NCP1244AD065R2G datasheet(3/40 Pages) ONSEMI

Part #	NCP1244AD065R2G

Description	Fixed Frequency Current Mode Controller

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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NCP1244

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SIMPLIFIED INTERNAL BLOCK SCHEMATIC

Figure 2. Simplified Internal Block Schematic

freq folback

jittering

Skip_CMP

SkipB

4uMho

Ramp_OTA

CSref

Soft Start timer

Reset

Q

Set

Qb

Clamp

Fault timer

TSD

FB

CS

DRV

GND

VCC

Fault

Ilimit_CMP

PWM_CMP

SoftStart_CMP

LEB 250ns

LEB 120ns

CSstop_CMP

TSD

Latch

Enable

RESET

SS_end

Ilimit

Vfb(reg)

MAX_ton

Autorecovery timer

Reset

Q

Set

Qb

PWM

IC stop

V to I

Iopc = 0.5u*(Vhv−125)

Off_mode_CMP1

ICstart

FBbuffer

VCC

UVLO_CMP

LATCH

VccOVP

OTP

OTP_CMP

OVP_CMP

HV

VccOVP_CMP

Vdd

Set

Q

Reset Qb

Latch

RESET

OVP

AC_Off

UVLO

VCC

Vcc_Int

IC stopB

Vhv sample

SG & X2 & Vcc

Vdd reg

Vdd

Vcc regulator

PowerOnReset_CMP

control

Dual HV

start−up

current source

TSD

RESET

Vfb < 1.5V fix current setpoint 300mV

X2 discharge

10.8V regulator

ON_CMP

STOP_CMP

VccON

VccMIN

GoToOffMode timer 150ms

Set

Q

Reset Qb

Off_mode_CMP2

FM input

OSC 65kHz

PFM input

Square output

Saw output

ton_max output

3.0V

Vdd

+Shv

55 us

Filter

300 us

Filter

10 us

Filter

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NCP1244AD065R2G Datasheet(PDF) 3 Page - ON Semiconductor

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