TI UCC28180满负荷效率高达95%的PFC控制方案

UCC28180EVM-573

主要特性

,

电路图

,

测 试连接图

,

材料厂清单和

PCB

元件布局图

.

The

UCC28180

is

a

flexible

and

easy-to-use,

8-pin,

active

Power

Factor

Correction (PFC) controller that operates under Continuous Conduction Mode

(CCM)

to

achieve

high

Power

Factor,

low

current

distortion

and

excellent

voltage regulation of boost pre- regulators in AC - DC front-ends. The controller

is suitable for universal AC input systems operating in 100-W to few-kW range

with

the

switching

frequency

programmable

between

18

kHz

to

250

kHz,

to

conveniently support both power MOSFET and IGBT switches. An integrated

1.5-A and 2-A (SRC-SNK) peak gate drive output, clamped internally at 15.2 V

(typical), enables fast turn-on, turn-off and easy management of the external

power switch without the need for buffer circuits.

Low- distortion wave shaping of the input current using average current mode

control is achieved without input line sensing, reducing the external component

count. In addition, the controller features reduced current sense thresholds to

facilitate the use of small value shunt resistors for reduced power dissipation,

especially important in high power systems. To enable low current distortion,

the controller also features trimmed internal current loop regulation circuits for

eliminating associated inaccuracies.

Simple

external

networks

allow

for

flexible

compensation

of

the

current

and

voltage

control

loops.

In

addition,

UCC28180

offers

an

enhanced

dynamic

response

circuit

that

is

based

on

the

voltage

feedback

signal

to

deliver

improved response under fast load transients, both for output over-voltage and

under-voltage

conditions.

An

unique

VCOMP

discharge

circuit

provided

in

UCC28180

is

activated

whenever

the

voltage

feedback

signal

exceeds

V

OVP_L

thus allowing a chance for the control loop to stabilize quickly and avoid

encountering

the

over-voltage

protection

function

when

PWM

shut-off

can

often

cause audible

noise.

Controlled

soft

start gradually

regulates

the

input

current during start- up and reduces stress on the power switches. Numerous

system-level protection features available in the controller include VCC UVLO,

peak

current

limit,

soft

over- current,

output

open-loop

detection,

output

over-voltage

protection

and

open-pin

detection

(VISNS).

A

trimmed

internal

reference

provides

accurate

protection

thresholds

and

regulation

set-point.

The

user

can

control

low

power

standby

mode

by

pulling

the

VSENSE

pin

below 0.82 V.

UCC28180

主要特性

:

8-pin Solution (no AC line sensing needed)

Wide

Range

Programmable

Switching

Frequency

(18

kHz

to

250

kHz

for

MOSFET and IGBT based PFC converters)

Trimmed Current Loop Circuits for Low iTHD

Reduced Current Sense Threshold (minimizes power dissipation in shunt)

Average Current-Mode Control

Soft Over Current and Cycle-by-Cycle Peak Current Limit Protection

Output Over-Voltage Protection with Hysteresis Recovery

Audible Noise Minimization Circuitry

Open Loop Detection

Enhance

Dynamic

Response

During

Output

Over

and

Under- Voltage

Conditions

Maximum Duty Cycle of 96%(typical)

Burst Mode for No Load Regulation

VCC UVLO, Low ICC Start-Up (<75 ?

A)

UCC28180

应用

:

Universal AC Input, CCM Boost PFC

converters in 100-W to Few-kW range

Server and Desktop Power Supplies

White Good Appliances (Air Conditioners,Refrigerators)

Industrial Power Supplies (DIN Rail)

Flat Panel TV (PDP

, LCD and LED) TVs

图

1. UCC28180

框图

评估板

UCC28180EVM-573

The UCC28180EVM-573 evaluation module (EVM) is a 360-W off-line power

factor correction (PFC) boost converter providing a nominal output voltage of

390-V

regulated

output

at

0.923

A

of

load

current.

The

PFC

converter

accommodates

an

input

voltage

range

of

85

VAC

to

265

VAC

and

uses

average current mode control at a fixed programmable switching frequency of

120 kHz. The UCC28180 incorporates a wide range of protection features to

ensure safe system operation.

The UCC28180EVM-573 highlights the many benefits of using the UCC28180

Continuous

Current

Mode

Boost

PFC

Controller

(TI

Literature

Number

SLUSBQ5). The controller operates under average current mode control at a

fixed programmable switching frequency of 120 kHz. Simple external current

and

voltage

loop

compensation,

along

with

advanced

protection

features,

make

this

controller

ideal

for

server

and

desktop

power

supplies,

industrial

power supplies, and white goods.

This user’s guide provides the schematic, component list, assembly drawing

for a single-sided printed circuit board application, and test set up necessary to

evaluate the UCC28180 in a typical PFC application.

The UCC28180EVM-573 is suited for use in high-power off-line systems that

require

high-efficiency

and

advanced

fault

protection

features,

applications

including, but not limited to:

? Server and Desktop Power Supplies

? Industrial Power Supplies (DIN Rail)

? White Goods

–

A/C Units

–

Refrigerators

–

etc.

评估板

UCC28180EVM-573

主要特性