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参数资料
| 型号： | MAX16838AUP+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/21页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HIGH BRIGHT 20TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 74 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM，SEPIC，递升（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 4.75 V ~ 40 V，4.55 V ~ 5.5 V |
| 输出电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
MAX16838
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
Output Capacitor Selection in
Boost Configuration
For the boost converter, the output capacitor
supplies the load current when the main switch is on.
The required output capacitance is high, especially at
higher duty cycles.
Calculate the output capacitor (C OUT ) using the follow-
ing equation:
C OUT > (D MAX x I LED )/(V LED_P-P x f SW )
Feedback Compensation
The voltage feedback loop needs proper compensa-
tion for stable operation. This is done by connecting
a resistor (R COMP ) and capacitor (C COMP ) in series
from COMP to SGND. R COMP is chosen to set the high-
frequency integrator gain for fast transient response,
while C COMP is chosen to set the integrator zero to main-
tain loop stability. For optimum performance, choose the
components using the following equations:
where V LED_P-P is the peak-to-peak ripple in the LED
supply voltage. Use a combination of low-ESR and high-
capacitance ceramic capacitors for lower output ripple
R COMP =
f ZRHP × R CS × I LED
5 × FP1 × GM COMP × V LED × (1 ? D MAX )
V LED (1 ? D MAX ) 2
2 π × L × I LED
and noise.
Input Capacitor Selection in Boost Configuration
The input current for the boost converter is continuous
and the RMS ripple current at the input capacitor is low.
Calculate the minimum input capacitor C IN using the fol-
lowing equation:
C IN = IL P-P /(8 x f SW x V IN_P-P )
where V IN_P-P is the peak-to-peak input ripple voltage.
This equation assumes that input capacitors supply
most of the input ripple current.
Rectifier Diode Selection
Using a Schottky rectifier diode produces less forward drop
and puts the least burden on the MOSFET during reverse
where
f ZRHP =
is the right-half plane zero for the boost regulator.
R CS is the current-sense resistor in series with the
source of the internal switching MOSFET. I LED is the total
LED current that is the sum of the LED currents in both
the channels. V LED is the output voltage of the boost
regulator. D MAX is the maximum duty cycle that occurs
at minimum input voltage. GM COMP is the transconduc-
tance of the error amplifier.
recovery. A diode with considerable reverse-recovery time
increases the MOSFET switching loss. Select a Schottky
diode with a voltage rating 20% higher than the maximum
FP1 =
I LED
2 × π × V LED × C OUT
f ZRHP /5.
C COMP =
boost-converter output voltage and current rating greater
than that calculated in the following equation:
I D = IL AVG ( 1 - D MAX ) ( A )
16
is the output pole formed by the boost regulator.
Set the zero formed by R COMP and C COMP a decade
below the crossover frequency. Using the value of
R COMP from above, the crossover frequency is at
50
2 π × R COMP × f ZRHP
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16838AUP/V+ | 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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 |
| MAX16838AUP/V+T | 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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 |
| MAX16838AUP+ | 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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 |
| MAX16838AUP+T | 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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 |
| MAX16838EVKIT+ | 功能描述:LED 照明开发工具 MAX16838 evaluation 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: |
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