The UCC3888 controller is optimized for use as an off-line, low-power, low-voltage, regulated bias supply. The unique circuit topology utilized in this device can be visualized as two cascaded flyback converters, each operating in the discontinuous mode, both driven from a single external power switch. The significant benefit of this approach is the ability to achieve voltage conversion ratios as high as 400 V to 2.7 V with no transformer and low internal losses.
The control algorithm utilized by the UCC3888 sets the switch on time inversely proportional to the input line voltage and sets the switch off time inversely proportional to the output voltage. This action is automatically controlled by an internal feedback loop and reference.
| UCC2888 | UCC3888 | |
| Topology | Flyback | Flyback |
| Control Method | Voltage Mode | Voltage Mode |
| Duty Cycle(Max)(%) | 55 | 55 |
| Frequency(Max)(kHz) | 250 | 250 |
| UVLO Thresholds On/Off(V) | 8.4/6.3 | 8.4/6.3 |
| Pin/Package | 8SOIC | 8PDIP, 8SOIC |
| Regulated Outputs(#) | 1 | 1 |
| Operating Temperature Range(°C) | -40 to 85 | 0 to 70 |
| Rating | Catalog | Catalog |
| 器件 | 状态 | 温度 (oC) | 价格（美元） | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| UCC2888D | ACTIVE | -40 to 105 | 0.35 | 1ku | SOIC (D) | 8 | 75 | TUBE | 28811D |
| UCC2888DG4 | ACTIVE | -40 to 105 | 0.35 | 1ku | SOIC (D) | 8 | 75 | TUBE | 28811D |
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| UCC2888D | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | UCC2888D | |
| UCC2888DG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | UCC2888DG4 | UCC2888DG4 |
| 名称 | 型号 | 公司 | 工具/软件类型 |
| 音频的快速搜索选择工具 | AUDIO_SELECTION_TOOL | Texas Instruments | 免费评估工具 |
| UCC2888 评估模版 | UCC2888EVM | Texas Instruments | 开发电路板/EVM |
| 用于音频转换器的软件驱动程序 | CODECDRIVERS-SW | Texas Instruments | 应用软件 |
