ZHCSMA7D January 2022 – April 2024 TPS4811-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Device Comparison Table
- 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 Charge Pump and Gate Driver output (VS, PU, PD, BST, SRC)
- 8.3.2 Capacitive Load Driving
- 8.3.3 Short-Circuit Protection
- 8.3.4 Short-Circuit Protection
- 8.3.5 Analog Current Monitor Output (IMON)
- 8.3.6 Overvoltage (OV) and Undervoltage Protection (UVLO)
- 8.3.7 Device Functional Mode (Shutdown Mode)
- 8.3.8 Remote Temperature sensing and Protection (DIODE)
- 8.3.9 Output Reverse Polarity Protection
- 8.3.10 TPS4811x-Q1 as a Simple Gate Driver
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Revision History
- 12Mechanical, Packaging, and Orderable Information
8.3.8 Remote Temperature sensing and Protection (DIODE)
The device features an integrated remote temperature sensing, protection and dedicated fault output. In TPS4811x-Q1, remote temperature measurement is done by using external transistor in diode configuration. Connect the DIODE pin of TPS4811x-Q1 to the collector and base of an MMBT3904 BJT. The temperature is calculated internally based on difference of measured diode voltages at two test currents.
In TPS48110-Q1, after the sensed temperature reaches 150ºC, the device pulls PD low to SRC, turning off the external FET and asserts FLT_T low. After the temperature reduces to 130ºC, an internally fixed auto-retry cycle of 512 ms commences. FLT_T de-asserts and the external FET turns ON after the retry duration of 512 ms is lapsed.
In TPS48111-Q1, after the sensed temperature crosses 150°C, PD and G get pulled low to SRC. After the TSD hysteresis, PU and G stays latched OFF. Latch gets reset by toggling EN/UVLO below V(ENF) or by power cycling VS below V(VS_PORF).
Figure 8-13 shows simplified block diagram of TPS4811x-Q1 DIODE based remote temperature sensing.
Figure 8-13 DIODE based Remote Temperature Sensing Block Diagram