UCC28231 - 适用于总线转换器的高级 PWM 控制器，具有 3.3V 精密电压基准

UCC28231是TI德州仪器公司的一款PWM与谐振控制器产品，UCC28231是适用于总线转换器的高级 PWM 控制器，具有 3.3V 精密电压基准，本站介绍了UCC28231的封装应用图解、特点和优点、功能等，并给出了与UCC28231相关的TI元器件型号供参考。

UCC28231 - 适用于总线转换器的高级 PWM 控制器，具有 3.3V 精密电压基准 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UCC28230, UCC28231 PWM bus controllers are optimized for use in high efficiency, high power density, unregulated intermediate bus converters. Topologies include push-pull, half-bridge and full-bridge. External drivers, such asthe UCC27200 120-V high-side/low-side drivers, can be used with this controller.

Low cost, small size and highly efficient solutions are provided by innovations such as:

Start-up frequency control circuit allowing small output inductor andthe ability to start with large intermediate bus capacitor. Load depended off-time control set by user.

Additional 1-D control outputs can be used for primary winding clamping in self-driven output synchronous rectifier applications or as drive signals for the control-driven synchronous rectifier.

Cycle-by-cycle current limit prevents overstresses of converter. If the over current condition causes less than 80% duty cycle at the output, then after a programmed time the controller proceeds into periodical shutdown and restart hiccup mode.

The UCC28230 provides 5 V, and the UCC28231 provides 3.3-V precision reference voltages with 1.5% overall accuracy and 10-mA output current. This reference voltage can be used to supply housekeeping circuit and/or microcontroller. The precision reference voltage can also be used for accurate setting of system parameters.

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 by an external resistor.

产品特性

Programmable, Load Depended Off Time Control
Frequency Controlled Start Up Allows Small Output Inductor, Low Ripple and Constant Current Start with Large Output Capacitor
Two 0.2-A Push-Pull Outputs Provide Matched Control Signals D to External Drivers
Two Additional 1- D Outputs for Optimal Use of Self-Driven or Control Driven Synchronous Rectifiers
Unregulated, Fixed Volt-Second or Fixed Frequency Modes set by User
Two, 1.5% Overall Accuracy Reference Voltage Options: 5-V for UCC28230 and 3.3-V for UCC28231
Resistor Programmable Switching Frequency up to 1 MHz
Cycle-by-Cycle Current Limit Allows Parallel Operation with Droop Based Current Sharing
Single External Capacitor sets Soft-Start and Over Current Hiccup Mode Parameters with Restart
Severe Short Circuit Hiccup with Restart or Latch Off Protection Option by External Resistor
Input Under Voltage Lock Out
Thermal Shutdown
Thermally Enhanced 3 mm × 2 mm SON-12 and TSSOP-14 Package Options
APPLICATIONS
- Intermediate Bus Isolated Converters
- DC-to-DC Transformers

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