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UCC28230PWTIN/a5avaiAdvanced PWM Controller for Bus Converters with 5V Precision Reference Voltage 14-TSSOP -55 to 125
UCC28230PWRTIN/a550avaiAdvanced PWM Controller for Bus Converters with 5V Precision Reference Voltage 14-TSSOP -55 to 125


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UCC28230PW-UCC28230PWR
Advanced PWM Controller for Bus Converters with 5V Precision Reference Voltage
1FEATURES
DESCRIPTION
APPLICATIONS
UCC28230
UCC28231
www.ti.com...................................................................................................................................................
SLUS814A–FEBRUARY 2008–REVISED JUNE 2008
Advanced PWM Controller for Bus Converters
Programmable, Load Depended Off Time
Control
The UCC28230, UCC28231 PWM bus controllers are
optimized for use in high efficiency, high power• Frequency Controlled Start Up Allows Small
density, unregulated intermediate bus converters.Output Inductor, Low Ripple and Constant
Topologies include push-pull, half-bridge andCurrent Start with Large Output Capacitor full-bridge. External drivers, such as the UCC27200• Two 0.2-A Push-Pull Outputs Provide Matched 120-V high-side/low-side drivers, can be used withControl SignalsDto External Drivers this controller.• Two Additional1-D Outputs for Optimal Use Low cost, small size and highly efficient solutions areof Self-Drivenor Control Driven Synchronous providedby innovations such as:Rectifiers • Start-up frequency control circuit allowing small• Unregulated, Fixed Volt-Secondor Fixed output inductor and the abilityto start with largeFrequency Modes set by User intermediate bus capacitor. Two, 1.5% Overall Accuracy Reference Voltage • Load depended off-time control setby user.
Options: 5-V for UCC28230 and 3.3-V for
Additional 1-D control outputs can be used forUCC28231 primary winding clamping in self-driven output• Resistor Programmable Switching Frequency synchronous rectifier applicationsor as drive signalsto1 MHz for the control-driven synchronous rectifier. Cycle-by-Cycle Current Limit Allows Parallel Cycle-by-cycle current limit prevents overstressesofOperation with Droop Based Current Sharing converter.If the over current condition causes less
than 80% duty cycle at the output, then aftera• Single External Capacitor sets Soft-Start and
programmed time the controller proceeds intoOver Current Hiccup Mode Parameters with periodical shutdown and restart hiccup mode.Restart
The UCC28230 provides5 V, and the UCC28231• Severe Short Circuit Hiccup with Restartor
provides 3.3-V precision reference voltages with 1.5%Latch Off Protection Option by External overall accuracy and 10-mA output current. ThisResistor reference voltage can be used to supply• Input Under Voltage Lock Out housekeeping circuit and/or microcontroller. The• Thermal Shutdown precision reference voltage can also be used for
accurate settingof system parameters.• Thermally Enhanced3 mm×2 mm SON-12
and TSSOP-14 Package Options
Other features include under-voltage lockout, thermal
shut down, programmable soft start, over-current
hiccup mode and short circuit protection with internal
restart by default that can be set into latch-off mode• Intermediate Bus Isolated Convertersan external resistor.• DC-to-DC Transformers
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