ZHCSSP5D January 2009 – September 2023 TPS54332
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 the 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 Input Capacitors
- 8.2.2.5 Output Filter Components
- 8.2.2.6 Inductor Selection
- 8.2.2.7 Capacitor Selection
- 8.2.2.8 Compensation Components
- 8.2.2.9 Bootstrap Capacitor
- 8.2.2.10 Catch Diode
- 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 PowerPAD™ Integrated Circuit Package (Top View)Table 5-1 Pin Functions
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| BOOT | 1 | O | A 0.1-μF bootstrap capacitor is required between BOOT and PH. 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. |
| VIN | 2 | I | Input supply voltage, 3.5 V to 28 V. |
| EN | 3 | I | Enable pin. Pull below 1.25 V to disable. Float to enable. TI recommends programming the input undervoltage lockout with two resistors. |
| SS | 4 | I | Slow-start pin. An external capacitor connected to this pin sets the output rise time. |
| VSENSE | 5 | I | Inverting node of the gm error amplifier. |
| COMP | 6 | O | Error amplifier output, and input to the PWM comparator. Connect frequency compensation components to this pin. |
| GND | 7 | — | Ground |
| PH | 8 | O | The source of the internal high-side power MOSFET |
| PowerPAD | 9 | — | GND pin must be connected to the exposed pad for proper operation. |