ZHCSD61L July 2012 – May 2019 LP8556
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Options
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information
- 7.5 Electrical Characteristics
- 7.6 Electrical Characteristics — Boost Converter
- 7.7 Electrical Characteristics — LED Driver
- 7.8 Electrical Characteristics — PWM Interface
- 7.9 Electrical Characteristics — Logic Interface
- 7.10 I2C Serial Bus Timing Parameters (SDA, SCL)
- 7.11 Typical Characteristics
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Boost Converter
- 8.3.2 Brightness Control
- 8.3.3 Fault Detection
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Maps
- 8.6.1 Register Bit Explanations
- 8.6.2
EPROM Bit Explanations
- 8.6.2.1 LP8556TM (DSBGA) Configurations and Pre-Configured EPROM Settings
- 8.6.2.2 LP8556TM (DSBGA) Configurations and Pre-configured EPROM Settings Continued
- 8.6.2.3 LP8556SQ (WQFN) Configurations and Pre-configured EPROM Settings
- 8.6.2.4 CFG98
- 8.6.2.5 CFG9E
- 8.6.2.6 CFG0
- 8.6.2.7 CFG1
- 8.6.2.8 CFG2
- 8.6.2.9 CFG3
- 8.6.2.10 CFG4
- 8.6.2.11 CFG5
- 8.6.2.12 CFG6
- 8.6.2.13 CFG7
- 8.6.2.14 CFG9
- 8.6.2.15 CFGA
- 8.6.2.16 CFGE
- 8.6.2.17 CFGF
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
- RTW|24
訂購信息
8.3.2.5.1 PWM Control
PWM control is the traditional way of controlling the brightness using PWM of the outputs with the same LED current across the entire brightness range. Brightness control is achieved by varying the duty cycle proportional to the input PWM. PWM frequency is set either using an external set fesistor (RFSET) or using the PWM_FREQ EPROM field. The maximum LED current is set by using an external set Resistor (RISET), CURRENT, and CURRENT_MAX EPROM bits. PWM frequency can also be set by simply using the CURRENT and CURRENT_MAX EPROM bits.
NOTE
The output PWM signal is de-coupled and generated independent of the input PWM signal eliminating display flicker issues and allowing better noise immunity.
Figure 8. PWM Only Output Dimming Scheme