ZHCSUE4 August 2024 LMR51606-Q1 , LMR51610-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 Detailed Description
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Custom Design With WEBENCH® Tools
- 8.2.2.2 Output Voltage Setpoint
- 8.2.2.3 Switching Frequency
- 8.2.2.4 Inductor Selection
- 8.2.2.5 Output Capacitor Selection
- 8.2.2.6 Input Capacitor Selection
- 8.2.2.7 Bootstrap Capacitor
- 8.2.2.8 Undervoltage Lockout Setpoint
- 8.2.2.9 Replacing Non Sync Buck Converter
- 8.2.3 Application Curves
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
7.3.3 Enable
The voltage on the EN pin controls the ON and OFF operation of the LMR516xx-Q1. A voltage of less than 1V (typical) shuts down the device, while a voltage of greater than 1.227V (typical) is required to start the converter. The EN pin is an input and cannot be left open or floating. The simplest way to enable the operation of the LMR516xx-Q1 is to connect EN to VIN. This connection allows self-start-up of the LMR516xx-Q1 when VIN is within the operating range.
Many applications benefit from the employment of an enable divider, RENT and RENB (Figure 7-3) to establish a precision system UVLO level for the converter. A system UVLO can be used for supplies operating from utility power as well as battery power. A system UVLO can be used for sequencing, make sure there is reliable operation, or supplying protection, such as a battery discharge level. An external logic signal can also be used to drive the EN input for system sequencing and protection.
Figure 7-3 System UVLO by Enable Divider