHV

Overvoltage threshold

VHV going up

VHV going down

VHV(OV1)

VHV(OV2)

400

395

430

425

460

455

Blanking duration on line overvoltage detection

tOV(blank)

−

250

−

OSCILLATOR

Oscillator frequency

fOSC

kHz

Maximum duty ratio

DMAX

Frequency jittering amplitude, in percentage of FOSC

Guaranteed by design

Ajitter

Frequency jittering modulation frequency

Guaranteed by design

Fjitter

125

165

OUTPUT DRIVER

Rise time, 10% to 90% of VCC

VCC = VCC(min) + 0.2 V,

CDRV = 1 nF

trise

−

Fall time, 90% to 10% of VCC

VCC = VCC(min) + 0.2 V,

CDRV = 1 nF

tfall

−

Current capability

VCC = VCC(min) + 0.2 V,

CDRV = 1 nF

DRV high, VDRV = 0 V

DRV low, VDRV = VCC

IDRV(source)

IDRV(sink)

−

1000

−

Clamping voltage (maximum gate voltage)

VCC = VCCmax – 0.2 V, DRV

high

VDRV(clamp)

13.5

High−state voltage drop

VCC = VCC(min) + 0.2 V,

RDRV = 33 kW, DRV high

VDRV(drop)

−

6. Internal supply current only, current in FB pin not included (current flowing through GND pin only).

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