ZHCSOF5A May 2022 – September 2022 TPS25985
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 说明（续）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Undervoltage Protection
- 8.3.2 Insertion Delay
- 8.3.3 Overvoltage Protection
- 8.3.4 Inrush Current, Overcurrent, and Short-Circuit Protection
- 8.3.5 Analog Load Current Monitor (IMON)
- 8.3.6 Mode Selection (MODE)
- 8.3.7 Parallel Device Synchronization (SWEN)
- 8.3.8 Stacking Multiple eFuses for Unlimited Scalability
- 8.3.9 Analog Junction Temperature Monitor (TEMP)
- 8.3.10 Overtemperature Protection
- 8.3.11 Fault Response and Indication (FLT)
- 8.3.12 Power Good Indication (PG)
- 8.3.13 Output Discharge
- 8.3.14 General Purpose Comparator
- 8.3.15 FET Health Monitoring
- 8.3.16 Single Point Failure Mitigation
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.5 Analog Load Current Monitor (IMON)
The TPS25985x allows the system to monitor the output load current accurately by providing an analog current on the IMON pin which is proportional to the current through the FET. The benefit of having a current output is that the signal can be routed across a board without adding significant errors due to voltage drop or noise coupling from adjacent traces. The current output also allows the IMON pins of multiple TPS25985x devices to be tied together to get the total current in a parallel configuration. The IMON signal can be converted to a voltage by dropping it across a resistor at the point of monitoring. The user can sense the voltage (VIMON) across the RIMON to get a measure of the output load current using Equation 13.
The TPS25985x IMON circuit is designed to provide high bandwidth and high accuracy across load and temperature conditions, irrespective of board layout and other system operating conditions. This design allows the IMON signal to be used for advanced dynamic platform power management techniques such as Intel PSYS or PROCHOT# to maximize system power usage and platform throughput without sacrificing safety or reliability.
Figure 8-6 Analog Load Current Monitor ResponseThe IMON pin provides load current monitoring information only during steady-state. During inrush, the IMON pin reports zero load current.
- The ILIM pin reports the individual device load current at all times and can also be used as an analog load current monitor for each individual device.
- Care must be taken to minimize parasitic capacitance on the IMON and ILIM pins to avoid any impact on the overcurrent and short-circuit protection timing.