NCP1652_10 datasheet(3/34 Pages) ONSEMI

Part #	NCP1652

Description	High-Efficiency Single Stage Power Factor Correction and Step-Down Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1652, NCP1652A

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3

AC COMP

AC IN

Startup

Ispos

Dual HV

start−up

current source

VCC

Management

HV current

VCC(off)

VDD

Reset

Start

VCCOK

Reset

VDD

GND

VCC

Latch−Off

S

R

Q

tLatch(delay)

blanking

Reset

Latch

−

+

Vlatch(high)

−

+

Vlatch(low)

VDD

Vlatch(clamp)

OVP Comparator

OTP Comparator

Ilatch(shdn)

OUTB

OUTA

Iavg

Rdelay

CM

VFF

FB

CT

Ramp

Comp

Oscillator

DC Max

Sawtooth

Jitter

Adj.

S

R

Q

Delay

Adj.

gm

Reference

Generator

−

+

V−to−I

+ inverter

−

+

−

+

21.33kW

tLEB

Blanking

tLEB

Blanking

V−to−I

4V

−

+

VSSKIP

tSSKIP

Start

Soft−skip Ramp

Delay

−

+

VSSKIP(TLD)

Terminate

−

+

VSSKIP(sync)

Ramp Comp

Inst. current B

Inst.

current B

Inst. current A

Jitter

Ramp. Comp.

Adj.

Ramp Comp

Clock

DC Max

Clock

DC Max

Delay

FB

−

+

VOVLD

tOVLD

Enable

Overload

Timer

RFB

VDD

FB

S

R

Q

OVLD

x 2

counter

Enable

Reset

−

+

VBO

VFF

BO

Out

VCCOK

BO

OVLD

Latch

AC error

Amplifier

Current sense

amplifier

PWM

comparator

PWM Skip

Comparator

AC In skip

comparator

FB skip

Comparator

Transient Load Detect

Comparator

FB overload

comparator

VFFBrown−Out

Comparator

Ilatch(clamp)

Output

Driver

Output

Driver

gm

+

Figure 2. Detailed Block Diagram

VFF

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