ZHCSFU3 December 2016 TPS54262-EP
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)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
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
- PWP|20
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
- PWP|20
訂購信息
1 特性
- 異步開關(guān)模式穩(wěn)壓器
- 適用于汽車電子 應(yīng)用
- 3.6V 至 48V 運行范圍，可耐受高達 60V 的瞬態(tài)電壓
- 2A 最大負載電流
- 50µA 靜態(tài)電流（典型值）
- 200kHz 至 2.2MHz 開關(guān)頻率
- 0.8V ± 1.5% 電壓基準(zhǔn)
- 耐高壓的使能輸入
- 啟用周期上的軟啟動
- 內(nèi)部電源開關(guān)上的轉(zhuǎn)換率控制
- 低功耗模式，適用于輕載條件
- 可通過編程設(shè)定的上電復(fù)位延遲
- 誤差放大器外部補償
- 針對快速負瞬態(tài)變化的復(fù)位功能濾波時間
- 可編程過壓、欠壓輸出監(jiān)測計
- 熱感應(yīng)和關(guān)斷
- 開關(guān)電流限制保護
- 場效應(yīng)晶體管 (FET) 的短路和過流保護
- 結(jié)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(yī)療 應(yīng)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(nèi)可用
- 延長的產(chǎn)品生命周期
- 延長產(chǎn)品的變更通知
- 產(chǎn)品可追溯性
2 應(yīng)用范圍
- 汽車遠程信息處理和緊急呼叫
- 汽車信息娛樂系統(tǒng)和儀表板
- 音響主機
- 導(dǎo)航
- 顯示屏
3 說明
TPS54262-EP 器件是一款 60V、2A 降壓開關(guān)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(dǎo)體 (NMOS) 開關(guān) FET 的可編程電壓監(jiān)控器。集成輸入電壓線路前饋拓撲結(jié)構(gòu)改進了電壓模式降壓穩(wěn)壓器的線路瞬態(tài)穩(wěn)壓性能。穩(wěn)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(guān)斷電流可降至 1µA（典型值）。
開漏復(fù)位信號指示標(biāo)稱輸出降至通過外部電阻分壓器網(wǎng)絡(luò)設(shè)置的復(fù)位閾值以下。輸出電壓啟動斜坡由軟啟動電容控制。內(nèi)部欠壓關(guān)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(guān)斷保護功能。
器件信息(1)
| 器件型號 | 封裝 | 封裝尺寸（標(biāo)稱值） |
|---|---|---|
| TPS54262-EP | HTSSOP (20) | 6.50mm x 4.40mm |
- 要了解所有可用封裝，請見數(shù)據(jù)表末尾的可訂購產(chǎn)品附錄。
簡化電路原理圖
轉(zhuǎn)換器典型效率
