NS LM5066 PMBus接口高压系统电源管理和保护方案

NS公司的LM5066是带PMBus兼容的SMBus/I2C接口的高压系统电源管理和保护器件,可以精确测量,保护和控制连接到背板电源总线的系统的电工作状态.输入电压范围10V-80V,可编程的26mV或50mV限流阈值,能以12位分辨率和1kHz取样速率实时监视VIN, VOUT, IIN, PIN, VAUX,可配置电路断路器保护和欠压和过压保护,遥测温度,电源测量精度±4.5%,主要用在服务器背板系统,基站电源分布系统和固态电路断路器.本文介绍了LM5066主要特性,方框图, 典型应用电路图和指令/寄存器和告警流程图.

High Voltage System Power Management and Protection IC with PMBus

The LM5066 combines a high performance hot swap controller with a PMBus™ compliant SMBus/I2C interface to accurately measure, protect and control the electrical operating conditions of systems connected to a backplane power bus.

The LM5066 continuously supplies real-time power, voltage, current, temperature and fault data to the system management host via the SMBus interface.

The LM5066 control block includes a unique hot swap architecture that provides current and power limiting to protect sensitive circuitry during insertion of boards into a live system backplane, or any other "hot" power source. A fast acting circuit breaker prevents damage in the event of a short circuit on the output. The input under-voltage and over-voltage levels and hysteresis are configurable, as well as the insertion delay time and fault detection time. A temperature monitoring block on the LM5066 interfaces with a low-cost external diode for monitoring the temperature of the external MOSFET or other thermally sensitive components. The PGD output provides a fast indicator when the input and/or output voltages are outside their programmed ranges. LM5066 current measurement accuracy is ±4.5% over the operating temperature range.

The LM5066 monitoring block computes both the real-time and average values of subsystem operating parameters (VIN, IIN, PIN, VOUT) as well as the peak power. Accurate power averaging is accomplished by averaging the product of the input voltage and current. A black box (Telemetry/Fault Snapshot) function captures and stores telemetry data and device status in the event of a warning or a fault.

LM5066主要特性:

■ Input voltage range: 10V to 80V

■ Programmable 26 mV or 50 mV Current Limit Threshold with Power Limiting (MOSFET Power Dissipation Limiting)

■ Real time monitoring of VIN, VOUT, IIN, PIN, VAUX with 12-bit resolution and 1 kHz sampling rate

■ Configurable Circuit Breaker protection for hard shorts

■ Configurable Under-Voltage and Over-Voltage protection

■ Remote temperature sensing with programmable warning and shutdown thresholds

■ Detection and notification of damaged MOSFET condition

■ Power measurement accuracy: ±4.5% over temperature

■ True Input Power averages dynamic power readings

■ Averaging of VIN, IIN, PIN, and VOUT over programmable interval ranging from 0.001 to 4 seconds

■ Programmable WARN and FAULT thresholds with SMBA notification

■ Black box capture of telemetry measurements and device status triggered by WARN or FAULT condition

■ I2C/SMBus interface and PMBus compliant command structure

■ Full featured application development software

■ eTSSOP-28 package

LM5066应用:

■ Server Backplane Systems

■ Base Station Power Distribution Systems

■ Solid State Circuit Breaker

图1.LM5066方框图

图2.LM5066典型应用电路图

图3.推荐的LM5066板连接器设计框图

图4.LM5066指令/寄存器和告警流程图
详情请见:
http://www.national.com/ds/LM/LM5066.pdf