LM3812中文资料Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output数据手册TI规格书

描述 Description

General Description
The LM3812/LM3813 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004Ω). The LM3812 is used for high-side sensing and the LM3813 is used for low-side sensing. A Delta Sigma analog to digital converter is incorporated to precisely measure the current and to provide a current averaging function. Current is averaged over 50 msec time peri
ods in order to provide immunity to current spikes. The ICs have a pulse-width modulated (PWM) output which indicates the current magnitude and direction. The shutdown pin can be used to inhibit false triggering during start-up, or to enter a low quiescent current mode. The LM3812 and LM3813 are factory-set in two different current options. The sense range is −1A to +1A or −7A to +7A. The sampling interval for these parts is 50ms. If faster sampling is desired, please refer to the data sheets for the part numbers LM3814 and LM3815.

特性 Features

No external sense element required
PWM output indicates the current magnitude and direction
PWM output can be interfaced with microprocessors
Precision∆Σcurrent-sense technique
Low temperature sensitivity
Internal filtering rejects false trips
Internal Power-On-Reset (POR)