NCP1252 Ver la hoja de datos (PDF) - Unspecified

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NCP1252

Current Mode PWM Controller for Forward and Flyback Applications

Unspecified 

NCP1252

Table 3. ELECTRICAL CHARATERISTICS

(VCC = 15 V, RT = 43 kW, CDRV = 1 nF. For typical values TJ = 25°C, for min/max values TJ = –25°C to +125°C, unless otherwise noted)

Characteristics

Test Condition

Symbol

Min

Typ

Max Unit

DRIVE OUTPUT

Clamping voltage (maximum gate voltage)

High−state voltage drop

CYCLE SKIP

VCC = 25 V

VCL

−

RDRV = 47 kW, CDRV = 1 nF

VCC = VCC(min) + 100 mV, RDRV VDRV(clamp)

−

= 47 kW, CDRV = 1 nF

15

18

V

50

500 mV

Skip cycle level

Skip threshold Reset

Skip threshold Hysteresis

SOFT START

Vskip

0.2

0.3

0.4

V

Vskip(reset)

−

Vskip+

−

V

Vskip(HY

S)

Vskip(HYS)

−

25

−

mV

Soft−start charge current

Soft start completion voltage threshold

Internal delay before starting the Soft start when

VCC(on) is reached

PROTECTION

SS pin = GND

ISS

8.8

10

11

mA

VSS

3.5

4.0

4.5

V

SSdelay

100

120

155 ms

Current sense fault voltage level triggering the

timer

FCS

0.9

1

1.1

V

Timer delay before latching a fault (overload or

short circuit)

When CS pin > FCS

Tfault

10

15

20

ms

Brown−out voltage

Internal current source generating the Brown−out

hysteresis

3. Guaranteed by design

4. Vramp, Rramp Guaranteed by design

−5°C ≤ TJ ≤ +125°C

−25°C ≤ TJ ≤ +125°C

VBO

0.974

1

1.026 V

IBO

8.8

10

11.2 mA

8.6

10

11.2

TYPICAL CHARACTERISTICS

10.2

10.0

VCC(on)

9.8

9.6

9.4

9.2

9.0

VCC(off)

8.8

−40 −20 0 20 40 60 80 100 120

TEMPERATURE (°C)

Figure 3. Supply Voltage Threshold vs.

Junction Temperature

1.20

1.15

1.10

1.05

1.00

0.95

0.90

−40 −20 0 20 40 60 80 100 120

TEMPERATURE (°C)

Figure 4. Supply Voltage Hysteresis vs.

Junction Temperature

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