UCC28089

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...