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| 型号： | MAX16816ATJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 22/33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
Fault Protection
The MAX16816 features built-in overvoltage protection,
overcurrent protection, HICCUP mode current-limit pro-
tection, and thermal shutdown. Overvoltage protection
is achieved by connecting OV to HI through a resistive
voltage-divider. HICCUP mode limits the power dissi-
pation in the external MOSFETs during severe fault
conditions. Internal thermal shutdown protection safely
turns off the converter when the IC junction temperature
exceeds +165°C.
Overvoltage Protection
The overvoltage protection (OVP) comparator com-
pares the voltage at OV with a 1.235V (typ) internal ref-
erence. When the voltage at OV exceeds the internal
reference, the OVP comparator terminates PWM
switching and no further energy is transferred to the
load. The MAX16816 reinitiates soft-start once the over-
voltage condition is removed. Connect OV to HI
through a resistive voltage-divider to set the overvolt-
age threshold at the output.
Setting the Overvoltage Threshold
Connect OV to HI or to the high-side of the LEDs
through a resistive voltage-divider to set the overvolt-
age threshold at the output (Figure 4). The overvoltage
protection (OVP) comparator compares the voltage at
OV with a 1.235V (typ) internal reference. Use the fol-
lowing equation to calculate resistor values:
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 ( Δ I L ). Higher Δ I L
allows for a lower inductor value while a lower Δ 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 capacitor. On the other
hand, higher inductance increases efficiency by reduc-
ing the ripple current, Δ 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
Δ 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-
mum peak current limit.
Buck configuration: In a buck configuration the average
inductor current does not vary with the input. The worst-
case peak current occurs at high input voltage. In this
case the inductance, L, for continuous conduction
mode is given by:
R OV1 OV2 x ?
?
= R
? V OV ?
? V OV_LIM ? V OV ?
L =
V OUT x ( V INMAX ? V OUT )
V INMAX x f SW x Δ I L
where V OV is the 1.235V OV threshold. Choose R OV1
and R OV2 to be reasonably high value resistors to pre-
vent discharge of filter capacitors. This will prevent
unnecessary undervoltage and overvoltage conditions
during dimming.
Load-Dump Protection
where V INMAX is the maximum input voltage, f SW is the
switching frequency, and V OUT is the output voltage.
The MAX16816 features load-dump protection up to 76V.
LED drivers using the MAX16816 can sustain single fault
load dump events. Repeated load dump events within
very short time intervals can cause damage to the dim-
V LED+
R OV1
MAX16816
ming MOSFET due to excess power dissipation.
OV
Thermal Shutdown
The MAX16816 contains an internal temperature sensor
R OV2
AGND
that turns off all outputs when the die temperature
exceeds +165°C. Outputs are enabled again when the
die temperature drops below +145°C.
Figure 4. Setting the Overvoltage Threshold
22
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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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