ZHCSMA7D January 2022 – April 2024 TPS4811-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)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
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DGX|19
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購(gòu)信息
8.3.3.1 Overcurrent Protection With Auto-Retry
The CTMR programs the over current protection delay (tOC) and auto-retry time (tRETRY). Once the voltage across CS+ and CS– exceeds the set point, the CTMR starts charging with 80-μA pull-up current. After the CTMR charges up to V(TMR_FLT), FLT asserts low providing warning on impending FET turn OFF. After CTMR charges to V(TMR_OC), PD pulls low to SRC turning OFF the FET. Post this event, the auto-retry behavior starts. The CTMR capacitor starts discharging with 2.5-uA pulldown current. After the voltage reaches V(TMR_LOW) level, the capacitor starts charging with 2.5-uA pullup. After 32 charging-discharging cycles of CTMR the FET turns ON back and FLT de-asserts
Use Equation 7 to calculate the CTMR capacitor to be connected across TMR and GND.
Where, ITMR is internal pull-up current of 80-μA, tOC is desired overcurrent response time.
The fastest tOC is < 6 μs with no CTMR cap connected.
tRETRY = 22.7 × 106 × CTMR
If the overcurrent pulse duration is below tOC then the FET remains ON and CTMR gets discharged using internal pull down switch.
Figure 8-9 Overcurrent Protection With Auto-Retry