NCP1237 datasheet(7/34 Pages) ONSEMI

tên linh kiện	NCP1237

Giải thích chi tiết về linh kiện	Fixed Frequency Current Mode Controller for Flyback Converters

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NCP1237

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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

Unit

Max

Typ

Min

Symbol

Test Condition

LATCH−OFF INPUT

High threshold

VLatch going up

VOVP

2.37

2.5

2.63

Low threshold

VLatch going down

VOTP

0.76

0.8

0.84

Current source for direct NTC connection

During normal operation

During soft−start

VLatch = 0 V

INTC

INTC(SSTART)

156

182

104

208

Blanking duration on high latch detection

tLatch(OVP)

Blanking duration on low latch detection

tLatch(OTP)

−

400

−

Clamping voltage

ILatch = 0 mA

ILatch = 1 mA

Vclamp0(Latch)

Vclamp1(Latch)

1.0

1.8

1.2

2.3

1.4

2.8

TEMPERATURE SHUTDOWN

Temperature shutdown

TJ going up

TTSD

135

150

165

°C

Temperature shutdown hysteresis

TJ going down

TTSD(HYS)

°C

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

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