参数资料
型号: MAX16816ATJ+T
厂商: Maxim Integrated
文件页数: 23/33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: 2,500
拓扑: PWM,SEPIC,降压(降压),升压(升压)
输出数: 1
内部驱动器:
类型 - 主要: 车载
类型 - 次要: 高亮度 LED(HBLED)
频率: 125kHz ~ 500kHz
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: 带卷 (TR)
工作温度: -40°C ~ 125°C
Programmable Switch-Mode LED Driver
with Analog-Controlled PWM Dimming
V INMIN x ( V OUT ? V INMIN )
V O UT x f SW x Δ I L
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:
L =
where V INMIN is the minimum input voltage, V OUT is the
where V OUT is the voltage across the load and I OUT is
the output current.
Input Capacitor
An input capacitor connected between V CC and
ground must be used when configuring the MAX16816
as a buck converter. Use a low-ESR input capacitor
that can handle the maximum input RMS ripple current.
Calculate the maximum allowable RMS ripple using the
following equation:
output voltage, and f SW is the switching frequency.
Buck-boost configuration: In a buck-boost converter
the average inductor current is equal to the sum of the
I IN(RMS) =
I OUT ×
V OUT × ( V INMIN - V OUT )
V INMIN
input current and the load current. In this case the
inductance, L, is:
In most of the cases, an additional electrolytic capaci-
tor should be added to prevent input oscillations due to
L =
V OUT x V INMIN
( V OUT + V INMIN ) x f SW x Δ I L
line impedances.
When using the MAX16816 in a boost or buck-boost
configuration, the input RMS current is low and the
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:
( V INMAX ? V OUT ) × V OUT
C F ≥
Δ V R × 2 × L × V INMAX × f SW 2
where Δ V R is the maximum allowable output ripple.
In a boost configuration, the output capacitance, C F , is
calculated as:
input capacitance can be small (see the Typical
Operating Circuits).
Operating the MAX16816 Without the
Dimming Switch
The MAX16816 can also be used in the absence of the
dimming MOSFET. In this case, the PWM dimming per-
formance is compromised but in applications that do
not require dimming the MAX16816 can still be used. A
short circuit across the load will cause the MAX16816
to disable the gate drivers and they will remain off until
the input power is recycled.
Switching Power MOSFET Losses
When selecting MOSFETs for switching, consider the
total gate charge, power dissipation, the maximum
drain-to-source voltage, and package thermal imped-
ance. The product of the MOSFET gate charge and
R DS(ON) is a figure of merit, with a lower number signi-
fying better performance. Select MOSFETs optimized
for high-frequency switching applications.
Layout Recommendations
C F ≥
( V OUT ? V INMIN ) × 2 × I OUT
Δ V R × V OUT × f SW
Typically, there are two sources of noise emission in a
switching power supply: high di/dt loops and high dv/dt
surfaces. For example, traces that carry the drain cur-
rent often form high di/dt loops. Similarly, the heatsink
where I OUT is the output current.
In a buck-boost configuration, the output capacitance,
C F , is calculated as:
of the MOSFET connected to the device drain presents a
high dv/dt source; therefore, minimize the surface area of
the heatsink as much as possible. Keep all PCB traces
carrying switching currents as short as possible to mini-
C F ≥
2 × V OUT × I OUT
Δ V R × ( V OUT + V INMIN ) × f SW
mize current loops. Use ground planes for best results.
______________________________________________________________________________________
23
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MAX16816EVKIT+ 功能描述:LED 照明开发工具 MAX16816 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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MAX16818ATI+T 功能描述:LED照明驱动器 1.5MHz 30A w/Rapid LED Current Pulsing 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
MAX16818ETI+ 功能描述:LED照明驱动器 1.5MHz 30A w/Rapid LED Current Pulsing 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
MAX16818ETI+T 功能描述:LED照明驱动器 1.5MHz 30A w/Rapid LED Current Pulsing 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