NCP1238AD65R2G datasheet(7/30 Pages) ONSEMI

Part #	NCP1238AD65R2G

Description	Fixed Frequency Current Mode Controller for Flyback Converters

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1238

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7

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

V

Low Threshold

VLatch going down

VOTP

0.76

0.8

0.84

V

Current Source for Direct NTC Connection

During normal operation

During soft−start

VLatch = 0 V

INTC

INTC(SSTART)

78

156

91

182

104

208

mA

Blanking Duration on High Latch Detection

tLatch(OVP)

40

55

70

ms

Blanking Duration on Low Latch Detection

tLatch(OTP)

−

400

−

ms

Clamping Voltage

ILatch = 0 mA

ILatch = 1 mA

Vclamp0(Latch)

Vclamp1(Latch)

1.0

1.8

1.2

2.3

1.4

2.8

V

TEMPERATURE SHUTDOWN

Temperature Shutdown

TJ going up

TTSD

135

150

165

°C

Temperature Shutdown Hysteresis

TJ going down

TTSD(HYS)

20

30

40

°C

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

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NCP1238AD65R2G Datasheet(PDF) 7 Page - ON Semiconductor

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