TI 公司的TPS54061是集成了高邊和低邊MOSFET的 60V 200mA同步降壓DC/DC轉換器,采用電流模式控制,簡化外部補償和靈活選擇元件,工作靜態(tài)電流90uA,關端電流1.4uA,開關頻率50kHz到1100kHz可調,主要用在4-20mA電流回路傳感器,工業(yè)過程控制,計量和安全系統(tǒng),高效地替代高壓線性穩(wěn)壓器.本文介紹了TPS54061主要特性,方框圖,CCM和DCM應用電路圖以及TPS54061EVM-142評估板電路圖,材料清單和PCB元件布局圖.
The TPS54061 device is a 60-V, 200-mA,synchronous step-down DC-DC converter with integrated high side and low side MOSFETs. Current mode control provides simple external compensation and flexible component selection. The non-switching supply current is 90 μA. Using the enable pin, shutdown supply current is reduced to 1.4 μA.
To increase light load efficiency the low side MOSFET emulates a diode when the inductor current reaches zero.
Under voltage lockout is internally set at 4.5 V, but can be increased using two resistors on the enable pin. The output voltage startup ramp is controlled by the internal slow start time.
The adjustable switching frequency range allows efficiency and external component size to be optimized. Frequency foldback and thermal shutdown protects the part during an overload condition.
The TPS54061 enables small designs by integrating the MOSFETs, boot recharge diode, and minimizing the IC footprint with a small 3mm x 3mm thermally enhanced VSON package
TPS54061主要特性:
• Integrated High Side and Low Side MOSFET
• Diode Emulation for Improved Light Load Efficiency
• Peak Current Mode Control
• 90 μA Operating Quiescent Current .
• 1.4 μA Shutdown Supply Current
• 50 kHz to 1100 kHz Adjustable Switching Frequency
• Synchronizes to External Clock
• Internal Slow Start
• 0.8 V ±1% Voltage Reference
• Stable with Ceramic Output Capacitors or Low Cost Aluminum Electrolytic
• Cycle-by-Cycle Current Limit, Thermal, OVP and Frequency Fold Back Protection
• VSON-8 Package, 3 mm X 3 mm With Thermal Pad
• –40℃ to 150℃ Operating Junction Temperature
TPS54061應用:
• 4-20 mA Current-Loop Powered Sensors
• Low Power Standby or Bias Voltage Supplies EFFICIENCY
• Industrial Process Control, Metering, and Security Systems
• High Efficiency Replacement for High Voltage Linear Regulators
圖1.TPS54061方框圖
圖2.TPS54061 CCM應用電路圖
圖3.TPS54061 DCM應用電路圖
圖4.TPS54061EVM-142評估板電路圖
TPS54061EVM-142評估板材料清單:
圖5.TPS54061EVM-142評估板元件布局圖 |
