ZHCSNE6 August 2021 TPS1653
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Parameter Measurement Information
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Hot Plug-In and In-Rush Current Control
- 8.3.2 Undervoltage Lockout (UVLO)
- 8.3.3 Overload and Short Circuit Protection
- 8.3.4 Current Monitoring Output (IMON)
- 8.3.5 FAULT Response (FLT)
- 8.3.6 Power Good Output (PGOOD)
- 8.3.7 IN, P_IN, OUT and GND Pins
- 8.3.8 Thermal Shutdown
- 8.3.9 Low Current Shutdown Control (SHDN)
- 8.3.10 Enable Input (EN)
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
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8.3.4 Current Monitoring Output (IMON)
The TPS16530 device features an accurate analog current monitoring output. A current source at IMON terminal is internally configured to be proportional to the current flowing from IN to OUT. This current can be converted into a voltage using a resistor R(IMON) from IMON terminal to GND terminal. The IMON voltage can be used as a means of monitoring current flow through the system. The maximum voltage (V(IMONmax) for monitoring the current is limited to 4 V. This limit puts a limitation on maximum value of R(IMON) resistor and is determined by Equation 5.
Where,
- GAIN(IMON) is the gain factor I(IMON):I(OUT) = 27.9 μA/A (typical)
- I(OUT) is the load current
See Figure 6-5 for IMON gain versus load current (0.01 to 4.5 A) and Figure 6-6 for IMON Offset versus Temperature plots. Figure 6-6 illustrates IMON performance.
Figure 8-7 IMON Response During a Load
StepThe IMON pin must not have a bypass capacitor to avoid delay in the current monitoring information.