PFS7523L datasheet(4/36 Pages) POWERINT

4 / 36 page

Rev. A 06/15

PFS7523-7529/7533-7539

www.power.com

Figure 4. Functional Block Diagram.

DRAIN (D) Pin:

This is the drain connection of the internal power switch.

BOOST DIODE CATHODE (K) Pin:

This is the cathode connection of the internal Qspeed Diode.

Functional Description

The HiperPFS-3 is a variable switching frequency boost PFC solution.

More specifically, 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).

Integrating 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)

PI-7226-062215

BIAS POWER (VCC)

BOOST DIODE CATHODE (K)

DRAIN (D)

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

Off-Time Controller

On-Time Controller

Integrated Qspeed

Ultrafast Diode

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

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

onds 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 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 regarded as substantially constant for a half line cycle. With

this constant charge (or amp-second) control, the following relation-

ship 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.

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