V

IN

V

OUT

12V to 21V

M2

R

B

R

A

R

B

M1

L2

D2

D1

C

OUT

R

A

C

PC

C

PC

C

ZC

C

ZC

R

ZC

R

ZC

C

SS

R

RDM

R

RT

T1

T2

C

CDR

R

DMX

R

SYN

C

REF

R

PK1

R

PK2

C

ZV

R

ZV

C

PV

R

S

R

S

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

CAOA

CAOB

PKLMT

GND

VAO

VINAC

VSENSE

CSA

CSB

RT

CDR

SS

GDB

GDA

IMO

VCC

RSYNTH

VREF

DMAX

RDM

R

IMO

To CSB

To CSA

From Ixfrms

L1

UCC28070A

www.ti.com

SLUSAW0 – MARCH 2012

Extended Frequency Range (10 kHz to 300 kHz),

Interleaving Continuous Conduction Mode PFC Controller

Check for Samples: UCC28070A

1

FEATURES

APPLICATIONS

•

Interleaved Average Current-Mode PWM

•

Air Conditioners and White Goods

Control with Inherent Current Matching

•

PFC Applications with IGBT Power Switches

•

Advanced Current Synthesizer Current

•

High-Efficiency Server and Desktop Power

Sensing for Superior Efficiency

Supplies

•

Highly-Linear Multiplier Output with Internal

•

Telecom Rectifiers

Quantized Voltage Feed-Forward Correction

•

Industrial Equipment

for Near-Unity PF

•

Extended Range Programmable Frequency (10

DESCRIPTION

kHz to 300 kHz)

The UCC28070A is an extended frequency range

•

Programmable Maximum Duty-Cycle Clamp

derivative of UCC28070, capable of operating at low

switching frequencies desired for IGBT power switch

•

Programmable Frequency Dithering Rate and

based PFC converters in high power applications.

Magnitude for Enhanced EMI Reduction

The UCC28070A is capable of operating in frequency

–

Magnitude: 3 kHz to 30 kHz

range 10 kHz to 300 khz, thus extending the range of

–

Rate: Up to 30 kHz

operation compared to UCC28070 whose minimum

•

External Clock Synchronization Capability

operating frequency was limited to 30 khz. All the

other features and benefits of UCC28070 are also

•

Enhanced Load and Line Transient Response

available in UCC28070A. The 180 degree out-of-

through Voltage Amplifier Output Slew-Rate

phase interleaved operation generates substantial

Correction

reduction in input and output ripple currents and

•

Programmable Peak Current Limiting

conducted EMI filtering becomes easier and less

•

Bias-Supply UVLO, Over-Voltage Protection,

expensive.

Open-Loop Detection, and PFC-Enable

Monitoring

•

External PFC-Disable Interface

•

Open-Circuit Protection on VSENSE and

VINAC pins

•

Programmable Soft Start

•

20-Lead TSSOP Package

Simplified Application Diagram

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.