NCP1028 Ver la hoja de datos (PDF) - ON Semiconductor

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NCP1028

High−Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power

ON Semiconductor 

NCP1028

IC1

VCC

Vclamp

+ 20 ms RC

−

+

S

Vlatch

Q

Q

R

VCC < 4 V

IBO

Reset

BO

+

−

VBO +

VCC

Mngt

Fault

UVLOs

4 V rst

VDD

LEB

Timer

Ramp

Comp.

65 kHz or

100 kHz

Jittering

CLOCK

S

Icomp Vdd

Q

Q

R

25%

+ of lp

+ Skip

−

Ip Flag

Vcc

Vdd

RFB

FB

−+

Soft−Start

UVLO

GND

OPP

Drain

+

−

Ip Flag

Max Ip Selection

Over Power

Protection Input

Ramp Compensation

Figure 2. Internal Block Diagram

http://onsemi.com

3

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