NCP1937C1DR2G datasheet(10/38 Pages) ONSEMI

Part #	NCP1937C1DR2G

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

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Manufacturer	ONSEMI [ON Semiconductor]

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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

PFC DISABLE

Voltage to Current Conversion Ratio

VQFB = 3 V, Low Line

VQFB = 3 V, High Line

6

Iratio1(QFB/PON)

Iratio2(QFB/PON)

14

15

16

mA

PFC Disable Threshold

VPONOFF decreasing

6

VPOFF

1.9

2.0

2.1

V

PFC Enable Hysteresis

VPONOFF = increasing

6

VPONHYS

0.135

0.160

0.185

V

PONOFF Operating Mode Voltage

tdemag/T = 70%,

RPONOFF = 191 kW,

CPONOFF = 1 nF

VQFB = 1.8 V (decreasing)

VQFB = 3 V (decreasing)

6

VPONOFF1

VPONOFF2

1.08

1.8

1.20

2.0

1.32

2.2

V

PFC Disable Timer

(See Table 2 for device options)

Disable Timer

6

tPdisable

0.45

3.6

11.7

0.50

4

13

0.55

4.4

14.3

s

PFC Enable Filter Delay

6

tPenable(filter)

50

100

150

ms

PFC Enable Timer

PONOFF Increasing

6

tPenable

200

–

500

ms

PFC Off−State Leakage Current

VPONOFF = 1 V,

VPFBHV = 500 V

20

IPFBHV(off)

–

0.1

3

mA

PFC Feedback Switch On Resistance

VPFBHV = 4.25 V,

IPFBHV = 100 mA

20

RPFBswitch(on)

–

10

k

W

PFC GATE DRIVE

Rise Time (10−90%)

VPDRV from 10 to 90%

of VCC

15

tPDRV(rise)

–

40

80

ns

Fall Time (90−10%)

90 to 10% of VPDRV

15

tPDRV(fall)

–

20

40

ns

Driver Resistance

Source

Sink

15

RPDRV(SRC)

RPDRV(SNK)

13

7

W

Current Capability

Source

Sink

VPDRV = 2 V

VPDRV = 10 V

15

IPDRV(SRC)

IPDRV(SNK)

–

500

800

–

mA

High State Voltage

VCC = VCC(off) + 0.2 V,

RPDRV = 10 kW

VCC = 26 V,

RPDRV = 10 kW

15

VPDRV(high)

8

10

–

12

–

14

V

Low Stage Voltage

VFault = 4 V

15

VPDRV(low)

–

0.25

V

PFC ZERO CURRENT DETECTION

Zero Current Detection Threshold

VPCS/PZCD rising

VPCS/PZCD falling

16

VPZCD(rising)

VPZCD(falling)

675

200

750

250

825

300

mV

Hysteresis on Voltage Threshold

VPZCD(rising) – VPZCD(falling)

16

VPZCD(HYS)

375

500

625

mV

Propagation Delay

16

tPZCD

50

100

170

ns

Input Voltage Excursion

Upper Clamp

Negative Clamp

IPCS/PZCD = 1 mA

IPCS/PZCD = −2 mA

16

VPCS/PZCD(MAX)

VPCS/PZCD(MIN)

6.5

−0.9

7

−0.7

7.5

0

V

Minimum detectable ZCD Pulse Width

16

tSYNC

–

70

200

ns

Missing Valley Timeout Timer

Measured after last ZCD

transition

16

tP(tout)

8

10

12

ms

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