PFS7623L datasheet(5/38 Pages) POWERINT

5 / 38 page

Rev. F 08/20

PFS7x23-7x29/7633-7636

www.power.com

Figure 4. Functional Block Diagram.

PI-7969a-081920

BIAS POWER (VCC)

DRAIN (D)

BOOST DIODE CATHODE (K)

SOURCE (S)

SIGNAL GROUND (G)

POWER GOOD

(PG)

POWER GOOD

THRESHOLD

(PGT)

REFERENCE

(REF)

FEEDBACK

(FB)

UVLO

12 V GATE DRIVER

REF SERIES/SHUNT

REGULATOR

REFERENCE

AND BAND GAP

VOLTAGE MONITOR (V)

HL/LL

MON(PFE)

INPUT LINE INTERFACE

ADC

PEAK

DETECTOR

ENHANCER

LOW/HIGH

LINE DETECT

BROWN-IN/

OUT DETECT

BO, BI

COMPENSATION (C)

VBRST

~(VO-VIN)

FBREF

FEEDBACK Pin

OV/UV/OFF

Integrated Qspeed

Ultrafast Diode

(Diode option in PFS772xH/L only)

Off-Time Controller

On-Time Controller

senseFET

Power

MOSFET

Feedback UV

Buffer and

De-Glitch

Filter

Feedback OFF

OFF × (VFB - VV)

CINT

PON

FBREF VPG(H) FBUV FBOFF

IOCP

FBOV

IPGT

FBOV

FBUV

FBOFF

VFB

VPG(H)

REF

IPGT

IOCP

ISNS

VOFF

VBRST

CINT

HL/LL

PON × MON(PFE) × ISNS

VCC

Latch

START-UP,

FMEA CHECKS

POWER LIMIT

SOA RAMP

Frequency

Slide

MON(PFE) is the switch

current sense scale

factor which is a function

of the peak input voltage

OCP

HL/LL

LEB

Feedback OV

Non-Linear OTA

OTA

VOFF is a function of the error-voltage

(VE) and is used to reduce

the average operating frequency

as a function of output power

VCC

Functional Description

The HiperPFS-4 family are variable switching frequency boost PFC

devices. It employs a constant amp-second on-time and constant

volt-second off-time control algorithm. This algorithm is used to

regulate the output voltage and shape the input current to comply

with regulatory harmonic current limits (high power factor). Integrat-

ing the switch current and controlling it to have a constant amp-sec

product over the on-time of the switch allows the average input

current to follow the input voltage. Integrating the difference

between the output and input voltage maintains a constant volt-

second balance dictated by the electro-magnetic properties of the

boost inductor and thus regulates the output voltage and power.

More specifically, the control technique sets constant volt-seconds for

the off-time (t

OFF). The off-time is controlled such that:

OINOFF

(1)

Since the volt-seconds during the on-time must equal the volt-

seconds during the off-time, to maintain flux equilibrium in the PFC

choke, the on-time (t

ON) is controlled such that

(2)

The controller also sets a constant value of charge delivered during

each on-cycle of the power MOSFET. The charge per cycle is varied

gradually over many switching cycles in response to load changes so

it can be considered constant for a half line cycle. With this constant

charge (or amp-second) control, the following relationship is therefore

also true:

(3)

Substituting t

ON from (2) into (3) gives:

(4)

The relationship of (4) demonstrates that by controlling a constant

amp-second on-time and constant volt-second off-time, the input

current I

IN is proportional to the input voltage VIN, therefore providing

the fundamental requirement of power factor correction.

This control produces a continuous mode power switch current

waveform that varies both in frequency and peak current value across

a line half-cycle to produce an input current proportional to the input

voltage.

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