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参数资料
| 型号： | MAX16820EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX16820 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 1A |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 20V |
| 特点： | 可调光 |
| 输入电压： | 5 ~ 28V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX16820 |
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
MOSFET Selection
The MAX16819/MAX16820’s gate driver is capable of
sourcing 0.5A and sinking 1A of current. MOSFET selec-
tion is based on the maximum input operating voltage
V IN , output current I LED , and operating switching fre-
quency. Choose a MOSFET that has a higher break-
down voltage than the maximum operation voltage, low
R DS(ON) , and low total charge for better efficiency.
MOSFET threshold voltage must be adequate if operat-
ed at the low end of the input-voltage operating range.
Freewheeling Diode Selection
The forward voltage of the freewheeling diode should
be as low as possible for better efficiency. A Schottky
diode is a good choice as long as the breakdown volt-
age is high enough to withstand the maximum operat-
ing voltage.
The forward current rating of the diode must be at least
equal to the maximum LED current.
LED Current Ripple
The LED current ripple is equal to the inductor current
ripple. In cases when a lower LED current ripple is
needed, a capacitor can be placed across the LED ter-
minals.
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
losses and stable operation. Use a multilayer board
whenever possible for better noise immunity. Minimize
ground noise by connecting high-current ground
returns, the input bypass-capacitor ground lead, and
the output-filter ground lead to a single point (star
ground configuration). In normal operation, there are
two power loops. One is formed when the MOSFET is
on and the high current flows through IN—R SENSE —
LEDs—Inductor—MOSFET—GND. The other loop is
formed when the MOSFET is off when the high current
circulates through R SENSE —LEDs —Inductor —free-
wheeling diode. To minimize noise interaction, each
loop area should be as small as possible.
Place R SENSE as close as possible to the input filter
and IN. For better noise immunity, a Kelvin connection
is strongly recommended between CSN and R SENSE .
Connect the exposed paddle to a large-area ground
plane for improved power dissipation.
Chip Information
PROCESS: BiCMOS
8
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相关PDF资料 |
PDF描述 |
|---|---|
| MAX16821BEVKIT+ | KIT EVAL FOR MAX16821B |
| MAX16822BEVKIT+ | KIT EVAL FOR MAX16822 |
| MAX16823EVKIT+ | EVAL KIT FOR MAX16823 |
| MAX16824EVKIT+ | KIT EVAL FOR MAX16824 |
| MAX16825EVKIT+ | KIT EVAL FOR MAX16825 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16820EVKIT+ | 功能描述:LED 照明开发工具 MAX16820 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX16821AATI+ | 功能描述:LED照明驱动器 Synchronous HB w/Rapid Current Puls RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16821AATI+T | 功能描述:LED照明驱动器 Synchronous HB w/Rapid Current Puls RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16821BATI+ | 功能描述:LED照明驱动器 Synchronous HB w/Rapid Current Puls RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16821BATI+T | 功能描述:LED照明驱动器 Synchronous HB w/Rapid Current Puls RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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