ZHCSLM4B August 2020 – May 2024 LP8864S-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 Pin Configuration and Functions
- 5 Specifications
-
6 Detailed Description
- 6.1 Overview
- 6.2 Functional Block Diagram
- 6.3
Feature Description
- 6.3.1 Control Interface
- 6.3.2 Function Setting
- 6.3.3 Device Supply (VDD)
- 6.3.4 Enable (EN)
- 6.3.5 Charge Pump
- 6.3.6 Boost Controller
- 6.3.7 LED Current Sinks
- 6.3.8 Brightness Control
- 6.3.9
Protection and Fault Detections
- 6.3.9.1 Supply Faults
- 6.3.9.2
Boost Faults
- 6.3.9.2.1 Boost Overvoltage Faults (BSTOVPL, BSTOVPH)
- 6.3.9.2.2 Boost Overcurrent Faults (BSTOCP)
- 6.3.9.2.3 LEDSET Resistor Missing Faults (LEDSET)
- 6.3.9.2.4 MODE Resistor Missing Faults (MODESEL)
- 6.3.9.2.5 FSET Resistor Missing Faults (FSET)
- 6.3.9.2.6 ISET Resistor Out of Range Faults (ISET)
- 6.3.9.2.7 Thermal Shutdown Faults (TSD)
- 6.3.9.3 LED Faults
- 6.3.9.4 Overview of the Fault and Protection Schemes
- 6.4 Device Functional Modes
- 6.5 Programming
- 7 Register Maps
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
Full Feature Application for Display Backlight
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Inductor Selection
- 8.2.1.2.2 Output Capacitor Selection
- 8.2.1.2.3 Input Capacitor Selection
- 8.2.1.2.4 Charge Pump Output Capacitor
- 8.2.1.2.5 Charge Pump Flying Capacitor
- 8.2.1.2.6 Output Diode
- 8.2.1.2.7 Switching FET
- 8.2.1.2.8 Boost Sense Resistor
- 8.2.1.2.9 Power-Line FET
- 8.2.1.2.10 Input Current Sense Resistor
- 8.2.1.2.11 Feedback Resistor Divider
- 8.2.1.2.12 Critical Components for Design
- 8.2.1.3 Application Curves
- 8.2.2 Application with Basic/Minimal Operation
- 8.2.3
SEPIC Mode Application
- 8.2.3.1 Design Requirements
- 8.2.3.2
Detailed Design Procedure
- 8.2.3.2.1 Inductor Selection
- 8.2.3.2.2 Coupling Capacitor Selection
- 8.2.3.2.3 Output Capacitor Selection
- 8.2.3.2.4 Input Capacitor Selection
- 8.2.3.2.5 Charge Pump Output Capacitor
- 8.2.3.2.6 Charge Pump Flying Capacitor
- 8.2.3.2.7 Switching FET
- 8.2.3.2.8 Output Diode
- 8.2.3.2.9 Switching Sense Resistor
- 8.2.3.2.10 Power-Line FET
- 8.2.3.2.11 Input Current Sense Resistor
- 8.2.3.2.12 Feedback Resistor Divider
- 8.2.3.2.13 Critical Components for Design
- 8.2.3.3 Application Curves
- 8.2.1
Full Feature Application for Display Backlight
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤(pán)機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購(gòu)信息
3 說(shuō)明
LP8864S-Q1 是一款具有升壓控制器的汽車(chē)級(jí)高效 LED 驅(qū)動(dòng)器。四個(gè)高精度電流阱支持根據(jù)使用的通道數(shù)自動(dòng)調(diào)整相移?？赏ㄟ^(guò) I2C 接口或 PWM 輸入對(duì) LED 亮度進(jìn)行全局控制。
升壓控制器基于 LED 電流阱余量電壓進(jìn)行自適應(yīng)輸出電壓控制。該特性可在所有條件下將升壓電壓調(diào)節(jié)到能夠滿(mǎn)足需要的最低水平，從而更大限度降低功耗。憑借寬范圍可調(diào)頻率，LP8864S-Q1 可避免 AM 無(wú)線(xiàn)電頻段的干擾。
LP8864S-Q1 支持內(nèi)置混合 PWM 調(diào)光和模擬電流調(diào)光，可降低 EMI、延長(zhǎng) LED 使用壽命并提高總光學(xué)效率。
器件信息
| 器件型號(hào)(1) | 封裝 | 本體尺寸（標(biāo)稱(chēng)值） |
|---|---|---|
| LP8864S-Q1 | HTSSOP (38) | 9.70mm × 4.40mm |
| QFN (32) | 5mm × 5mm |
(1) 如需了解所有可用封裝，請(qǐng)參閱數(shù)據(jù)表末尾的可訂購(gòu)產(chǎn)品附錄。
簡(jiǎn)化版原理圖
系統(tǒng)效率