NCP1937A3DR2G datasheet(11/38 Pages) ONSEMI

Part #	NCP1937A3DR2G

Description	Combination Power Factor Correction and Quasi-Resonant Flyback Controllers for Adapters

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NCP1937

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Table 4. ELECTRICAL CHARACTERISTICS: (VCC = 12 V, VBO/X2 = 120 V, VHV/X2 = 120 V, VFault = open, VRPFBHV = 20 V,

VPFBLV = 2.4 V, VPControl = 4 V, VPCS/PZCD = 0 V, VQFB = 3 V, VPONOFF = 4 V, VQCS = 0 V, VQZCD = 0 V, VPSTimer = 0 V, RPFBHV = 200 kW,

CVCC = 100 nF , CQCT = 220 pF, CPDRV = 1 nF, CQDRV = 1 nF, 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

QR FLYBACK GATE DRIVE

Rise Time (10−90%)

VQDRV from 10 to 90%

14

tQDRV(rise)

–

40

80

ns

Fall Time (90−10%)

90 to 10% of VQDRV

14

tQDRV(fall)

–

20

40

ns

Driver Resistance

Source

Sink

14

RQDRV(SRC)

RQDRV(SNK)

13

7

W

Current Capability

Source

Sink

VQDRV = 2 V

VQDRV = 10 V

14

IQDRV(SRC)

IQDRV(SNK)

–

500

800

–

mA

High State Voltage

VCC = VCC(off) + 0.2 V,

RQDRV = 10 kW

VCC = 26 V,

RQDRV = 10 kW

14

VQDRV(high)

8

10

–

12

–

14

V

Low Stage Voltage

VFault = 4 V

14

VQDRV(low)

–

0.25

V

QR FLYBACK FEEDBACK

Internal Pull−Up Current Source

10

IQFB

48

50

52

mA

Feedback Input Open Voltage

10

VQFB(open)

4.8

5.0

5.2

V

VQFB to Internal Current Setpoint Division Ratio

10

KQFB

3.95

4.0

4.15

–

QFB Pull Up Resistor

VPSTimer = 3 V;

VQFB = 0.4 V

10

RQFB

365

400

435

k

W

Valley Thresholds

Transition from 1st to 2nd valley

Transition from 2nd to 3rd valley

Transition from 3rd to 4th valley

Transition from 4th valley to VCO

Transition from VCO to 4th valley

Transition from 4th to 3rd valley

Transition from 3rd to 2nd valley

Transition from 2nd to 1st valley

VQFB decreasing

VQFB increasing

10

VH2D

VH3D

VH4D

VHVCOD

VHVCOI

VH4I

VH3I

VH2I

1.316

1.128

0.846

0.752

1.316

1.504

1.692

1.880

1.400

1.200

0.900

0.800

1.400

1.600

1.800

2.000

1.484

1.272

0.954

0.848

1.484

1.696

1.908

2.120

V

Skip Threshold

VQFB decreasing

10

VQSKIP

0.35

0.40

0.45

V

Skip Hysteresis

VQFB increasing

10

VQSKIP(HYS)

25

50

75

mV

Delay Exiting Skip Mode to 1st QDRV Pulse

Apply 1 V step from VQSKIP

10

tdelay(QSKIP)

–

10

ms

Maximum On Time

14

tonQR(MAX)

26

32

38

ms

QR FLYBACK TIMING CAPACITOR

QCT Operating Voltage Range

VQFB = 0.5 V

7

VQCT(peak)

3.815

4.000

4.185

V

On Time Control Source Current

VQCT = 0 V

7

IQCT

18

20

22

mA

Minimum voltage on QCT Input

7

VQCT(min)

–

90

mV

Minimum Operating Frequency in VCO Mode

VQCT = VQCT(peak) +

100 mV

7

fVCO(MIN)

23.5

27

30.5

kHz

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