ZHCSF29E May 2016 – January 2021 TPS25940-Q1
PRODMIX
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Parametric Measurement Information
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3 Feature Description
- 9.4 Device Functional Modes
-
10Application and Implementation
- 10.1 Application Information
- 10.2
Typical Application
- 10.2.1 Design Requirements
- 10.2.2
Detailed Design Procedure
- 10.2.2.1 Step by Step Design Procedure
- 10.2.2.2 Programming the Current-Limit Threshold: R(ILIM) Selection
- 10.2.2.3 Undervoltage Lockout and Overvoltage Set Point
- 10.2.2.4 Programming Current Monitoring Resistor—RIMON
- 10.2.2.5 Setting Output Voltage Ramp Time (tdVdT)
- 10.2.2.6 Programing the Power Good Set Point
- 10.2.2.7 Support Component Selections—R6, R7 and CIN
- 10.2.3 Application Curves
- 10.2.4 System Examples
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RVC|20
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RVC|20
訂購(gòu)信息
9.3.6 Current Monitoring
The current source at IMON terminal is configured to be proportional to the current flowing from IN to OUT. This current can be converted to a voltage using a resistor R(IMON) from IMON terminal to GND terminal. This voltage, computed using Equation 6, can be used as a means of monitoring current flow through the system.
The maximum voltage range for monitoring the current (V(IMONmax)) is limited to minimum([V(IN) – 2.2 V], 6 V) to ensure linear output. This puts limitation on maximum value of R(IMON) resistor and is determined by Equation 5.
The output voltage at IMON terminal is calculated from Equation 6.
where
- GAIN(IMON) = Gain factor I(IMON):I(OUT) = 52 μA/A
- I(OUT) = Load current
- I(IMON_OS) = 0.8 μA (typical)
This pin must not have a bypass capacitor to avoid delay in the current monitoring information.
The voltage at IMON pin can be digitized using an ADC (such as ADS1100, SBAS239) to read the current monitor information over an I2C bus.