ZHCSCO8E June 2014 – May 2019 TPS65283 , TPS65283-1
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 典型電路原理圖
- 5 修訂歷史記錄
- 6 說(shuō)明 （續(xù)）
- 7 Pin Configuration and Functions
- 8 Specifications
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Power Switch Detailed Description
- 9.3.2
Buck DC-DC Converter Detailed Description
- 9.3.2.1 Output Voltage
- 9.3.2.2 Adjustable Switching Frequency
- 9.3.2.3 Synchronization
- 9.3.2.4 Error Amplifier
- 9.3.2.5 Slope Compensation
- 9.3.2.6 Enable and Adjusting UVLO
- 9.3.2.7 Internal V7V Regulator
- 9.3.2.8 Short Circuit Protection
- 9.3.2.9 Bootstrap Voltage (BST) and Low Dropout Operation
- 9.3.2.10 Output Overvoltage Protection (OVP)
- 9.3.2.11 Power Good
- 9.3.2.12 Power-Up Sequencing
- 9.3.2.13 Thermal Performance
- 9.4 Device Functional Modes
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13器件和文檔支持
- 14機(jī)械、封裝和可訂購(gòu)信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RGE|24
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RGE|24
訂購(gòu)信息
9.3.2.8.2 Low-Side MOSFET Overcurrent Protection
While the low-side MOSFET is turned on, its conduction current is monitored by the internal circuitry. During normal operation, the low-side MOSFET sources current to the load. At the end of every clock cycle, the low-side MOSFET sourcing current is compared to the internally-set low-side sourcing current limit. If the low-side sourcing current is exceeded, the high-side MOSFET is not turned on and the low-side MOSFET stays on for the next cycle. The high-side MOSFET is turned on again when the low-side current is below the low-side sourcing current limit at the start of a cycle.
The low-side MOSFET may also sink current from the load. If the low-side sinking current limit is exceeded, the low-side MOSFET is turned off immediately for the rest of that clock cycle. In this scenario, both MOSFETs are off until the start of the next cycle.
Furthermore, if an output overload condition (as measured by the COMP pin voltage) has lasted for more than the hiccup wait time, which is programmed for 4 ms, the device shuts down and restarts after the hiccup time of 64 ms. The hiccup mode helps to reduce the device power dissipation under severe overcurrent conditions
Figure 28. DC-DC Overcurrent Protection