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UCC28089 Datasheet

  • UCC28089

  • 具有死区时间控制的初级侧推挽驱动器

  • 467.73KB

  • 20页

  • TI

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UCC28089
SLUS623 鈭?SEPTEMBER 2004
PRIMARY-SIDE PUSH-PULL OSCILLATOR
WITH DEAD-TIME CONTROL
FEATURES
D
Push-Pull Oscillator With Programmable
D
D
D
D
D
D
D
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
碌A
and 1.4-mA
Typical Run Current
Over-Current Shutdown
Digitally Controlled Over-Current/Retry
Feature
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 using a
toggle flip-flop and duty cycle is limited to less than 50%.
TYPICAL APPLICATION
+
VIN = 48 V
VO = 1.2 V
+
鈭?/div>
RA
鈭?/div>
UCC28089
1 SYNC VDD 8
2 DIS
RB
BIAS
OUTA 7
OUTB 6
GND 5
UCC2540
G1 18
2 REF
VDD 16
PGND 15
4 SYNCIN G2 14
3 CT
4 CS
CT
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

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