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| 型号： | MAX16816ATJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/33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： | 是 |
| 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 |
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Programmable Switch-Mode LED Driver
with Analog-Controlled PWM Dimming
= R
R UV1 UV2 x ? ?
Detailed Description
The MAX16816 is a current-mode PWM LED driver for
use in driving HB LEDs. An output current accuracy of
5% is achievable using two current regulation loops:
one current regulation loop controls the external switch-
ing MOSFET peak current through a sense resistor,
R SENSE , from SNS+ to SNS- while the other current reg-
ulation loop controls the average LED string current
through the sense resistor, R CS , in series with the
LEDs. The wide operating supply range of 5.9V/5.4V
(ON/OFF) to 76V makes the MAX16816 ideal in auto-
motive applications.
The MAX16816 provides LED binning through one pro-
grammable on-chip nonvolatile EEPROM. The LED cur-
rent can be scaled up to a factor of 1.6. This feature is
used to offset factory LED luminance variations and
allows the system to achieve overall luminance accuracy.
A programmable undervoltage lockout (UVEN) ensures
predictable operation during brownout conditions. The
UVEN input circuitry monitors the supply voltage, V CC ,
and turns the driver off when V CC drops below the
UVLO threshold. Connect UVEN to V CC to use the 5.7V
(typ) default UVLO threshold. The MAX16816 includes
a cycle-by-cycle current limit that turns off the gate
drive to the external switching MOSFET (Q S ) during an
overcurrent condition and a programmable oscillator
that simplifies and optimizes the design of external
magnetics.
The MAX16816 is capable of synchronizing to an
external clock or operating in a stand-alone mode. A
single resistor, R T , can be used to adjust the switching
frequency from 125kHz to 500kHz for stand-alone
operation. To synchronize the device with an external
clock, apply a clock signal directly to the RTSYNC
input. A buffered clock output, CLKOUT, is available to
configure the MAX16816 for multichannel applications.
The external RT oscillator can be disabled by setting
EEPROM register RTOF to ‘1’.
ered to the load during severe fault conditions. A non-
latching overvoltage protection limits the voltage on the
external switching MOSFET (Q S ) under open-circuit
conditions in the LED string. During continuous opera-
tion at high input voltages, the power dissipation of the
MAX16816 could exceed the maximum rating and the
internal thermal shutdown circuitry safely turns off the
MAX16816 when the device junction temperature
exceeds +165°C. When the junction temperature drops
below the hysteresis temperature, the MAX16816 auto-
matically reinitiates startup.
Undervoltage Lockout/Enable (UVEN)
The MAX16816 features a dual-purpose adjustable
undervoltage lockout input and enable function
(UVEN). Connect UVEN to V CC through a resistive volt-
age-divider to set the undervoltage lockout (UVLO)
threshold. The device is enabled when the voltage at
UVEN exceeds the 1.244V (typ) threshold. Drive UVEN
to ground to disable the output.
Setting the UVLO Threshold
Connect UVEN directly to V CC to select the default 5.7V
(typ) UVLO threshold. Connect UVEN to V CC through a
resistive voltage-divider to select a UVLO threshold
(Figure 1). Select the desired UVLO threshold voltage,
V UVLO , and calculate resistor values using the following
equation:
? V UVEN ?
? V UVLO - V UVEN ?
where R UV1 + R UV2 ≤ 270k Ω . V UVEN is the 1.244V (typ)
UVEN threshold voltage.
V IN
The MAX16816 provides wide contrast pulsed dimming
(up to 1000:1) utilizing a separate dimming input. Apply
either a DC level voltage or low-frequency PWM signal
to the dimming input. DC level input results in a 200Hz
fixed dimming frequency.
R UV2
V CC
UVEN
MAX16816
The MAX16816 provides configurable on-chip non-
volatile EEPROM features including a programmable
soft-start, load current, external MOSFET gate-driver
supply voltage, blanking time, and slope compensation.
Protection features include peak current limiting, HICCUP
mode current limiting, output overvoltage protection,
short-circuit protection, and thermal shutdown. The
C UVEN
R UV1
QGND
HICCUP current-limit circuitry reduces the power deliv-
Figure 1. Setting the UVLO Threshold
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
| MAX16818ATI+ | 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 |
| 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 |
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