NCP1254 datasheet(4/25 Pages) ONSEMI

Part #	NCP1254

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

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1254

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Table 3. MAXIMUM RATINGS TABLE

Symbol

Rating

Value

Unit

Vcc

Power Supply voltage, Vcc pin, continuous voltage

−0.3 to 35

V

Maximum voltage on low−power pins CS, FB and OPP

−0.3 to 10

V

VDRV

Maximum voltage on drive pin

−0.3 to Vcc+0.3

V

IOPP

Maximum injected current into the OPP pin

−2

mA

ISCR

Maximum continuous current into the Vcc pin while in latched mode

3

mA

RθJ−A

Thermal Resistance Junction−to−Air

360

°C/W

TJ,max

Maximum Junction Temperature

150

°C

Iscr

Maximum continuous current into Vcc pin when latched

3

mA

Storage Temperature Range

−60 to +150

°C

HBM

Human Body Model ESD Capability (All pins except HV) per JEDEC JESD22−A114F

2

kV

MM

Machine Model ESD Capability (All pins except DRV) per JEDEC JESD22−A115C

200

V

CDM

Charged−Device Model ESD Capability per JEDEC JESD22−C101E

500

V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.

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

Min

Typ

Max

Unit

SUPPLY SECTION

VCCON

VCC increasing level at which driving pulses are authorized

5

15.8

18

20

V

VCC(min)

VCC decreasing level at which driving pulses are stopped

5

8

8.8

9.4

V

VCCHYST

Hysteresis VccON−Vcc(min)

5

6

−

V

VZENER

Clamped Vcc when latched off @ ICC = 500 mA

5

−

7

−

V

ICC1

Start−up current

5

−

15

mA

ICC2

Internal IC consumption with VFB = 3.2 V, FSW = 65 kHz and CL = 0

5

−

1.4

2.2

mA

ICC3

Internal IC consumption with VFB = 3.2 V, FSW = 65 kHz and CL = 1 nF

5

−

2.1

3.0

mA

ICC4

Internal IC consumption with VFB = 4.5 V, FSW = 130 kHz and CL = 0

5

−

1.7

2.5

mA

ICC5

Internal IC consumption with VFB = 4.5 V, FSW = 130 kHz and CL = 1 nF

5

−

3.1

4.0

mA

ICCstby

Internal IC consumption while in skip mode

(Vcc = 12 V, driving a typical 6−A/600−V MOSFET)

750

mA

ICCLATCH

Current flowing into VCC pin that keeps the controller latched:

Tj = −40°C to 125°C

5

40

mA

Rlim

SCR current−limit series resistor

5

4

kW

DRIVE OUTPUT

Tr

Output voltage rise−time @ CL = 1 nF, 10−90% of output signal

6

−

40

−

ns

Tf

Output voltage fall−time @ CL = 1 nF, 10−90% of output signal

6

−

30

−

ns

ROH

Source resistance

6

−

13

−

W

ROL

Sink resistance

6

−

6

−

W

Isource

Peak source current, VGS = 0 V (Note 2)

6

300

mA

Isink

Peak sink current, VGS = 12 V (Note 2)

6

500

mA

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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