NCP1237 データシートの表示（PDF） - ON Semiconductor

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NCP1237

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1237

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

HIGH VOLTAGE CURRENT SOURCE

Minimum voltage for current source operation

Current flowing out of VCC pin @ VHV = 60 V

Off−state leakage current

SUPPLY

VCC = 0 V

VCC = VCC(on) − 0.5 V

VHV = 500 V

VHV(min)

Istart1

Istart2

Istart(off)

−

−

60

0.2 0.5 0.8

4

8

12

−

25

50

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

Turn−off threshold level

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

VCC decreasing level at which the internal logic resets

VCC level for ISTART1 to ISTART2 transition

Internal current consumption (Note 6)

Guaranteed by design

DRV open, VFB = 3 V

VCC(min)

9.5 10.5 11.5

VCC(off)

8.5 9.5 10.5

tUVLO(blank)

7

10

13

VCC(reset)

4.0

5.2

6.5

VCC(inhibit)

0.4 0.65 0.9

ICC1

2.0 2.5 3.0

Cdrv = 1 nF, VFB = 3 V

ICC2

2.3 3.3 4.3

Off mode (skip or before

startup)

Fault mode (fault or latch)

ICC3

ICC4

0.9 1.2 1.5

0.4 0.7 1.0

BROWN−OUT AND LINE OVERVOLTAGE

Brown−out threshold voltage

Timer duration for line cycle drop−out

Overvoltage threshold

Blanking duration on line overvoltage detection

OSCILLATOR

VHV going up

VHV going down

VHV going up

VHV going down

VHV(start)

VHV(stop)

tHV

VHV(OV1)

VHV(OV2)

tOV(blank)

104 112 120

97 105 113

43

61

79

400 430 460

395 425 455

−

250

−

Oscillator frequency

Maximum duty ratio

Frequency jittering amplitude, in percentage of FOSC

Frequency jittering modulation frequency

OUTPUT DRIVER

Guaranteed by design

Guaranteed by design

fOSC

DMAX

Ajitter

Fjitter

60

65

70

75

80

85

$4 $6 $8

85 125 165

Rise time, 10% to 90% of VCC

Fall time, 90% to 10% of VCC

Current capability

Clamping voltage (maximum gate voltage)

VCC = VCC(min) + 0.2 V,

CDRV = 1 nF

trise

−

22

34

VCC = VCC(min) + 0.2 V,

CDRV = 1 nF

tfall

−

22

34

VCC = VCC(min) + 0.2 V,

CDRV = 1 nF

DRV high, VDRV = 0 V

DRV low, VDRV = VCC

IDRV(source)

− 1000

−

IDRV(sink)

− 1000 −

VCC = VCCmax – 0.2 V, DRV VDRV(clamp)

11

13.5

16

high

High−state voltage drop

VCC = VCC(min) + 0.2 V,

VDRV(drop)

−

−

1

RDRV = 33 kW, DRV high

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

Unit

V

mA

mA

V

V

V

ms

V

V

mA

V

ms

V

ms

kHz

%

%

Hz

ns

ns

mA

V

V

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