ZHCSMS4B November 2020 – September 2021 TPS25864-Q1 , TPS25865-Q1
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 说明（续）
- 6 Device Comparison Table
- 7 Pin Configuration and Functions
- 8 Specifications
- 9 Parameter Measurement Information
-
10Detailed Description
- 10.1 Overview
- 10.2 Functional Block Diagram
- 10.3
Feature Description
- 10.3.1 Power-Down or Undervoltage Lockout
- 10.3.2 Input Overvoltage Protection (OVP) - Continuously Monitored
- 10.3.3 Buck Converter
- 10.3.4 FREQ/SYNC
- 10.3.5 Bootstrap Voltage (BOOT)
- 10.3.6 Minimum ON-Time, Minimum OFF-Time
- 10.3.7 Internal Compensation
- 10.3.8 Selectable Output Voltage (VSET)
- 10.3.9 Current Limit and Short Circuit Protection
- 10.3.10 Cable Compensation
- 10.3.11 Thermal Management With Temperature Sensing (TS) and OTSD
- 10.3.12 Thermal Shutdown
- 10.3.13 USB Specification Overview
- 10.3.14 USB Port Operating Modes
- 10.4 Device Functional Modes
- 11Application and Implementation
- 12Power Supply Recommendations
- 13Layout
- 14Device and Documentation Support
- 15Mechanical, Packaging, and Orderable Information
10.3.11 Thermal Management With Temperature Sensing (TS) and OTSD
The TS input pin allows for user-programmable thermal protection (for the TS pin thresholds, see the Electrical Characteristics section). The TS input pin threshold is ratiometric with VSENSE. The external resistor divider setting, VTS, must be connected to the TPS2586x-Q1 SENSE pin to achieve accurate results (refer to the Figure 10-10).
Figure 10-10 TS InputIf the overtemperature condition happens, causing VTS = 0.65 × VSENSE, the TPS2586x-Q1 reduces the BUCK regulator output voltage to 4.77 V.
If the Overtemperature condition persists, causing TJ to reach the OTSD threshold, then the device thermal shuts down.
The NTC thermistor must be placed near the hottest point on the PCB. In most cases, this placement is close to the SW node of the TPS2586x-Q1, near the buck inductor.