UCC28089

SLUS623 − SEPTEMBER 2004

2

www.ti.com

DESCRIPTION (CONTINUED)

The UCC28089 is optimized for use as the primary-side companion controller for a cascaded converter that has

secondary-side control. The device incorporates dead-time programming. The synchronization output also

provides dead-time information. The retry and soft-start duration scales with the oscillator clock frequency for

high performance fault recovery.

The UCC28089 also provides primary side under-voltage protection (UVLO), and over-current protection. Both

the soft start and retry after fault durations scale with oscillator frequency for high performance. The turn-on/off

UVLO thresholds are 10.5 V/8.0 V.

ORDERING INFORMATION

TEMPERATURE RANGE

PACKAGED DEVICES

{

TEMPERATURE RANGE

TA = TJ

SOIC−8 (D)

SON−8 (DRB)

}

−40

°C to 105°C

UCC28089D

UCC28089DRB

† D (SOIC−8) and DRB (SON−8) packages are available taped and reeled. Add R suffix to device type (e.g. UCC28089DR or UCC28089DRBR)

to order quantities of 2,500 devices per reel (for D), and 1,000 devices per reel (for DRB).

‡ Contact factory through TI sales for the availability of this package. Target availability is October 2004.

CONNECTION DIAGRAM

1

2

3

4

8

7

6

5

SYNC

DIS

CT

CS

VDD

OUTA

OUTB

GND

D PACKAGE (SOIC−8)

(TOP VIEW)

8

7

6

5

SYNC

DIS

CT

CS

VDD

OUTA

OUTB

GND

1

2

3

4

DRB PACKAGE (SON−8)

(TOP VIEW)