ZHCSMV4A December 2020 – December 2022 TPS548B28
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 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 Internal VCC LDO And Using External Bias On VCC Pin
- 7.3.2 Enable
- 7.3.3 Output Voltage Setting
- 7.3.4 Internal Fixed Soft Start and External Adjustable Soft Start
- 7.3.5 External REFIN For Output Voltage Tracking
- 7.3.6 Frequency and Operation Mode Selection
- 7.3.7 D-CAP3? Control Mode
- 7.3.8 Low-side FET Zero-Crossing
- 7.3.9 Current Sense and Positive Overcurrent Protection
- 7.3.10 Low-side FET Negative Current Limit
- 7.3.11 Power Good
- 7.3.12 Overvoltage and Undervoltage Protection
- 7.3.13 Out-Of-Bounds (OOB) Operation
- 7.3.14 Output Voltage Discharge
- 7.3.15 UVLO Protection
- 7.3.16 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 Output Voltage Setting Point
- 8.2.2.2 Choose the Switching Frequency and the Operation Mode
- 8.2.2.3 Choose the Inductor
- 8.2.2.4 Set the Current Limit (TRIP)
- 8.2.2.5 Choose the Output Capacitor
- 8.2.2.6 Choose the Input Capacitors (CIN)
- 8.2.2.7 Soft Start Capacitor (SS/REFIN Pin)
- 8.2.2.8 EN Pin Resistor Divider
- 8.2.2.9 VCC Bypass Capacitor
- 8.2.2.10 BOOT Capacitor
- 8.2.2.11 PGOOD Pullup Resistor
- 8.2.3 Application Curves
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
6.6 Typical Characteristics
Figure 6-1 Efficiency vs
Output Current, 12 VIN, 800 kHz, DCM, VCC =
Int
Figure 6-3 Efficiency vs
Output Current, 12 VIN, 800 kHz, FCCM, VCC =
Int
| Vin = 12 V | Vout = 1 V | Int Vcc |
| 300 nH | 800 kHz |
| Vin = 12 V | Vout = 1 V | Ext Vcc 3.3 V |
| 300 nH | 800 kHz |
Figure 6-9 Switching
Frequency vs Output Voltage
| VIN = 12 V | VEN = 0 V | Internal VCC LDO |
| VIN = 12 V |
Figure 6-2 Efficiency vs
Output Current, 12 VIN, 800 kHz, DCM, VCC = EXT 3.3
V
Figure 6-4 Efficiency vs
Output Current, 12 VIN, 800 kHz, FCCM, VCC = EXT 3.3
V
| Vin = 12 V | Vout = 5 V | Int Vcc |
| 800 nH | 600 kHz |
| Vin = 12 V | Vout = 5 V | Ext Vcc 3.3 V |
| 800 nH | 600 kHz |
Figure 6-10 Output Voltage vs
Output Current
| VIN = 12 V | IVCC = 2 mA |
| VIN = 12 V |