ZHCSCC4D
November 2013 – March 2019
LM3697
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
简化原理图
升压效率
4
修订历史记录
5
Pin Configuration and Functions
Pin Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.1.1
PWM Input
7.1.2
HWEN Input
7.1.3
Thermal Shutdown
7.2
Functional Block Diagram
7.3
Feature Descriptions
7.3.1
High-Voltage LED Control
7.3.1.1
High-Voltage Boost Converter
7.3.1.2
High-Voltage Current Sinks (HVLED1, HVLED2 and HVLED3)
7.3.1.3
High-Voltage Current String Biasing
7.3.2
Boost Switching-Frequency Select
7.3.3
Automatic Switching Frequency Shift
7.3.4
Brightness Register Current Control
7.3.4.1
8-Bit Control (Preferred)
7.3.4.2
11-Bit Control
7.3.5
PWM Control
7.3.5.1
PWM Input Frequency Range
7.3.5.2
PWM Input Polarity
7.3.5.3
PWM Zero Detection
7.3.6
Start-up/Shutdown Ramp
7.3.7
Run-Time Ramp
7.3.8
High-Voltage Control A and B Ramp Select
7.4
Device Functional Modes
7.4.1
LED Current Mapping Modes
7.4.1.1
Exponential Mapping
7.4.1.1.1
8-Bit Code Calculation
7.4.1.1.2
11-Bit Code Calculation
7.4.1.2
Linear Mapping
7.4.1.2.1
8-Bit Code Calculation
7.4.1.2.2
11-Bit Code Calculation
7.4.2
Fault Flags/Protection Features
7.4.2.1
Open LED String (HVLED)
7.4.2.2
Shorted LED String (HVLED)
7.4.2.3
Overvoltage Protection (Inductive Boost)
7.4.2.4
Current Limit (Inductive Boost)
7.4.3
I2C-Compatible Interface
7.4.3.1
Start And Stop Conditions
7.4.3.2
I2C-Compatible Address
7.4.3.3
Transferring Data
7.4.3.4
High-Speed Mode
7.5
Register Maps
8
Application and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Boost Converter Maximum Output Power
8.2.2.1.1
Peak Current Limited
8.2.2.1.2
Output Voltage Limited
8.2.2.2
Inductor Selection
8.2.2.3
Output Capacitor Selection
8.2.2.4
Schottky Diode Selection
8.2.2.5
Input Capacitor Selection
8.2.2.6
Application Circuit Component List
8.2.3
Application Performance Plots
8.3
Initialization Set Up
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.1.1
Boost Output Capacitor Placement
10.1.2
Schottky Diode Placement
10.1.3
Inductor Placement
10.1.4
Boost Input Capacitor Placement
10.2
Layout Example
11
器件和文档支持
11.1
器件支持
11.1.1
第三方产品免责声明
11.2
相关文档
11.3
接收文档更新通知
11.4
社区资源
11.5
商标
11.6
静电放电警告
11.7
术语表
12
机械、封装和可订购信息
封装选项
请参考 PDF 数据表获取器件具体的封装图。
机械数据 (封装 | 引脚)
YFQ|12
散热焊盘机械数据 (封装 | 引脚)
订购信息
zhcscc4d_oa
zhcscc4d_pm
1
特性
可驱动三个并联高压 LED 灯串,用于显示屏和键盘照明
高压灯串的输入电压高达 40V,效率高达 90%
灌电流高达 30mA
11 位可配置调光分辨率
用于内容可调亮度控制 (CABC) 的 PWM 输入
完全可配置的 LED 分组和控制
集成 1A/40V MOSFET
自适应升压输出至 LED 电压
可选 500kHz 和 1MHz 开关频率
四种可配置过压保护阈值(16V、24V、32V 和 40V)
过流保护
热关断保护
总解决方案尺寸为 29mm
2