NCP1219 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1219

PWM Controller with Adjustable Skip Level and External Latch Input

ON Semiconductor 

NCP1219

Skip/latch

Rskip

FB

CS

Rramp

CS

Latched overload

Istart when VCC > Vinhibit

2V

(Option A)

Iinhibit when VCC < Vinhibit

Rupper

42.0k*

Vlatch

-

latch−off, reset when

VCC < VCC(reset)

50 ms*

R

R

+

filter

SQ

Rlower

SQ

51.3k*

(Option A)

VFB(open)

VSkip

VSkip(max)

VSkip/latch

Skip

Comparator

+

-

VCC(on)

-

VFB 16.7k*

VFB / 3

+

-

soft−

Soft−Start/PWM Clamp start

VILIM set

TSD

+

75 ms*

filter

Normal = VCC(min)

Fault = VCC(hiccup)

−

tSSTART time

+

VCC(reset)

clamp

detect

tOVLD

timer

UVLO

Iramp(peak) VDD

reset

+

-

PWM

0

Iramp

VCS

-

+

LEB

Fault

Management

Double Hiccup

Counter

HV

VCC

RCS

GND

Maximum

Duty Ratio

detect

Oscillator

7.5%* Jittering

disable

internal

bias

RQ

S

VCC

DRV

* Typical values are shown

Figure 2. Functional Block Diagram

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