NCP1288 查看數據表（PDF） - ON Semiconductor

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NCP1288

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1288

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

FREQUENCY FOLDBACK

Feedback Voltage Threshold below which frequency

foldback starts

VFB(fold)

1.3 1.4 1.5

Minimum Switching Frequency

Threshold below which the frequency foldback is

finished and the controller switches at fOSC(min)

SKIP CYCLE MODE

VFB = Vskip(in) + 0.2 V

fOSC(min)

21

27

31

VFB(endfold)

−

1.0

−

Feedback Voltage Thresholds for Skip Mode

Soft−Skip Duration

LATCH−OFF INPUT

VFB going down

VFB going up

From 1st pulse to VCS =

VFB(fold) / KFB

Vskip(in)

Vskip(out)

tSSKIP

0.63 0.7 0.77

0.72 0.80 0.88

−

100

−

High Threshold

Low Threshold

Current Source for Direct NTC Connection

During normal operation

During soft−start

Blanking Duration on High Latch Detection

Blanking Duration on Low Latch Detection

Clamping Voltage

TEMPERATURE SHUTDOWN

VLatch going up

VLatch going down

VLatch = 0 V

ILatch = 0 mA

ILatch = 1 mA

VOVP

VOTP

2.37 2.5 2.63

0.76 0.8 0.84

INTC

78

91 104

INTC(SSTART) 156 182 208

tLatch(OVP)

40

55

70

tLatch(OTP)

−

400

−

Vclamp0(Latch) 1.0

1.2

1.4

Vclamp1(Latch) 1.8

2.3

2.8

Temperature Shutdown

TJ going up

TTSD

135 150 165

Temperature Shutdown Hysteresis

TJ going down

TTSD(HYS)

20

30

40

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

Unit

V

kHz

V

V

ms

V

V

mA

ms

ms

V

°C

°C

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