NCP1236 Ver la hoja de datos (PDF) - ON Semiconductor

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Fabricante

NCP1236

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1236

ELECTRICAL CHARACTERISTICS (continued)

(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

FREQUENCY FOLDBACK

Feedback voltage threshold

below which frequency foldback

starts

VFB(foldS)

1.8

2.0

2.2

Feedback voltage threshold

below which frequency foldback

is complete

VFB(foldE)

1.22 1.35 1.48

Minimum switching frequency

SKIP−CYCLE MODE

VFB = Vskip(in) + 0.2

fOSC(min)

22

27

32

Feedback voltage thresholds for

skip mode

LATCH−OFF INPUT

VFB going down

VFB going up

Vskip(in)

Vskip(out)

0.63

0.7

0.77

0.72 0.80 0.88

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 (Note 7)

Temperature shutdown

hysteresis (Note 7)

TJ going up

TJ going down

TTSD

135

150

165

TTSD(HYS)

20

30

40

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

7. Guaranteed by design.

Unit

V

V

kHz

V

V

V

mA

ms

ms

V

C

C

http://onsemi.com

7

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