NCP1239F(2005) View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

NCP1239F
(Rev.:2005)

Low−Standby High Performance PWM Controller

ON Semiconductor 

NCP1239

Skip 7

adjust

FB<Vpin1 => Skip high

+

Skip

100k

FB

+

450mV

−

15r

+

25r

−

S

Q

Q

R

FB>1.6*Vpin1 =>Stby_detect RESET

Stby_detect

Internal

Thermal

Shutdown

Fault

detect

3

−

2.5V +

Vcc

TSD

S

Q

Q

R

Fault

regOUT

10k

PFC_Vcc 1

1mA

pfcON

pfcOFF

Vcc < 4V

stdwn

UVLOs

Latch

Reset

UVLO

(Vcc<VccOFF)

OVL

Vdd

Regul

SS / timer 6

REF5V 2

Vdd

+

5V

Stby

Startup Phase

Vdd

OVL

S

Q

Q

R

Vstop

Soft−Start

and timer

management

Stby_detect

Error_Flag

Soft−Start

Ipk limit

Jittering

Modulation

Divider by 2 Vcc<7V

OUTon

Output

Buffer

14V

clamp

Ramp

Compensation

3.2V

pfcON

32k

CLK

BO 5

BO_in

+

0.5V / 0.25V

Vdd

−

BO_out

+

S

Q

Q

R

Vstop

LEB

16 HV

15

14

13 Vcc

12 Drv

11 GND

10 CS

Rt 4

2.5V

Vdd

20k

FB 8

to Skip

OSC

Oscillator

−

+

CLK

“Jittered”

Reference

Jittering

Modulation

Skip

−+

/3

Soft−Start

Ipk limit

0.9V

Error flag

+−

OSC

Vdd

Idmax

Figure 4. NCP1239V Internal Circuit Architecture

http://onsemi.com

8

9 Dmax

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