Datasheet > R2A20111

R2A20111

更新时间： 2024-11-21 09:46:03

品牌	Logo	应用领域
瑞萨 - RENESAS		电视功率因数校正
页数	文件大小	规格书
1页	57K
描述
Renesas PFC Control IC for Digital-TV

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中文翻译

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R2A20111 数据手册

Renesas PFC Control IC for Digital-TV

R2A20111

April 2010

Features

VCC

OUT

1. Continuous conduction mode is suitable for the system with large

and high frequency variation of current.

2. Easy design by separate current terminal.

3. Hold function countermeasure to AC temporary blackout.

It is possible to set no soft start time by chip capacitor.

4. Feed back loop detector.

GND

DIP16

DELAY

CGND

IAC

PFC-ON

CAI

VREF

CAO

SOP16

CLIMIT

5. Soft start period become short by quick soft start function.

6. Improve the load regulation by gm Amp at feed back Amp.

1. Continuous conduction mode suitable for the system 2. Easy design by separate current terminal

Input average current

Input voltage

Conventional

R2A20111

Advantages

Weaknesses

V-AMP

• Small radiation noise • A little bit complex

Constant

power

limiter

• Small peak current

• Non-influenced of

circuit.

Multi

Choke coil current

CAI

current change.

Continuous conduction mode

Multi

C-AMP

• Large radiation noise

• Large peak current

• Large choke coil

• Simple circuit

C-limiter

C-AMP

VREF

CLIMIT

C-limiter

Critical conduction mode

(Discontinuous)

Possible to set no coil vibration at start up and current limit.

lout change case

4. Feed back loop detector

In case of continuous

current mode, not so much

change peak current.

Built in over voltage protection.

And feedback loop absence detection can stop output pulse and PG.

Therefore bulk capacitor & FET is not broken by R2A20111.

In case of critical current

mode, the peak current

is so large.

Conventional

R2A20111

Bulk voltage

Large current change

The feed back loop

disconnection is detected,

and stop pulse!

In case of feed back

loop down, bulk

voltage rise up to

abnormal voltage. And

capacitor is broken.

3. Hold function countermeasure to AC temporary blackout

cut

AC input

AC blackout

Prevention from destruction

of bulk capacitor and power

MOSFET!

Hold counter

Bulk voltage

Conventional IC

w/o this function

R2A20111

Hold timer (Adjustable)

FET OUT

(R2A20111)

6. Improve load regulation by gm Amp at feed back Amp

FET OUT

(Conventional IC)

In voltage feedback Amp case, feedback current flow

influence to load regulation.

IC operation does not stop for set period, therefore recovery is

faster, available in the area where power supply is not stable.

Conventional

R2A20111

5. Soft start period become short by quick soft start function^VOUT

VOUT

Css=4.7uF

Improved time=4.7uFX1V/25uA=188ms.

Error Amp

VEO

Soft start voltage

Triangle wave

Error Amp

Renesas

VREF

General soft start period

Example of Application Circuit

380V

12V

Small & high reliability systems

• Target power range is over 300V.

• Realize high reliability on PFC block by R2A20111 and

coordinate next stage by P.G.

• Realize small transformer and high efficiency by using

half bridge topology by HA16150.

R2A20111

HA16150

RJK5015

HA16116

RJK5015

Possible to use 500V type FET

Down sizing trance

Renesas Electronics URL http://www.renesas.com/pfcic

中文翻译

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