LTC7060

演示电路DC2886A是一款大功率、高效同步六相双电流转换器，内置LTC7871和LTC7060。根据功率流的方向，标记 V_HIGH 和 V_LOW 的端子是输入或输出。当SW1开关处于降压挡位时，V_LOW 提供 14 V 输出，而 V_HIGH 是输入，范围为30V至70V。当开关处于升压挡位时，V_HIGH 提供48V输出，而 V_LOW 是输入，范围为10V至14V。两个方向上，最大 V_LOW 电流均为180 A。在输入电压范围内以降压方式工作时，最大输出功率是2.5 kW。当输入电压为14 V，以升压方式工作时，最大输出功率是2.4 kW。以最大功率运行时，需要外部气流。MOSFET的每相都由LTC7060半桥驱动器驱动。每个LTC7060栅极驱动器都放置在MOSFET旁边，并从LTC7871接收PWM信号。

使用具有低功耗的高精度AC/DC电流感测架构，通过一个1mΩ的低感测电阻来检测每相的电感器电流。LTC7871的恒定电流环路根据BUCK引脚状态，为流入或流出的 V_LOW 端子电流提供了DC电流限制。此电流可由SETCUR引脚进行编程，并由IMON引脚进行监控。

DC2886A提供SPI兼容的串行端口。借助主机上的 DC2026C (Linduino^® One) 演示板以及 QuikEval^™ 软件，用户可以：

• 将调节后的 V_LOW 或 V_HIGH 上调或下调。
• 用SETCUR引脚使DC限流值上调或下调。
• 启用扩频后，调整扩频电路的频率扩展和调制速率。
• 监控LTC7871的运行状态和故障。

DC2886A 的其他特性包括：

• 引脚可选的轻负载工作模式
  • 降压：FCM，跳脉冲和突发工作模式^® 运行
  • 升压：FCM和跳脉冲
• SYNC和CLKOUT引脚
• 可选跳线，实现扩频调制
• RUN、FAULT、PGOOD和PWNEN引脚
• BUCK引脚从外部控制功率流的方向
• 可选散热器的尺寸

The evaluation board EVAL-LTC7872-AZ is a high power, high efficiency, four-phase bidirectional converter featuring the LTC7872 and LTC7060. The terminals labeled V_HIGH and V_LOW are either inputs or outputs depending on the direction of power flow. When the switch SW1 is set to the BUCK position, V_LOW provides a 14V output and V_HIGH is the input with a range of 30V to 75V with a maximum load current of 120A. When the switch SW1 is in the BOOST position, V_HIGH provides a 48V output and V_LOW is the input with a range of 10V to 14V with a maximum load current of 34A at a 14V input voltage. The maximum I_LOW current is 120A in both directions. The maximum output power is 1.7kW when operating as a buck within the input voltage range. When operating as a boost, the maximum output power is 1.6kW when the input voltage is 14V. External airflow is required when operating at maximum power in either direction of power flow. The MOSFETs in each phase are driven by the LTC7060 half-bridge driver.

The inductor current for each phase is sensed with a low 1mΩ sense resistor using a highly accurate AC/DC current-sensing architecture with low power dissipation. The LTC7872’s constant-current loop provides a DC current limit for the current flowing in or out of the V_LOW terminal depending on the state of the BUCK pin. This current can be programmed with the SETCUR pin and monitored with the IMON pin.