参数资料
| 型号： | APGRD004 |
| 厂商： | Microchip Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | REF DESIGN MOD AUTO AMBNT LIGHT |
| 产品培训模块： | Microchip MCP20xx LIN Transceiver Overview |
| 标准包装： | 1 |
| 主要目的： | 照明，RGB LED 控制器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP2021，PIC12F615 |
| 主要属性： | 4 Tiny 板，每个板带：RGB LED，LIN 收发器，稳压器，MCU |
| 次要属性： | 对 LIN 指令加以解释，以控制 16,383 种颜色和 1,023 种调光级 |
| 已供物品： | 4 个板，CD |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 相关产品： | PIC12F615-I/MF-ND - IC PIC MCU FLASH 1KX14 8DFN PIC12F615T-I/MF-ND - IC PIC MCU FLASH 1KX14 8DFN PIC12F615-E/MF-ND - IC PIC MCU FLASH 1KX14 8DFN MCP2021T-500E/SNTR-ND - IC LIN TXRX ON-BOARD VREG 8SOIC MCP2021T-500E/MDTR-ND - IC LIN TXRX ON-BOARD VREG 8DFN MCP2021T-330E/SNTR-ND - IC LIN TXRX ON-BOARD VREG 8SOIC MCP2021T-330E/MD-ND - IC LIN TXRX ON-BOARD VREG 8DFN MCP2021-500E/SN-ND - IC LIN TXRX ON-BOARD VREG 8SOIC MCP2021-500E/P-ND - IC LIN TXRX ON-BOARD VREG 8DIP MCP2021-500E/MD-ND - IC LIN TXRX ON-BOARD VREG 8DFN 更多... |
LED Lighting Solutions
Digital Control vs. Analog Control
LEDs can be driven with a fully digital control loop. Instead
of measuring the LED current with an op amp or comparator
circuit, the LED current is sampled using an ADC. Some
type of digital algorithm replaces the analog control loop.
A proportional-integral-derivative (PID) control algorithm is
commonly used because it has software coefficients that
can readily be adjusted to affect the controller behavior. A
digital PWM peripheral is used to drive the LED. The digital
algorithm computes an output based on its inputs and
provides the duty cycle for the PWM peripheral.
Literature on the Web
■ AN1138 – A Digital Constant Current Power LED Driver,
DS01138
Low Cost Digital Control
Some power supply applications require fast dynamic
response to compensate for load changes. In these
applications, a fast ADC and fast calculation performance
are required. However, a LED provides a stable load for a
constant-current power supply. Therefore, a fast ADC and fast
processing power are not always required to implement a
digital control loop for a LED driver application.
A low-cost device in the PIC12F or PIC16F family with a CCP
peripheral and an ADC can be used to implement a LED
driver using digital control. The CCP peripheral is used in
PWM mode to control the power supply circuit. Operating
from the internal 8 MHz device oscillator, the CCP can
provide PWM frequencies above 100 KHz to keep power
component sizes small. Since the LED provides a constant
load, it is sufficient to sample the output current and adjust
the PWM duty cycle at a much lower rate. A sample rate of
1000 Hz is ideal for many applications.
Comparison of Digital Control vs. Analog Control Functions
Set
Controller
Feedback Loop
Analog Controller
Digital Controller
Microcontroller
Set Point
+
–
Controller
Output
Feedback
Set Point
ADC
PID or
Digital Filter
Algorithm
PWM
Controller
Output
Feedback
PIC12HV615 Buck LED Driver with Digital Control
DC Bus
5V
15V
LED
String
PIC12HV615
Other Device Options:
PIC12F1822
PIC16F1823
ADC Input
Current
Sense
Filter
125 KHz
PWM
MCP1402
Gate Driver
12
LED Lighting Solutions Design Guide
www.microchip.com/lighting
相关PDF资料 |
PDF描述 |
|---|---|
| ARD00280 | KIT REF DESIGN PIC18F87J72 1PH |
| ARD00330 | DAUGHTER BOARD PIC18F87J72 |
| AS168X-CB2F200N | CIRCUIT BRKR THERMAL 20A 2POLE |
| AS168X-CB3DF150-618 | CIRCUIT BRKR THERMAL 15A 3POLE |
| AS168X-CB3G300 | CIRCUIT BRKR THERMAL 30.0A 3POLE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| APGSABA | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:CUSTOM SHUTTER ASSEMBLY 制造商:OMRON Industrial Automation 功能描述:CUSTOM SHUTTER ASSEMBLY |
| APG-SA-BA | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:CUSTOM SHUTTER ASSEMBLY 制造商:OMRON Industrial Automation 功能描述:CUSTOM SHUTTER ASSEMBLY 制造商:Omron Corporation 功能描述:Custom Shutter Assembly 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:Custom Shutter Assembly |
| AP-GT1-1P-2428/1.6C(90) | 制造商:Hirose 功能描述:AP-GT1-1P-2428/1.6C(90) |
| APGT1-1P-2428/1.6C(91 | 制造商:Hirose 功能描述:APGT1-1P-2428/1.6C(91 |
| APGT1-1P-2428/1.6C-WS(61) | 制造商:Hirose 功能描述:APGT1-1P-2428/1.6C-WS(61) |
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