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
6.7
Typical Characteristics
Figure 2.
R
DSON
vs Temperature
Figure 4.
V
HR_MIN
vs Temperature
Figure 6.
PWM V
IH
vs Temperature
Figure 3.
I
Q
Shutdown vs Temperature
Figure 5.
POR Threshold vs Temperature
Figure 7.
PWM V
IL
vs Temperature