ZHCSPJ2A December 2021 – May 2022 TPS7A13
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
-
8 Application and Implementation
- 8.1
Application Information
- 8.1.1 Recommended Capacitor Types
- 8.1.2 Input, Output, and Bias Capacitor Requirements
- 8.1.3 Dropout Voltage
- 8.1.4 Behavior During Transition From Dropout Into Regulation
- 8.1.5 Device Enable Sequencing Requirement
- 8.1.6 Load Transient Response
- 8.1.7 Undervoltage Lockout Circuit Operation
- 8.1.8 Power Dissipation (PD)
- 8.1.9 Estimating Junction Temperature
- 8.1.10 Recommended Area for Continuous Operation
- 8.2 Typical Application
- 8.1
Application Information
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
8.1.7 Undervoltage Lockout Circuit Operation
The VIN UVLO circuit makes sure that the device remains disabled before the input supply reaches the minimum operational voltage range. The VIN UVLO circuit also makes sure that the device shuts down when the input supply collapses. Similarly, the VBIAS UVLO circuit makes sure that the device stays disabled before the bias supply reaches the minimum operational voltage range. The VBIAS UVLO circuit also makes sure that the device shuts down when the bias supply collapses.
Figure 8-2 depicts the UVLO circuit response to various input or bias voltage events. The diagram can be separated into the following parts:
- Region A: The output remains off while either the input or bias voltage is below the UVLO rising threshold
- Region B: Normal operation, regulating device
- Region C: Brownout event above the UVLO falling threshold (UVLO rising threshold – UVLO hysteresis). The output may fall out of regulation but the device is still enabled.
- Region D: Normal operation, regulating device
- Region E: Brownout event below the UVLO falling threshold. The device is disabled in most cases and the output falls as a result of the load and active discharge circuit. The device is re-enabled when the UVLO rising threshold is reached and a normal start up follows.
- Region F: Normal operation followed by the input or bias falling to the UVLO falling threshold
- Region G: The device is disabled when either the input or bias voltage falls below the UVLO falling threshold to 0 V. The output falls as a result of the load and active discharge circuit.
Figure 8-2 Typical VIN or VBIAS UVLO Circuit Operation