TI PMP1139912V 300W PMBus总线电源系统方案

TI公司的PMP11399是基于TPS548D22降压转换器的12V/ 300W PMBus总线电源系统,具有九个点负载降压转换器,主要用于3个ASIC/FPGA核,DDR3核存储器,VTT终端,以及高性能以太网交换机的辅助电源.本文介绍了TPS548D22主要特性和功能框图,PMBus电源系统PMP11399主要特性,电路图,材料清单和PCB元件布局图.
The TPS548D22 device is a compact single buck converter with adaptive on-time, D-CAP3 mode control. It is designed for high accuracy, high efficiency, fast transient response, ease-of-use, low external component count and space-conscious power systems.
This device features full differential sense, TI integrated FETs with a high-side on-resistance of 2.9 mΩ and a low-side on-resistance of 1.2 mΩ. The device also features accurate 0.5%, 0.9-V reference with an ambient temperature range between –40℃ and 125℃. Competitive features include: very low external component count, accurate load regulation and line regulation, auto-skip or FCCM mode operation, and internal soft-start control.
The TPS548D22 device is available in 5 mm × 7 mm, 40-pin, LQFN-CLIP (RVF) package (RoHs exempt).
TPS548D22主要特性:
Conversion Input Voltage Range (PVIN): 1.5 V to 16 V
Input Bias Voltage (VDD) Range: 4.5 V to 22 V
Output Voltage Range: 0.6 V to 5.5 V
Integrated, 2.9-mΩ and 1.2-mΩ Power MOSFETs with 40-A Continuous Output Current
Voltage Reference 0.6 V to 1.2 V in 50 mV Steps Using VSEL Pin
±0.5%, 0.9-VREF Tolerance Range: –40℃ to 125℃ Junction Temperature
True Differential Remote Sense Amplifier
D-CAP3™ Control Loop to Support Large Bulk Capacitors and/or Small MLCCs Without External Compensation
Adaptive On-Time Control with 4 Selectable Frequency Settings: 425 kHz, 650 kHz, 875 kHz, and 1.05 MHz
Temperature Compensated and Programmable Current Limit with RILIM and OC Clamp
Choice of Hiccup or Latch-Off OVP or UVP
VDD UVLO External Adjustment by Precision EN Hysteresis
Prebias Startup Support
Eco-mode™ and FCCM Select...