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| 型号： | MAX16831ATJ+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/19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
The MAX16831 features a differential high-side level
shifter to drive an external n-channel MOSFET for dim-
ming. Wide contrast “pulsed” dimming (1000:1) is pos-
V IN
sible by applying either a low-frequency PWM input
signal or a DC voltage to the dimming input (DIM).
R UV2
V CC
Protection features include peak current limiting,
HICCUP mode current limiting, output overvoltage pro-
tection, short-circuit protection, and thermal shutdown.
C UVEN
R UV1
UVEN
MAX16831
R UV 1 = R UV 2 × ?
The HICCUP current-limit circuitry reduces the power
delivered to the load during severe fault conditions.
Nonlatching 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
MAX16831 could exceed the maximum rating and an
internal thermal shutdown circuitry safely turns off the
MAX16831 when the device junction temperature
exceeds +165°C. When the junction temperature drops
below the hysteresis temperature, the MAX16831 auto-
matically re-initiates startup.
Undervoltage Lockout/Enable
The MAX16831 features a dual-purpose adjustable
UVLO input and enable function. Connect UVEN to V CC
through a resistive voltage-divider to set the undervolt-
age lockout (UVLO) threshold. The MAX16831 is
enabled when the UVEN exceeds the 1.244V (typ)
threshold. Drive UVEN to ground to disable the output.
Setting the UVLO Threshold
The MAX16831 features a programmable UVLO thresh-
old. Connect UVEN directly to V CC to select the default
6.0V (max) UVLO threshold. Connect UVEN to V CC
through a resistive voltage-divider to select a UVLO
threshold (Figure 1). Calculate resistor values as follows:
? V UVEN ?
?
? V UVLO - V UVEN ?
where R UV1 + R UV2 ≤ 270k ? , V UVEN is the 1.244V (typ)
threshold voltage, and V UVLO is the desired UVLO
threshold in volts at V CC (Figure 1).
The capacitor, C UVEN , is required to prevent chattering
at the UVLO threshold due to line impedance drops
during power-up and dimming. If the undervoltage set-
ting is very close to the required minimum operating
voltage, then there can be jumps in the voltage at V CC
during dimming, which may cause the MAX16831 to
turn on and off when the dimming signal transitions
from low to high. The capacitor, C UVEN , should be
10
QGND
Figure 1. Setting the UVLO Threshold
large enough to limit the ripple on UVEN to less than
the 100mV (min) UVEN hysteresis so that the device
does not turn off under these circumstances.
Soft-Start
The MAX16831 includes a factory-set 4ms (typ) soft-
start delay that allows the load current to ramp up in a
controlled manner, minimizing output overshoot. Soft-
start begins once the device is enabled and V CC
exceeds the UVLO threshold. Soft-start circuitry slowly
increases the internal soft-start voltage, V SS , resulting
in a controlled rise of the load current. Signals applied
to DIM are ignored until the soft-start duration is com-
plete and a successive delay of 200μs has elapsed.
Internal Regulators
The MAX16831 includes a fixed 5V voltage regulator
REG1, a 7V voltage regulator REG2, and an internal 8V
regulator CLMP. REG1 and REG2 power up when V CC
exceeds the UVLO threshold. REG1 supplies power to
internal circuitry and remains on during PWM dimming.
It is capable of driving external loads up to 2mA.
REG2 is capable of delivering up to 20mA of current.
Connect REG2 to DRI to generate the supply voltage
for the primary switching MOSFET driver, DRV.
CLMP is powered by HI and supplies power to the cur-
rent-sense amplifier (CSA). CSA is enabled when
V CLMP goes 2.5V above V LO and is disabled when
(V CLMP - V LO ) falls below 2.28V. The CLMP regulator
also provides power to the dimming MOSFET control
circuitry. CLMP is the output of the CLMP regulator. Do
not use CLMP to power external circuitry. Bypass
CLMP to LO with a 0.1μF ceramic capacitor. A larger
capacitor will result in overshoots of the load current.
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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