OSCILLATOR. UCC28089 Datasheet

UCC28089 Datasheet PDF


Part

UCC28089

Description

PRIMARY-SIDE PUSH-PULL OSCILLATOR

Manufacture

etcTI

Page 25 Pages
Datasheet
Download UCC28089 Datasheet


UCC28089 Datasheet
UCC28089
SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006
PRIMARY-SIDE PUSH-PULL OSCILLATOR
WITH DEAD-TIME CONTROL
FEATURES
D Push-Pull Oscillator With Programmable
Deadtime
D High-Current Totem-Pole Dual Output Stage
Drives Push-Pull Configuration with 1-A Sink
and 0.5-A Source Capability
D Can be Used in Push-Pull, Half-Bridge, or
Full-Bridge Topologies
D Oscillator Synchronization Output
D Low Start-Up Current of 130 μA and 1.4-mA
Typical Run Current
D Over-Current Shutdown
D Digitally Controlled Over-Current/Retry
Feature
D Undervoltage Lockout With Hysteresis
TYPICAL APPLICATION
+
VIN = 48 V
--
RA UCC28089
1 SYNC VDD 8
2 DIS OUTA 7
RB 3 CT OUTB 6
CT 4 CS GND 5
APPLICATIONS
D High Efficiency Cascaded Converters
D Inverters
D Electronic Ballasts
D Uninterruptable Power Supplies (UPS)
D AC or DC Links
DESCRIPTION
The UCC28089 is a versatile BiCMOS controller for
dc-to-dc or off-line fixed-frequency switching power
supplies. The UCC28089 has dual alternating output
stages in dual-alternating push-pull configuration. Both
outputs switch at half the oscillator frequency using a
toggle flip-flop and duty cycle is limited to less than 50%.
BIAS
UCC2540
G1 18
2 REF VDD 16
PGND 15
4 SYNCIN G2 14
VO
=
1.2 V
+
--
UDG-04112
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.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
1

UCC28089 Datasheet
UCC28089
SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006
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
TA = TJ
PACKAGED DEVICES{
SOIC--8 (D)
--40°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
D PACKAGE (SOIC--8)
(TOP VIEW)
SYNC
DIS
CT
CS
1
2
3
4
8 VDD
7 OUTA
6 OUTB
5 GND
2 www.ti.com


Features Datasheet pdf UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 PRIMARY-SIDE PUSH-P ULL OSCILLATOR WITH DEAD-TIME CONTROL FEATURES D Push-Pull Oscillator With Pr ogrammable Deadtime D High-Current Tote m-Pole Dual Output Stage Drives Push-Pu ll Configuration with 1-A Sink and 0.5- A Source Capability D Can be Used in Pu sh-Pull, Half-Bridge, or Full-Bridge To pologies D Oscillator Synchronization O utput D Low Start-Up Current of 130 μA and 1.4-mA Typical Run Current D Over- Current Shutdown D Digitally Controlled Over-Current/Retry Feature D Undervolt age Lockout With Hysteresis TYPICAL APP LICATION + VIN = 48 V -- RA UCC28089 1 SYNC VDD 8 2 DIS OUTA 7 RB 3 CT OUTB 6 CT 4 CS GND 5 APPLICATIONS D High Effi ciency Cascaded Converters D Inverters D Electronic Ballasts D Uninterruptable Power Supplies (UPS) D AC or DC Links DESCRIPTION The UCC28089 is a versatile BiCMOS controller for dc-to-dc or off- line fixed-frequency switching power su pplies. The UCC28089 has dual alternating output stages in dual-.
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