ZHCSPT6D July 2023 – June 2024 TPSM8287A06 , TPSM8287A10 , TPSM8287A12 , TPSM8287A15
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Device Options
- 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 DCS-Control Topology
- 7.3.2 Forced-PWM and Power-Save Modes
- 7.3.3 Precise Enable
- 7.3.4 Start-Up
- 7.3.5 Switching Frequency Selection
- 7.3.6 Output Voltage Setting
- 7.3.7 Compensation (COMP)
- 7.3.8 Mode Selection / Clock Synchronization (MODE/SYNC)
- 7.3.9 Spread Spectrum Clocking (SSC)
- 7.3.10 Output Discharge
- 7.3.11 Undervoltage Lockout (UVLO)
- 7.3.12 Overvoltage Lockout (OVLO)
- 7.3.13 Overcurrent Protection
- 7.3.14 Power Good (PG)
- 7.3.15 Remote Sense
- 7.3.16 Thermal Warning and Shutdown
- 7.3.17 Stacked Operation
- 7.4 Device Functional Modes
- 7.5 Programming
- 8 Device Registers
-
9 Application and Implementation
- 9.1 Application Information
- 9.2 Typical Application
- 9.3 Typical Application Using Four TPSM8287Axx in Parallel Operation
- 9.4 Power Supply Recommendations
- 9.5 Layout
- 10Device and Documentation Support
- 11Revision History
- 12Mechanical, Packaging, and Orderable Information
7.3.5 Switching Frequency Selection
The TPSM8287Axx module family consists of device variants with different switching frequencies. For available options see Table 4-1. The different switching frequencies allows the selection of the device which provides the best efficiency by optimizing the power losses for a given use case.
A lower switching frequency version does not necessarily offer a higher efficiency across the entire load, Vin or Vout range. The lower switching frequency does reduce the switching losses in the power stage, but at the same time leads to a higher ripple current in the inductor which leads to higher inductor losses, higher output voltage ripple, and a lower maximum output current (see Section 7.3.13). Because of this, TI recommends to compare the efficiency when picking a certain device variant.
Figure 7-14 and Figure 7-15 provide an efficiency comparison between the 1.5-MHz TPSM8287A12BAS and 2.25-MHz TPSM8287A12BBS. For output voltages ≥ 1.2 V, the efficiency between the 2.25-MHz and 1.5-MHz device is almost the same for high load currents, whereas the 2.25-MHz version gives higher efficiency at load currents below 3 A. The 1.5-MHz device generally gives higher efficiency for the other operating points, especially for lower output voltages. For output voltages >= 1.2 V, TI recommends the 2.25-MHz device for most applications due to the comparable efficiency, lower output voltage ripple, and higher maximum output current.
| VIN = 3.3 V | TA = 25°C | FPWM |
| VIN = 5.0 V | TA = 25°C | FPWM |