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UCC28089

SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006

PRIMARY-SIDE PUSH-PULL OSCILLATOR

WITH DEAD-TIME CONTROL

www.ti.com

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 μAand1.4-mA

Typical Run Current

D Over-Current Shutdown

D Digitally Controlled Over-Current/Retry

Feature

D Undervoltage Lockout With Hysteresis

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 u sing a

toggle flip-flop and duty cycle is limited to less than 50%.

TYPICAL APPLICATION

UCC28089

SYNC

DIS

VDD

OUTA

OUTB

GND

UCC2540

REF

SYNCIN

VDD

PGND

BIAS

UDG-04112

=48V

=1.2V

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

as 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.

Summary of content (23 pages)

PAGE 1
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 PRIMARY-SIDE PUSH-PULL OSCILLATOR WITH DEAD-TIME CONTROL FEATURES D Push-Pull Oscillator With Programmable Deadtime High-Current Totem-Pole Dual Output Stage Drives Push-Pull Configuration with 1-A Sink and 0.5-A Source Capability Can be Used in Push-Pull, Half-Bridge, or Full-Bridge Topologies Oscillator Synchronization Output Low Start-Up Current of 130 μA and 1.
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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.
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UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature (unless otherwise noted)†} PARAMETER Supply voltage (IDD < 10 mA) SYMBOL RATING UNITS VDD 15 V mA Supply current OUTA/OUTB sink current (peak) OUTA/OUTB source current (peak) IDD 20 IOUT(sink) 1.0 IOUT(source) --0.5 A SYNC sink current (peak) 50 SYNC source current (peak) --50 Analog inputs (DIS, CT, CS) --0.3 to VDD + 0.
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UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 ELECTRICAL CHARACTERISTICS: TA = --40°C to 105°C for UCC28089, VDD = 9 V (see Note 1), 1 μF capacitor from VDD to GND, RA = 110 kΩ, RB = 182 Ω, CT = 220 pF, TA = TJ, (unless otherwise noted). PARAMETER TEST CONDITION MIN TYP MAX UNITS Overall Section Startup current VDD < UVLO start threshold (see Note 2) 130 260 μA Operating supply current CS = 0 V, (see Note 1, Note 2) 1.4 2.0 mA Undervoltage Lockout Start threshold 9.5 10.
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UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 FUNCTIONAL BLOCK DIAGRAM UCC28089 VDD SYNC 1 OSCILLATOR DIS 2 UVLO 8 VDD VDD/5 S Q VDD/19.6 R Q CT 3 CK VDD = 10.5/8.0 V VDD SOFT--START & FAULT OUTPUT LOGIC 56 STEP START DELAY GO OVER CURRENT COMP R 7 OUTA VDD/5 GO REF SS LATCH 7 STEP SOFT-- + START RAMP 0.2V S Q SS COMP CS 4 6 OUTB R Q Q _ T Q 0.
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UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 APPLICATION INFORMATION UCC28089 is an alternating dual-driver output oscillator with over-current and under-voltage fault protection. This feature set is ideal as a start-up controller for isolated power systems where the majority of control functions are performed on the secondary side.
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UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 APPLICATION INFORMATION The recommended oscillator frequency range is up to 1 MHz. In order to avoid noise issues, RA and RB should be small enough for the oscillator to have at least 10 μA of current. There are two sets of oscillator programming equations that model the oscillator over its wide programming range.
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UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 APPLICATION INFORMATION Using the UCC28089 as the Primary-Side start-up Controller in a Cascaded Push-Pull Buck Two-Stage Converter The cascaded push-pull topology is ideal for converting from moderate bus voltages, such as 48-V telecom buses, to sub 2-V output voltages. The general topology is shown in Figure 2 using the UCC28089 as the primary-side start-up controller and the UCC2540 as the secondary-side regulator [3]. + + VO 1.
