ZHCSCL9A July 2014 – September 2021 TPS55340-EP
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 說明（續）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Switching Frequency
- 8.3.2 Voltage Reference and Setting Output Voltage
- 8.3.3 Soft Start
- 8.3.4 Slope Compensation
- 8.3.5 Overcurrent Protection and Frequency Foldback
- 8.3.6 Enable and Thermal Shutdown
- 8.3.7 Undervoltage Lockout (UVLO)
- 8.3.8 Minimum On-Time and Pulse Skipping
- 8.3.9 Layout Considerations
- 8.3.10 Thermal Considerations
- 8.4 Device Functional Modes
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Applications
- 9.2.1
Boost Converter Application
- 9.2.1.1 Design Requirements
- 9.2.1.2
Detailed Design Procedure
- 9.2.1.2.1 Selecting the Switching Frequency (R4)
- 9.2.1.2.2 Determining the Duty Cycle
- 9.2.1.2.3 Selecting the Inductor (L1)
- 9.2.1.2.4 Computing the Maximum Output Current
- 9.2.1.2.5 Selecting the Output Capacitor (C8 to C10)
- 9.2.1.2.6 Selecting the Input Capacitors (C2, C7)
- 9.2.1.2.7 Setting Output Voltage (R1, R2)
- 9.2.1.2.8 Setting the Soft-Start Time (C7)
- 9.2.1.2.9 Selecting the Schottky Diode (D1)
- 9.2.1.2.10 Compensating the Control Loop (R3, C4, C5)
- 9.2.1.3 Application Curves
- 9.2.2
SEPIC Converter Application
- 9.2.2.1 Design Requirements
- 9.2.2.2
Detailed Design Procedure
- 9.2.2.2.1 Selecting the Switching Frequency (R4)
- 9.2.2.2.2 Duty Cycle
- 9.2.2.2.3 Selecting the Inductor (L1)
- 9.2.2.2.4 Calculating the Maximum Output Current
- 9.2.2.2.5 Selecting the Output Capacitor (C8 to C10)
- 9.2.2.2.6 Selecting the Series Capacitor (C6)
- 9.2.2.2.7 Selecting the Input Capacitor (C2, C7)
- 9.2.2.2.8 Selecting the Schottky Diode (D1)
- 9.2.2.2.9 Setting the Output Voltage (R1, R2)
- 9.2.2.2.10 Setting the Soft-Start Time (C3)
- 9.2.2.2.11 MOSFET Rating Considerations
- 9.2.2.2.12 Compensating the Control Loop (R3, C4)
- 9.2.2.3 SEPIC Converter Application Curves
- 9.2.1
Boost Converter Application
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
6 Pin Configuration and Functions
Figure 6-1 16-Pin WQFNRTE Package(Top View)Table 6-1 Pin Functions
| PIN | DESCRIPTION | |
|---|---|---|
| NAME | NO. | |
| AGND | 6 | Signal ground of the IC |
| COMP | 7 | Output of the transconductance error amplifier. An external RC network connected to this pin compensates the regulator feedback loop. |
| EN | 3 | Enable pin. When the voltage of this pin falls below the enable threshold for more than 1 ms, the IC turns off. |
| FB | 8 | Error amplifier input and feedback pin for positive voltage regulation. Connect to the center tap of a resistor divider to program the output voltage. |
| FREQ | 9 | Switching frequency program pin. An external resistor connected between the FREQ pin and AGND sets the switching frequency. |
| NC | 10 | Reserved pin that must be connected to ground |
| 14 | ||
| PGND | 11 | Power ground of the IC. It is connected to the source of the internal power MOSFET switch. |
| 12 | ||
| 13 | ||
| PowerPAD | 17 | The PowerPAD? should be soldered to the AGND. If possible, use thermal vias to connect to internal ground plane for improved power dissipation. |
| SS | 4 | Soft-start programming pin. A capacitor between the SS pin and AGND pin programs soft-start timing. |
| SW | 1 | SW is the drain of the internal power MOSFET. Connect SW to the switched side of the boost or SEPIC inductor or the flyback transformer. |
| 15 | ||
| 16 | ||
| SYNC | 5 | Switching frequency synchronization pin. An external clock signal can be used to set the switching frequency between 200 kHz and 1 MHz. If not used, this pin should be tied to AGND. |
| VIN | 2 | The input supply pin to the IC. Connect VIN to a supply voltage between 2.9 and 32 V. It is acceptable for the voltage on the pin to be different from the boost power stage input. |