NCP1252CDR2G datasheet(5/18 Pages) ONSEMI

Part #	NCP1252CDR2G

Description	Current Mode PWM Controller for Forward and Flyback Applications

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NCP1252

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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

Unit

Max

Typ

Min

Symbol

Test Condition

DRIVE OUTPUT

Clamping voltage (maximum gate voltage)

VCC = 25 V

RDRV = 47 kW, CDRV = 1 nF

VCL

−

15

18

V

High−state voltage drop

VCC = VCC(min) + 100 mV, RDRV

= 47 kW, CDRV = 1 nF

VDRV(clamp)

−

50

500

mV

CYCLE SKIP

Skip cycle level

Vskip

0.2

0.3

0.4

V

Skip threshold Reset

Vskip(reset)

−

Vskip+

Vskip(HY

S)

−

V

Skip threshold Hysteresis

Vskip(HYS)

−

25

−

mV

SOFT START

Soft−start charge current

SS pin = GND

ISS

8.8

10

11

mA

Soft start completion voltage threshold

VSS

3.5

4.0

4.5

V

Internal delay before starting the Soft start when

VCC(on) is reached

SSdelay

100

120

155

ms

PROTECTION

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

VBO

0.974

1

1.026

V

Internal current source generating the Brown−out

hysteresis

−5°C ≤ TJ ≤ +125°C

−25°C ≤ TJ ≤ +125°C

IBO

8.8

8.6

10

11.2

mA

3. Guaranteed by design

4. Vramp, Rramp Guaranteed by design

TYPICAL CHARACTERISTICS

Figure 3. Supply Voltage Threshold vs.

Junction Temperature

Figure 4. Supply Voltage Hysteresis vs.

Junction Temperature

TEMPERATURE (°C)

100

80

60

40

20

0

−20

−40

8.8

9.0

9.2

9.4

9.6

9.8

10.0

10.2

100

80

60

40

20

0

−20

−40

0.90

0.95

1.00

1.05

1.10

1.15

1.20

120

VCC(on)

VCC(off)

120

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