NCP1254 查看數據表（PDF） - ON Semiconductor

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NCP1254

Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion

ON Semiconductor 

NCP1254

Table 4. ELECTRICAL CHARACTERISTICS

(For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, Max TJ = 150°C, Vcc = 12 V unless otherwise noted)

Symbol

Rating

Pin

Min

Typ

Max

Unit

INTERNAL SLOPE COMPENSATION

Vramp

Rramp

PROTECTIONS

Internal ramp level @ 25°C (Note 4)

Internal ramp resistance to CS pin

4

2.5

V

4

20

kW

Vlatch

Tlatch−blank

Tlatch−count

Tlatch−del

Timer1

Timer2

VSC

VOVL

Latching level input

Blanking time after drive turn off

Number of clock cycles before latch confirmation

OVP detection time constant

Default − Overload Fault timer duration

Default − Fault timer duration when VFB > 4.1 V is Timer1/4

Feedback voltage beyond which a short−circuit is considered

Feedback voltage beyond which an over load is considered –

OPP pin is grounded

3

2.7

3

3.3

V

3

1

ms

−

4

3

600

ns

−

160

208

270

ms

−

40

52

68

ms

2

3.9

4.1

4.3

V

2

3.2

V

VOVP(regular)

Latched Over voltage protection on the Vcc rail

5

30.7

32.3

34

V

VOVP(copack)

Latched Over voltage protection on the Vcc rail

5

26

27.5

29

V

TOVP−del

Delay before OVP on Vcc confirmation

5

20

ms

2. Guaranteed by design

3. See characterization table for linearity over negative bias voltage – we recommend keeping the level on pin 3 below −300 mV.

4. A 1−MW resistor is connected from pin 4 to the ground for the measurement.

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