NCP1341 datasheet(6/41 Pages) ONSEMI

Part #	NCP1341

Description	High-Voltage, Quasi-Resonant, Controller Featuring Valley Lock-Out Switching

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NCP1341

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Table 4. ELECTRICAL CHARACTERISTICS: (VCC = 12 V, VHV = 120 V, VFault = open, VFB = 2 V, VCS = 0 V, VZCD = 0 V, VFMAX =

0 V, CVCC = 100 nF , CDRV = 100 pF, for typical values TJ = 25°C, for min/max values, TJ is – 40°C to 125°C, unless otherwise noted)

Characteristics

Unit

Max

Typ

Min

Symbol

Conditions

FEEDBACK

Valley Thresholds

Transition from 1st to 2nd valley

Transition from 2nd to 3rd valley

Transition from 3rd to 4th valley

Transition from 4th to 5th valley

Transition from 5th to 6th valley

Transition from 6th to 5th valley

Transition from 5th to 4th valley

Transition from 4th to 3rd valley

Transition from 3rd to 2nd valley

Transition from 2nd to 1st valley

VFB decreasing

VFB increasing

V1to2

V2to3

V3to4

V4to5

V5to6

V6to5

V5to4

V4to3

V3to2

V2to1

0.987

0.846

0.776

0.705

0.635

1.199

1.269

1.340

1.410

1.551

1.050

0.900

0.825

0.750

0.675

1.275

1.350

1.425

1.500

1.650

1.113

0.954

0.874

0.795

0.715

1.352

1.431

1.511

1.590

1.749

V

Maximum Frequency Clamp

Versions A2/B2/C2/D2/E2/F2

Versions A3/B3/C3/D3/E3/F3

VFMAX = 0.7 V

VFMAX = 3.5 V

fMAX1

fMAX2

fMAX3

100

300

60

110

360

75

120

420

85

kHz

FMAX Secondary Mode Threshold

VFMAX(mode)

3.85

4.00

4.15

V

FMAX Pin Source Current

IFMAX

9.0

10

11

mA

Maximum On Time

ton(MAX)

28

32

40

ms

DEMAGNETIZATION INPUT

ZCD threshold voltage

VZCD decreasing

VZCD(trig)

35

60

90

mV

ZCD hysteresis

VZCD increasing

VZCD(HYS)

15

25

55

mV

Demagnetization Propagation Delay

VZCD step from 4.0 V to −0.3 V

tdemag

–

80

250

ns

ZCD Clamp Voltage

Positive Clamp

Negative Clamp

IQZCD = 5.0 mA

IQZCD = −2.0 mA

VZCD(MAX)

VZCD(MIN)

12.4

−0.9

12.7

−0.7

13

0

V

Blanking Delay After Turn−Off

tZCD(blank)

2.7

3.0

3.5

ms

Timeout After Last Demagnetization

Detection

While in soft−start

After soft−start complete

t(tout1)

t(tout2)

80

5.1

100

6.0

120

6.9

ms

CURRENT SENSE

Current Limit Threshold Voltage

Version C/D

Version A/B/E/F

VCS increasing

VILIM1

0.76

0.95

0.80

1.00

0.84

1.05

V

Leading Edge Blanking Duration

DRV minimum width minus

tdelay(ILIM1)

tLEB1

220

265

330

ns

Current Limit Threshold Propagation Delay

Step VCS 0 V to VILIM1 + 0.5 V,

VFB = 4 V

tdelay(ILIM1)

–

95

175

ns

PWM Comparator Propagation Delay

Step VCS 0 V to 0.7 V, VFB = 2 V

tdelay(PWM)

–

125

175

ns

Minimum Peak Current Freeze Setpoint

Vfreeze

170

200

230

mV

Abnormal Overcurrent Fault Threshold

Version C/D

Version A/B/E/F

VCS increasing, VFB = 4 V

VILIM2

1.125

1.400

1.200

1.500

1.275

1.600

V

Abnormal Overcurrent Fault Blanking

Duration

DRV minimum width minus

tdelay(ILIM2)

tLEB2

80

110

140

ns

Abnormal Overcurrent Fault Propagation

Delay

Step VCS 0 V to VILIM2 + 0.5 V,

VFB = 4 V

tdelay(ILIM2)

–

80

175

ns

Number of Consecutive Abnormal Overcur-

rent Faults to Enter Latch Mode

nILIM2

–

4

–

Overpower Protection Delay

VCS dv/dt = 1 V/ms, measured from

VOPP(MAX) to DRV falling edge

tOPP(delay)

–

95

175

ns

Overpower Signal Blanking Delay

tOPP(blank)

220

280

330

ns

Pull−Up Current Source

VCS = 1.5 V

ICS

0.7

1.0

1.5

mA

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