ZHCSFU3 December 2016 TPS54262-EP
PRODUCTION DATA.
- 1 特性
- 2 應用范圍
- 3 說明
- 4 修訂歷史記錄
- 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 Unregulated Input Voltage
- 7.3.2 Regulated Output Voltage
- 7.3.3 Regulation and Feedback Voltage
- 7.3.4 Enable and Shutdown
- 7.3.5 Soft Start
- 7.3.6 Oscillator Frequency
- 7.3.7 Slew Rate Control
- 7.3.8 Reset
- 7.3.9 Reset Delay
- 7.3.10 Reset Threshold and Undervoltage Threshold
- 7.3.11 Overvoltage Supervisor
- 7.3.12 Noise Filter on RST_TH and OV_TH Terminals
- 7.3.13 Boot Capacitor
- 7.3.14 Short Circuit Protection
- 7.3.15 Overcurrent Protection
- 7.3.16 Internal Undervoltage Lockout (UVLO)
- 7.3.17 Thermal Shutdown (TSD)
- 7.3.18 Loop Control Frequency Compensation - Type 3
- 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
Component Selection
- 8.2.2.1.1 Input Capacitors (C1, C11)
- 8.2.2.1.2 Output Capacitor (C4, C12)
- 8.2.2.1.3 Soft-Start Capacitor (C6)
- 8.2.2.1.4 Bootstrap Capacitor (C3)
- 8.2.2.1.5 Power-On Reset Delay (PORdly) Capacitor (C2)
- 8.2.2.1.6 Output Inductor (L1)
- 8.2.2.1.7 Flyback Schottky Diode (D2)
- 8.2.2.1.8 Resistor to Set Slew Rate (R7)
- 8.2.2.1.9 Resistor to Select Switching Frequency (R8)
- 8.2.2.1.10 Resistors to Select Output Voltage (R4, R5)
- 8.2.2.1.11 Resistors to Set Undervoltage, Overvoltage, and Reset Thresholds (R1, R2, R3)
- 8.2.2.1.12 Low-Power Mode (LPM) Threshold
- 8.2.2.1.13 Enable Pin Pull-Up Resistor (R11) and Voltage Divider Resistor (R10)
- 8.2.2.1.14 Pull-Up Resistor (R12) at RST Pin
- 8.2.2.1.15 Type 3 Compensation Components (R5, R6, R9, C5, C7, C8)
- 8.2.2.1.16 Noise Filter on RST_TH and OV_TH Terminals (C9, C10)
- 8.2.2.2
Design Example 1
- 8.2.2.2.1 Calculate the Switching Frequency (fsw)
- 8.2.2.2.2 Calculate the Ripple Current (IRipple)
- 8.2.2.2.3 Calculate the Inductor Value (L1)
- 8.2.2.2.4 Calculate the Output Capacitor and ESR (C4)
- 8.2.2.2.5 Calculate the Feedback Resistors (R4, R5)
- 8.2.2.2.6 Calculate Type 3 Compensation Components
- 8.2.2.2.7 Calculate Soft-Start Capacitor (C6)
- 8.2.2.2.8 Calculate Bootstrap Capacitor (C3)
- 8.2.2.2.9 Calculate Power-On Reset Delay Capacitor (C2)
- 8.2.2.2.10 Calculate Input Capacitor (C1, C11)
- 8.2.2.2.11 Calculate Resistors to Control Slew Rate (R7)
