</a>LED" title="LED">LED" title="LED">LED PWM發(fā)生器,輸入電壓3V-5.5V,有48個(gè)單獨(dú)的PWM輸出,高達(dá)6.1kHz的PWM頻率(PWMCK = 25MHz),主要用在大屏顯示器LED背光,單色,多色和全色LED顯示器,馬大哈控制,工業(yè)控制,ATE和機(jī)器人.本文介紹了LT8500主要特性,方框圖以及多種應(yīng)用電路.
48-Channel LED PWM Generator with 12-Bit Resolution and 50MHz Cascadable Serial Interface
The LTR8500 is a pulse width modulation (PWM) generator with 48 independent channels. Each channel has an individually adjustable 12-bit (4096-step) PWM register and a 6-bit (64-step) ±50% correction register. All controls are programmable via a simple serial data interface. Three banks of 16-channels each can be configured such that they operate 120° out-of-phase with each other.
The LT8500 features two diagnostic information flags: synchronization error and open LED. The flags are sent, with additional state information, on the serial data interface during status read back. The 50MHz cascadable serial data interface includes buffering and skew-balancing, making the chip suitable for PWM intensive applications such as large screen LCD dynamic backlighting and mono-,multi- and full-color LED displays. The LT8500 is also ideally suited to control three LT3595A LED drivers.
LT8500主要特性:
3V to 5.5V Input Voltage
48 Independent PWM Outputs
TTL/CMOS Logic 50MHz Serial Data Interface
12-Bit (4096 Steps) PWM Width Resolution
6-Bit (64 Steps) PWM Correction (±50% of Programmed PWM Width)
Up to 6.1kHz PWM Frequency (PWMCK = 25MHz)
Phase-Shift Option Reduces Switching Noise
Directly Controls Three LT3595A 16-Channel LED Drivers
Diagnostic Information: Sync Error/Open LED Flags
56-Pin (5mm × 9mm × 0.75mm) QFN Package
LT8500應(yīng)用:
Large Screen Display LED Backlighting
Mono-, Multi-, Full-Color LED Displays
LED Billboards and Signboards
Motor Control
Industrial Control
Automated Test Equipment
Robotics
圖1.LT8500方框圖
圖2.LT8500串行接口拓?fù)鋱D
圖3.LT8500采用5引腳拓?fù)潋?qū)動(dòng)LT3595A的菊花鏈框圖
圖4.LT8500采用4引腳拓?fù)潋?qū)動(dòng)LT3595A的菊花鏈框圖
圖5.單個(gè)LT8500驅(qū)動(dòng)電阻鎮(zhèn)流的48個(gè)LED串電路圖
圖6.單個(gè)LT8500實(shí)現(xiàn)48個(gè)DAC通路圖
詳情請(qǐng)見(jiàn):
http://cds.linear.com/docs/Datasheet/8500f.pdf
48-Channel LED PWM Generator with 12-Bit Resolution and 50MHz Cascadable Serial Interface
The LTR8500 is a pulse width modulation (PWM) generator with 48 independent channels. Each channel has an individually adjustable 12-bit (4096-step) PWM register and a 6-bit (64-step) ±50% correction register. All controls are programmable via a simple serial data interface. Three banks of 16-channels each can be configured such that they operate 120° out-of-phase with each other.
The LT8500 features two diagnostic information flags: synchronization error and open LED. The flags are sent, with additional state information, on the serial data interface during status read back. The 50MHz cascadable serial data interface includes buffering and skew-balancing, making the chip suitable for PWM intensive applications such as large screen LCD dynamic backlighting and mono-,multi- and full-color LED displays. The LT8500 is also ideally suited to control three LT3595A LED drivers.
LT8500主要特性:
3V to 5.5V Input Voltage
48 Independent PWM Outputs
TTL/CMOS Logic 50MHz Serial Data Interface
12-Bit (4096 Steps) PWM Width Resolution
6-Bit (64 Steps) PWM Correction (±50% of Programmed PWM Width)
Up to 6.1kHz PWM Frequency (PWMCK = 25MHz)
Phase-Shift Option Reduces Switching Noise
Directly Controls Three LT3595A 16-Channel LED Drivers
Diagnostic Information: Sync Error/Open LED Flags
56-Pin (5mm × 9mm × 0.75mm) QFN Package
LT8500應(yīng)用:
Large Screen Display LED Backlighting
Mono-, Multi-, Full-Color LED Displays
LED Billboards and Signboards
Motor Control
Industrial Control
Automated Test Equipment
Robotics
圖1.LT8500方框圖
圖2.LT8500串行接口拓?fù)鋱D
圖3.LT8500采用5引腳拓?fù)潋?qū)動(dòng)LT3595A的菊花鏈框圖
圖4.LT8500采用4引腳拓?fù)潋?qū)動(dòng)LT3595A的菊花鏈框圖
圖5.單個(gè)LT8500驅(qū)動(dòng)電阻鎮(zhèn)流的48個(gè)LED串電路圖
圖6.單個(gè)LT8500實(shí)現(xiàn)48個(gè)DAC通路圖
詳情請(qǐng)見(jiàn):
http://cds.linear.com/docs/Datasheet/8500f.pdf
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