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NCP1234

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1234

ELECTRICAL CHARACTERISTICS (For typical values TJ = 25C, for min/max values TJ = −40C to +125C, VHV = 125 V,

VCC = 11 V unless otherwise noted)

Characteristics

Test Condition

Symbol

Min

Typ

Max

LATCH−OFF INPUT

High threshold

Low threshold

Current source for direct NTC

connection

During normal operation

During soft−start

Blanking duration on high latch

detection

VLatch going up

VLatch going down

VLatch = 0 V

65 kHz version

100 kHz version

VOVP

VOTP

2.35

2.5

2.65

0.76

0.8

0.84

INTC

65

95

105

INTC(SSTART)

130

190

210

tLatch(OVP)

35

50

70

25

35

45

Blanking duration on low latch

detection

tLatch(OTP)

−

350

−

Clamping voltage

TEMPERATURE SHUTDOWN

ILatch = 0 mA

ILatch = 1 mA

Vclamp0(Latch)

1.0

1.2

1.4

Vclamp1(Latch)

2.0

2.4

3.0

Temperature shutdown

Temperature shutdown

hysteresis

TJ going up

TJ going down

TTSD

135

150

165

TTSD(HYS)

20

30

40

Unit

V

V

mA

ms

ms

V

C

C

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