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  • 具有 DCS-Control 的 TPS62147、TPS62148 高精度 3V 至 17V 2A 降压转换器

    • ZHCSHZ8B april   2018  – february 2023 TPS62147 , TPS62148

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  • 具有 DCS-Control 的 TPS62147、TPS62148 高精度 3V 至 17V 2A 降压转换器
  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Schematic
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Precise Enable
      2. 9.3.2 Power Good (PG)
      3. 9.3.3 MODE
      4. 9.3.4 Undervoltage Lockout (UVLO)
      5. 9.3.5 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Pulse Width Modulation (PWM) Operation
      2. 9.4.2 Power Save Mode Operation (PWM/PFM)
      3. 9.4.3 100% Duty-Cycle Operation
      4. 9.4.4 Current Limit And Short Circuit Protection (for TPS62148)
      5. 9.4.5 HICCUP Current Limit And Short Circuit Protection (for TPS62147)
      6. 9.4.6 Soft Start / Tracking (SS/TR)
      7. 9.4.7 Output Discharge Function (TPS62148 only)
      8. 9.4.8 Starting into a Pre-Biased Load
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Programming the Output Voltage
      2. 10.1.2 External Component Selection
      3. 10.1.3 Inductor Selection
      4. 10.1.4 Capacitor Selection
        1. 10.1.4.1 Output Capacitor
        2. 10.1.4.2 Input Capacitor
        3. 10.1.4.3 Soft-Start Capacitor
      5. 10.1.5 Tracking Function
      6. 10.1.6 Output Filter and Loop Stability
    2. 10.2 Typical Applications
      1. 10.2.1 Typical Application with Adjustable Output Voltage
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 LED Power Supply
      2. 10.3.2 Powering Multiple Loads
      3. 10.3.3 Voltage Tracking
      4. 10.3.4 Precise Soft-Start Timing
    4. 10.4 Power Supply Recommendations
    5. 10.5 Layout
      1. 10.5.1 Layout Guidelines
      2. 10.5.2 Layout Example
      3. 10.5.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 第三方产品免责声明
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information
  13. 重要声明
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DATA SHEET

具有 DCS-Control 的 TPS62147、TPS62148 高精度 3V 至 17V 2A 降压转换器

本资源的原文使用英文撰写。 为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。 为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 特性

  • 额定 TJ 范围内的输出电压精度为 ±1%（PWM 模式）
  • 输入电压范围：3V 至 17V
  • 静态电流 18µA（典型值）
  • 输出电压范围为 0.8V 至 12V
  • 可调软启动
  • 强制 PWM 或 PWM/PFM 操作
  • 强制 PWM 模式中具有 1.25 MHz 或 2.5MHz 的开关频率
  • 精密使能输入可实现
    • 用户定义的欠压锁定
    • 准确排序
  • 100% 占空比模式
  • 自动效率增强 (AEE)
  • DCS-Control 拓扑
  • 有源输出放电 (TPS62148)
  • HICCUP 过流保护 (TPS62147)
  • 电源正常状态输出
  • 采用 2mm × 3mm VQFN 封装

2 应用

  • 标准 12V 电源轨
  • 移动和嵌入式计算机
  • 多节电池组成的 POL 电源
  • 工厂自动化、PLC、工业 PC
  • 楼宇自动化、视频监控

3 说明

TPS62147 和 TPS62148 是基于 DCS-Control 拓扑的高效且易于使用的同步直流/直流降压转换器。3V 至 17V 的宽输入电压范围使这些器件适用于多节锂离子电池以及 12V 中间电源轨。该器件提供 2A 连续输出电流。这些器件可在轻负载时自动进入节能模式，从而可在整个负载范围内保持高效率。因此，这些器件非常适合需要联网待机性能的应用，如工业 PC 和视频监控。MODE 引脚设置为低之后，器件会根据输出电流以及输入和输出电压自动调整开关频率。该技术称为自动效率增强 (AEE)，可在整个工作范围内保持高转换效率。TPS62147、TPS62148 可在 PWM 模式中提供 1% 的输出电压精度，因此可支持高输出电压精度的电源设计。FSEL 引脚允许在强制 PWM 模式中分别设置 1.25MHz 或 2.5MHz 的开关频率。