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UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 APPLICATION INFORMATION Program the oscillator frequency of the UCC28089 to equal the desired switching frequency of the output post regulator. The secondary-side controller may also need corresponding switching frequency programming, such as RAMP and G2C capacitor values for the UCC2540.
PAGE 10
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 APPLICATION INFORMATION Synchronization of Multiple UCC28089 Controllers to an External Signal In systems where multiple UCC28089 parts need to be synchronized to a common clock, a 3.3-V logic-level signal can be directly applied to the CT pin (the SYNC pin on UCC28089 only provides output sync signals). As shown in Figure 4, the externally supplied sync pulse width determines the frequency and the dead time between OUT A and OUT B.
PAGE 11
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 APPLICATION INFORMATION Using the UCC28089 as a Modified Square Wave Inverter Remote or dc-only power systems often require a limited amount of 60-Hz ac line power to supply small appliances. Compatible loads include universal motors, incandescent lamps, and other electronic devices with switched mode power supplies to convert the 110-VAC to lower dc voltages.
PAGE 12
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 APPLICATION INFORMATION If desired, the 60-Hz modified square wave inverter frequency could be programmed using an external sync signal that might originate from a separate oscillator or digital controller. The following diagram in Figure 6 shows a 50% duty cycle square wave fed into the CT pin, with a frequency of 120 Hz, and the resulting OUTA/OUTB wave shapes. 16.
PAGE 13
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 TYPICAL CHARACTERISTICS OSCILLATOR FREQUENCY vs TEMPERATURE 220 RA = 221 kΩ RB = 3.
PAGE 14
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 TYPICAL CHARACTERISTICS OSCILATOR FREQUENCY vs RA x CT 1M 10 μ Tdischarge -- Discharge Time-- s RA = 76.8 kΩ RB = 0 Ω VDD = 10 V fOSC -- Oscilator Frequensy -- Hz DISCHARGE TIME vs CT 100 K 10 K 1K RA = 76.
PAGE 15
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 PROPAGATION DELAY (SYNC RISE TO OUTPUT FALL) vs TEMPERATURE 12 25 Tprop(f) -- Propagation Delay-- ns Tprop(f) -- Propagation Delay-- ns 11 PROPAGATION DELAY (SYNC FALL TO OUTPUT RISE) vs TEMPERATURE 10 9 8 7 20 15 10 6 5 5 --50 --25 0 25 50 75 100 125 --50 --25 Tj -- Temperature -- °C 25 50 75 100 125 Tj -- Temperature -- °C Figure 15 Figure 16 OSCILLATOR DISCHARGE ON-RESISTANCE vs TEMPERATURE CURRENT SENSE THRESHOLD
PAGE 16
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 TYPICAL CHARACTERISTICS SUPPLY CURRENT vs OSCILLATOR FREQUENCY (NO LOAD) SUPPLY CURRENT vs OSCILLATOR FREQUENCY (1 nF LOADS) 4.0 18 16 3.5 IDD -- Supply Current -- mA IDD -- Supply Current -- mA VDD = 14 V 3.0 2.5 VDD = 12 V 2.0 VDD = 9 V 14 VDD = 14 V 12 10 8 VDD = 12 V 6 VDD = 9 V 4 1.5 2 1.
PAGE 17
UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 REFERENCES 1. Power Supply Seminar SEM--1300 Topic 1: Unique Cascaded Power Converter Topology for High Current Low Output Voltage Applications, by L. Balogh, C. Bridge and B. Andreycak, Texas Instruments Literature No. SLUP133 2. Low Cost Inverter Suitable for Medium-Power Fuel Cell Sources, by P.T. Krein and R Balog, IEEE Power Electronics Specialists Conference Proceedings, 2002, vol. 1, pp. 321--326. 3.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device UCC28089DR Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.4 B0 (mm) K0 (mm) P1 (mm) 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC28089DR SOIC D 8 2500 367.0 367.0 35.
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