ZHCSB15B May 2013 – October 2023 TPS54531
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Fixed-Frequency PWM Control
- 7.3.2 Voltage Reference (Vref)
- 7.3.3 Bootstrap Voltage (BOOT)
- 7.3.4 Enable and Adjustable Input Undervoltage Lockout (VIN UVLO)
- 7.3.5 Programmable Slow Start Using SS Pin
- 7.3.6 Error Amplifier
- 7.3.7 Slope Compensation
- 7.3.8 Current-Mode Compensation Design
- 7.3.9 Overcurrent Protection and Frequency Shift
- 7.3.10 Overvoltage Transient Protection
- 7.3.11 Thermal Shutdown
- 7.4 Device Functional Modes
-
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 Switching Frequency
- 8.2.2.3 Output Voltage Set Point
- 8.2.2.4 Undervoltage Lockout Set Point
- 8.2.2.5 Input Capacitors
- 8.2.2.6 Output Filter Components
- 8.2.2.7 Compensation Components
- 8.2.2.8 Bootstrap Capacitor
- 8.2.2.9 Catch Diode
- 8.2.2.10 Slow-Start Capacitor
- 8.2.2.11 Output Voltage Limitations
- 8.2.2.12 Power Dissipation Estimate
- 8.2.3 Application Curves
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
5 Pin Configuration and Functions
Figure 5-1 DDA Package,8-Pin SO With PowerPAD™
Integrated Circuit PackageTop
ViewTable 5-1 Pin Functions
| PIN | TYPE(1) | DESCRIPTION | |
|---|---|---|---|
| NO. | NAME | ||
| 1 | BOOT | O | A 0.1-μF bootstrap capacitor is required between the BOOT and PH pins. If the voltage on this capacitor falls below the minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is refreshed. |
| 2 | VIN | I | This pin is the 3.5- to 28-V input supply voltage. |
| 3 | EN | I | This pin is the enable pin. To disable, pull below 1.25 V. Float this pin to enable. Programming the input undervoltage lockout with two resistors is recommended. |
| 4 | SS | I | This pin is slow-start pin. An external capacitor connected to this pin sets the output rise time. |
| 5 | VSENSE | I | This pin is the inverting node of the transconductance (gm) error amplifier. |
| 6 | COMP | O | This pin is the error-amplifier output and the input to the PWM comparator. Connect frequency compensation components to this pin. |
| 7 | GND | — | Ground pin |
| 8 | PH | O | The PH pin is the source of the internal high-side power MOSFET. |
| 9 | PowerPAD integrated circuit package | — | For proper operation, the GND pin must be connected to the exposed pad. |
(1) I = input, O = output