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| 型号： | MAX16818EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/25页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX16818 |
| 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： | 18V |
| 特点： | 可调光 |
| 输入电压： | 6 ~ 28 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX16818 |
1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
Inductor Current-Sense Amplifier
The differential current-sense amplifier (CA) provides a
DC gain of 34.5. The maximum input offset voltage of
the current-sense amplifier is 1mV and the common-
mode voltage range is 0 to 5.5V (IN = 7V to 28V). The
current-sense amplifier senses the voltage across a
current-sense resistor. The maximum common-mode
voltage is 3.6V when V IN = 5V.
Inductor Peak-Current Comparator
The peak-current comparator provides a path for fast
cycle-by-cycle current limit during extreme fault condi-
tions, such as an inductor malfunction (Figure 8). Note
the average current-limit threshold of 26.9mV still limits
the output current during short-circuit conditions. To
prevent inductor saturation, select an inductor with a
saturation current specification greater than the average
current limit. Proper inductor selection ensures that only
the extreme conditions trip the peak-current comparator,
such as an inductor with a shorted turn. The 60mV
threshold for triggering the peak-current limit is twice the
full-scale average current-limit voltage threshold. The
Current-Error Amplifier
(For Inductor Currents)
The MAX16818 has a transconductance current-error
amplifier (CEA) with a typical g m of 550μS and 320μA
output sink- and source-current capability. The current-
error amplifier output CLP serves as the inverting input
to the PWM comparator. CLP is externally accessible to
provide frequency compensation for the inner current
loops (Figure 7). Compensate (CEA) so the inductor
current negative slope, which becomes the positive
slope to the inverting input of the PWM comparator, is
less than the slope of the internally generated voltage
ramp (see the Compensation section).
PWM Comparator and R-S Flip-Flop
The PWM comparator (CPWM) sets the duty cycle for
each cycle by comparing the output of the current-error
amplifier to a 2V P-P ramp. At the start of each clock
cycle, an R-S flip-flop resets and the high-side driver
(DH) goes high. The comparator sets the flip-flop as
soon as the ramp voltage exceeds the CLP voltage,
thus terminating the on-cycle (Figure 8).
peak-current comparator has only a 260ns delay.
V DD
PEAK-CURRENT
COMPARATOR
60mV
CLP
CSP
CSN
A V = 34.5
CA
g m = 550 μ S
CEA
MAX16818
SET
BST
EAN
EAOUT
VEA
RAMP
2 x f S (V/s)
CPWM
CLK
S
R
CLR
Q
Q
DH
LX
DL
Figure 8. MAX16818 Phase Circuit
SHDN
PGND
______________________________________________________________________________________
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相关PDF资料 |
PDF描述 |
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| MAX16820EVKIT+ | EVAL KIT FOR MAX16820 |
| MAX16821BEVKIT+ | KIT EVAL FOR MAX16821B |
| MAX16822BEVKIT+ | KIT EVAL FOR MAX16822 |
| MAX16823EVKIT+ | EVAL KIT FOR MAX16823 |
| MAX16824EVKIT+ | KIT EVAL FOR MAX16824 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16818EVKIT+ | 功能描述:LED 照明开发工具 MAX16818 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: |
| MAX16819ATT+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 5V/9V/12V/15V/18V/24V 6TDFN EP - Rail/Tube |
| MAX16819ATT+T | 功能描述:LED照明驱动器 2MHz HB w/HSide Crnt Sense & 5000:1 Dim 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 |
| MAX1681C/D | 功能描述:直流/直流开关转换器 125mA High-Speed Switched-Capacitor Voltage Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1681ESA | 功能描述:直流/直流开关转换器 125mA f-Select Swtcd Voltage Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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