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NCP1238

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1238

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

LATCH−OFF INPUT

High Threshold

Low Threshold

Current Source for Direct NTC Connection

During normal operation

During soft−start

VLatch going up

VLatch going down

VLatch = 0 V

VOVP

VOTP

2.37 2.5 2.63

0.76 0.8 0.84

INTC

78

91 104

INTC(SSTART) 156 182 208

Blanking Duration on High Latch Detection

Blanking Duration on Low Latch Detection

Clamping Voltage

ILatch = 0 mA

ILatch = 1 mA

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

Temperature Shutdown

TJ going up

TTSD

135 150 165

Temperature Shutdown Hysteresis

TJ going down

TTSD(HYS)

20

30

40

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

Unit

V

V

mA

ms

ms

V

°C

°C

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