- 8.2.2.2.12 Resistors to Select Undervoltage, Overvoltage and Reset Threshold Values (R1, R2, R3)
- 8.2.2.2.13 Diode D1 and D2 Selection
- 8.2.2.2.14 Noise Filter on RST_TH and OV_TH Terminals (C9 and C10)
- 8.2.2.2.15 Power Budget and Temperature Estimation
- 8.2.2.3
Design Example 2
- 8.2.2.3.1 Calculate the Switching Frequency (fsw)
- 8.2.2.3.2 Calculate the Ripple Current (IRipple)
- 8.2.2.3.3 Calculate the Inductor Value (L1)
- 8.2.2.3.4 Calculate the Output Capacitor and ESR (C4, C12)
- 8.2.2.3.5 Calculate the Feedback Resistors (R4, R5)
- 8.2.2.3.6 Calculate Type 3 Compensation Components
- 8.2.2.3.7 Calculate Soft-Start Capacitor (C6)
- 8.2.2.3.8 Calculate Bootstrap Capacitor (C3)
- 8.2.2.3.9 Calculate Power-On Reset Delay Capacitor (C2)
- 8.2.2.3.10 Calculate Input Capacitor (C1, C11)
- 8.2.2.3.11 Calculate Resistors to Control Slew Rate (R7)
- 8.2.2.3.12 Resistors to Select Undervoltage, Overvoltage and Reset Threshold Values (R1, R2, R3)
- 8.2.2.3.13 Diode D1 and D2 Selection
- 8.2.2.3.14 Noise Filter on RST_TH and OV_TH Terminals (C9 and C10)
- 8.2.2.3.15 Power Budget and Temperature Estimation
- 8.2.2.1
Component Selection
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
1 特性
- 異步開關模式穩壓器
- 適用于汽車電子 應用
- 3.6V 至 48V 運行范圍，可耐受高達 60V 的瞬態電壓
- 2A 最大負載電流
- 50µA 靜態電流（典型值）
- 200kHz 至 2.2MHz 開關頻率
- 0.8V ± 1.5% 電壓基準
- 耐高壓的使能輸入
- 啟用周期上的軟啟動
- 內部電源開關上的轉換率控制
- 低功耗模式，適用于輕載條件
- 可通過編程設定的上電復位延遲
- 誤差放大器外部補償
- 針對快速負瞬態變化的復位功能濾波時間
- 可編程過壓、欠壓輸出監測計
- 熱感應和關斷
- 開關電流限制保護
- 場效應晶體管 (FET) 的短路和過流保護
- 結溫范圍：-55°C 至 150°C
- 20 引腳散熱薄型小外形尺寸 (HTSSOP) PowerPAD™的 8 引腳小外形尺寸 (SO) 封裝
-
支持國防、航天和醫療 應用：
- 可控基線
- 一個組裝/測試場所
- 一個制造場所
- 在擴展溫度范圍（-55°C 至 125°C）內可用
- 延長的產品生命周期
- 延長產品的變更通知
- 產品可追溯性
2 應用范圍
- 汽車遠程信息處理和緊急呼叫
- 汽車信息娛樂系統和儀表板
- 音響主機
- 導航
- 顯示屏
3 說明
TPS54262-EP 器件是一款 60V、2A 降壓開關模式電源，支持低功耗模式并配有集成N 溝道金屬氧化物半導體 (NMOS) 開關 FET 的可編程電壓監控器。集成輸入電壓線路前饋拓撲結構改進了電壓模式降壓穩壓器的線路瞬態穩壓性能。穩壓器具有逐周期電流限值。此外，該器件還 具備 在輕載條件下以低功耗模式運行的特性，可將電源電流降至 50µA（典型值）。通過將 EN 引腳下拉為低電平，電源關斷電流可降至 1µA（典型值）。
開漏復位信號指示標稱輸出降至通過外部電阻分壓器網絡設置的復位閾值以下。輸出電壓啟動斜坡由軟啟動電容控制。內部欠壓關斷在輸入電源電壓斜降至 2.6V 時激活。 該器件具有 短路保護電路，能夠在過載條件下為器件提供保護，此外還具備熱關斷保護功能。
器件信息(1)
| 器件型號 | 封裝 | 封裝尺寸（標稱值） |
|---|---|---|
| TPS54262-EP | HTSSOP (20) | 6.50mm x 4.40mm |
- 要了解所有可用封裝，請見數據表末尾的可訂購產品附錄。
簡化電路原理圖
轉換器典型效率
