NCP1282D View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

NCP1282D

High Performance Active Clamp/Reset PWM Controller Featuring 500 V Startup

ON Semiconductor 

NCP1282

1

Vin

Iinhibit

16

Istart

CAUX VAUX

+

VAUX(on)/

− VAUX(off1)/

VAUX(off2)

Disable

−

+

+

1V

−

VAUX(on) −

+

One Shot

Pulse

Vin

R1

2

Thermal

Shutdown

R2

UVOV

UVOV

Detector

STOP

VAUX

P.O.R.

Bias

5.0 V Reference

Disable_VREF

Central

Logic

S

Dominant

Reset Q

Latch

R

VUV Soft−Stop

Complete

Enable_Output

VAUX

Vref

RT

3V

2V

CT

6

RTCT

7

SYNC

CCSKIP

12

CSKIP

4

CS

10

SS

CSS

500 mA

Oscillator

DMAX

SYNC Clock

VREF

ICSKIP(C)

CSKIP

Comparator

+

CSKIP

Control

Logic

−

+

VCSKIP

−

Clock

S

Q

Dominant

Reset

Latch

R

Q

Delay

Logic

FF Reset

Saturation

Comparator

+

−

Not

+

3.6 V

−

Saturated

ICSKIP(D)

+

0.5 V

−

OUT

Clock

Ilimit

Comparator

−

+

−

+

PWM

VX

Comparator

Clock

Fixed 80 ns LEB

Not

Soft−Start

Saturated Comparator

−+

Soft−Stop

Complete

VREF

ISS(C)

Enable

Soft−Start

Soft−Stop

Control Logic

STOP

VX Soft−Start

Complete

FF

Comparator

−+

+

3V

−

+

0.2 V

−

ISS(D)

Enable_Output

FF Reset

VAUX

VREF

20 kW

270 kW

8

VREF

15

OUT1

14

PGND

13

OUT2

11

tD

RD

9

VEA

Vin

RFF

3

FF

CFF

5

GND

Figure 1. Detailed Block Diagram

http://onsemi.com

2

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