Datasheet

UCC28089
SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006
2
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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 r etry 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
TEMPER
A
TURE R
A
NGE
PACKAGED DEVICES{
T
E
M
P
E
R
A
T
U
R
E
R
A
N
G
E
T
A
=T
J
SOIC--8 (D)
-- 4 0 °C to 105°C UCC28089D
†
D (SOIC--8) package is available taped and reeled. Add R suffix to device type (e.g. UCC28089DR) to order quantities of 2,500 devices per reel
(for D).
CONNECTION DIAGRAM
1
2
3
4
8
7
6
5
SYNC
DIS
CT
CS
VDD
OUTA
OUTB
GND
D PACKAGE (SOIC--8)
(TOP VIEW)