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| 型号： | MAX16831ATJ+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HIGH BRIGHT 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB |
| 频率： | 125kHz ~ 600kHz |
| 电源电压： | 5.5 V ~ 76 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1425 (CN2011-ZH PDF) |
MAX16831
High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
( V INMAX - V OUT ) × V OUT
Applications Information
Inductor Selection
The minimum required inductance is a function of oper-
ating frequency, input-to-output voltage differential, and
the peak-to-peak inductor current ( ? I L ). Higher ? I L
allows for a lower inductor value while a lower ? I L
requires a higher inductor value. A lower inductor value
minimizes size and cost, improves large-signal tran-
sient response but reduces efficiency due to higher
peak currents and higher peak-to-peak output ripple
voltage for the same output capacitance. On the other
hand, higher inductance increases efficiency by reduc-
ing the ripple current, ? I L . However, resistive losses
due to extra turns can exceed the benefit gained from
lower ripple current levels, especially when the induc-
tance is increased without also allowing for larger
inductor dimensions. A good compromise is to choose
? I L equal to 30% of the full load current. The inductor
saturating current is also important to avoid runaway
current during the output overload and continuous
short circuit. Select the I SAT to be higher than the maxi-
where V INMIN is the minimum input voltage, V OUT is the
output voltage, and f SW is the switching frequency.
Output Capacitor
The function of the output capacitor is to reduce the
output ripple to acceptable levels. The ESR, ESL, and
the bulk capacitance of the output capacitor contribute
to the output ripple. In most of the applications, the out-
put ESR and ESL effects can be dramatically reduced
by using low-ESR ceramic capacitors. To reduce the
ESL effects, connect multiple ceramic capacitors in
parallel to achieve the required bulk capacitance.
In a buck configuration, the output capacitance, C F , is
calculated using the following equation:
C F ≥
? V R × 2 × L × V INMAX × f SW 2
where ? V R is the maximum allowable output ripple.
In a boost configuration, the output capacitance, C F , is
calculated as:
mum peak current limit.
Buck configuration: In a buck configuration, the aver-
age inductor current does not vary with the input. The
worst-case peak current occurs at a high input voltage.
C F ≥
(V OUT - V INMIN ) × 2 × I OUT
? V R × V OUT × f SW
L =
2 × V OUT × I OUT
? V R OUT INMIN SW
C F ≥
In this case, the inductance L for continuous conduc-
tion mode is given by:
V OUT × (V INMAX - V OUT )
V INMAX × f SW × ? I L
where V INMAX is the maximum input voltage, f SW is the
switching frequency, and V OUT is the output voltage.
Boost configuration: In the boost converter, the average
inductor current varies with line and the maximum aver-
age current occurs at low line. For the boost converter,
the average inductor current is equal to the input cur-
rent. In this case, the inductance L is calculated as:
where I OUT is the output current.
In a buck-boost configuration, the output capacitance,
C F , is calculated as:
× ( V + V ) × f
where V OUT is the voltage across the load and I OUT is
the output current. Connect the output capacitor(s)
from the output to ground in a buck-boost configuration
(not across the load as for other configurations).
Input Capacitor
L =
V INMIN × (V OUT - V INMIN )
V OUT × f SW × ? I L
A capacitor connected between the input line and
ground must be used when configuring the MAX16831
as a buck converter. Use a low-ESR input capacitor
that can handle the maximum input RMS ripple current.
where V INMIN is the minimum input voltage, V OUT is the
output voltage, and f SW is the switching frequency.
Calculate the maximum allowable RMS ripple using the
following equation:
Buck-boost configuration: In a buck-boost converter,
the average inductor current is equal to the sum of the
input current and the load current. In this case, the
inductance L is:
I IN ( RMS ) =
I OUT × V OUT × (V INMIN - V OUT )
V INMIN
14
L =
V OUT × V INMIN
( V OUT + V INMIN ) × f SW × ? I L
In most of the cases, an additional electrolytic capaci-
tor should be added to prevent input oscillations due to
line impedances.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16831ATJ/V+ | 功能描述:LED照明驱动器 w/Analog & PWM Dimming Control 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 |
| MAX16831ATJ/V+T | 功能描述:LED照明驱动器 w/Analog & PWM Dimming Control 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 |
| MAX16831ATJ+ | 功能描述:LED照明驱动器 w/Analog & PWM Dimming Control 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 |
| MAX16831ATJ+T | 功能描述:LED照明驱动器 w/Analog & PWM Dimming Control 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 |
| MAX16831EVKIT+ | 功能描述:LED 照明开发工具 MAX16831 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: |
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