典型静态电流为 18µA。在关断模式中，典型电流为 1µA。

此器件提供了可调节版本，采用 3mm x 2mm VQFN 封装。

器件信息
器件型号(2) 封装(1) 封装尺寸（标称值）
TPS62147 RGX（VQFN，11） 3.00mm x 2.00mm
TPS62148 3.00mm x 2.00mm
(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附录。
(2) 请参阅Device Comparison Table。
GUID-59BDE4A7-FDD5-49F8-A8C1-38F00C710DA2-low.gif简化原理图
GUID-45D1B9B3-60C8-438D-A048-CFF14489371E-low.gif效率与输出电流间的关系，Vo = 3.3V；fsw = 1.25MHz；PFM

4 Revision History

Changes from Revision A (January 2023) to Revision B (February 2023)

  • Revision B expanded the listings shown in revision AGo
  • Updated Figure 10-7 to the correct graphGo

Changes from Revision * (April 2018) to Revision A (January 2023)

  • 更新了整个文档中的表格、图和交叉参考的编号格式Go
  • 删除了 DCS-Control 和 AEE 商标Go
  • Updated Absolute Maximum Ratings table noteGo
  • Updated Figure 10-4 Efficiency vs Output current graph on page 20Go
  • Updated Figure 10-8 Efficiency vs Output current graph on page 21Go
  • Updated Figure 10-66 Switching Frequency vs Input Voltage graph on page 30Go
  • Updated Figure 10-68 Switching Frequency vs Input Voltage graph on page 31Go
  • Removed the graph “Switching Frequency vs Junction Temperature (Vout = 1.2 V, 1.8 V, PWM, FSEL= high)" on page 30Go

5 Device Comparison Table

DEVICE NUMBER FEATURES OUTPUT VOLTAGE MARKING
TPS62147 frequency selection on FSEL
HICCUP current limit		 adjustable 62147
TPS62148 frequency selection on FSEL
output voltage discharge		 adjustable 62148

6 Pin Configuration and Functions

GUID-60EB2719-0EBE-4137-AE32-D7467A9A2576-low.gif Figure 6-1 RGX Package11-Pin VQFN
Table 6-1 Pin Functions
PIN I/O DESCRIPTION
NUMBER NAME
1 VIN I Power supply input. Make sure the input capacitor is connected as close as possible between pin VIN and GND.
2 SW Switch pin of the converter connected to the internal Power MOSFETs.
3 GND I Ground pin.
4 AGND I Connect to GND.
5 FB I Voltage feedback input. Connect resistive output voltage divider to this pin.
6 VOS I Output voltage sense pin. Connect directly to the positive pin of the output capacitor.
7 PG O Open drain power good output. Leave open or tie to GND if not used.
8 EN I Enable pin of the device. Connect to logic low to disable the device. Pull high to enable the device. Do not leave this pin unconnected.
9 SS/TR I Soft-start / Tracking pin. An external capacitor connected from this pin to GND defines the rise time for the internal reference voltage. The pin can also be used as an input for tracking and sequencing - see Detailed Description section in this document.
10 MODE I The device runs in PFM/PWM mode when this pin is pulled low. When the pin is pulled high, the device runs in forced PWM mode. Do not leave this pin unconnected.
11 FSEL I Switching frequency setting pin. Pull to logic low for a switching frequency of 1.25 MHz. Pull to logic high for a switching frequency of 2.5 MHz. Do not leave FSEL unconnected.

7 Specifications

7.1 Absolute Maximum Ratings

Over junction temperature range of –40°C to 150°C (unless otherwise noted)(1)
MINMAXUNIT
Pin voltage range(2)VIN–0.320V
SW, VOS–0.3VIN+0.3V
SW (transient for t<10ns)(2)–225.5V
EN, MODE, FSEL, PG, FB, , SS/TR–0.3VIN+0.3V
Operating junction temperature, TJ–40150°C
Storage temperature range, Tstg–65150°C
(1) Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.
(2) While switching

 
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