The UC3849 family of average current-mode controllers accurately accomplishes secondary side average current mode control. The secondary-side output voltage is regulated by sensing the output voltage and differentially sensing the ac switching current. The sensed output voltage drives a voltage error amplifier. The ac switching current, monitored by a current sense resistor, drives a high bandwidth, low offset current sense amplifier. The outputs of the voltage error amplifier and current sense amplifier differentially drive a high bandwidth, integrating current error amplifier. The sawtooth waveform at the current error amplifier output is the amplified and inverted inductor current sensed through the resistor. This inductor current down-slope compared to the PWM ramp achieves slope compensation, which gives an accurate and inherent fast transient response to changes in load.
UC2849 | UC3849 | |
Duty Cycle(Max)(%) | 85 | 85 |
Frequency(Max)(kHz) | 1000 | 1000 |
Pin/Package | 24PDIP, 24SOIC | 24SOIC |
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 |
UC3849DW | ACTIVE | 0 to 70 | 1.75 | 1ku | SOIC(DW) | 24 | 25 | TUBE | UC3849DW |
UC3849DWG4 | ACTIVE | 0 to 70 | 1.75 | 1ku | SOIC(DW) | 24 | 25 | TUBE | UC3849DW |
UC3849DWTR | ACTIVE | 0 to 70 | 1.70 | 1ku | SOIC(DW) | 24 | 2000 | LARGE T&R | UC3849DW |
UC3849DWTRG4 | ACTIVE | 0 to 70 | 1.70 | 1ku | SOIC(DW) | 24 | 2000 | LARGE T&R | UC3849DW |
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 |
UC3849DW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3849DW | |
UC3849DWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3849DWG4 | UC3849DWG4 |
UC3849DWTR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3849DWTR | |
UC3849DWTRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3849DWTRG4 | UC3849DWTRG4 |
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 |
UC3849 评估模块 | UC3849EVM | 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 |