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| 型号： | MAX16834ATP+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HIGH BRIGHT 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 特色产品： | MAX16834 High-Power LED Driver |
| 标准包装： | 75 |
| 拓扑： | PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB |
| 频率： | 100kHz ~ 1MHz |
| 电源电压： | 4.75 V ~ 28 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
MAX16834
High-Power LED Driver with Integrated High-Side LED
Current Sense and PWM Dimming MOSFET Driver
IL AVG =
I LED
1 ? D MAX
Allowing the peak-to-peak inductor ripple ? I L to be
±30% of the average inductor current:
? I L = IL AVG × 0 . 3 × 2
Allowing the peak-to-peak inductor ripple ( ? I L ) to be
±30% of the average inductor current:
IL P = IL AVG +
? I L
2
? I L = IL AVG × 0 . 3 × 2
The inductance value (L) of the inductor L1 in henries is
calculated as:
and
IL P = IL AVG +
? I L
2
L =
(V INMIN ? V FET ) × D MAX
f SW × ? I L
The inductance value (L) of the inductor L1 in henries
(H) is calculated as:
where f SW is the switching frequency in hertz, V INMIN
and V FET are in volts, and ? I L is in amperes. Choose an
L =
(V INMIN ? V FET ) × D MAX
f SW × ? I L
inductor that has a minimum inductance greater than
the calculated value.
Peak Current-Sense Resistor (R8)
where f SW is the switching frequency in hertz, V INMIN
and V FET are in volts, and ? I L is in amperes.
Choose an inductor that has a minimum inductance
The value of the switch current-sense resistor R8 for the
boost and boost-buck configurations is calculated as
follows:
greater than the calculated value. The current rating of
the inductor should be higher than IL P at the operating
temperature.
R 8 =
0 . 25
( IL P × 1 . 25 )
?
Boost-Buck Configuration
In the boost-buck LED driver (Figure 3), the average
inductor current is equal to the input current plus the
LED current.
Calculate maximum duty cycle using the following
equation:
where 0.25V is the minimum peak current-sense thresh-
old, IL P is the peak inductor current in amperes, and
the factor 1.25 provides a 25% margin to account for
tolerances. The worst cycle-by-cycle current limiter trig-
gers at 350mV (max). The I SAT of the inductor should
be higher than 0.35V/R8.
D MAX =
V LED + V D
V LED + V D + V INMIN ? V FET
Output Capacitor
The function of the output capacitor is to reduce the
output ripple to acceptable levels. The ESR, ESL, and
where V LED is the forward voltage of the LED string in
volts, V D is the forward drop of the rectifier diode D1
(approximately 0.6V) in volts, V INMIN is the minimum
input supply voltage in volts, and V FET is the average
drain to source voltage of the MOSFET Q1 in volts when
it is on. Use an approximate value of 0.2V initially to cal-
culate D MAX . A more accurate value of maximum duty
cycle can be calculated once the power MOSFET is
selected based on the maximum inductor current.
Use the below equations to calculate the maximum
average inductor current IL AVG , peak-to-peak inductor
current ripple ? I L , and the peak inductor current IL P in
amperes:
the bulk capacitance of the output capacitor contribute
to the output ripple. In most applications, the output
ESR and ESL effects can be dramatically reduced by
using low-ESR ceramic capacitors. To reduce the ESL
and ESR effects, connect multiple ceramic capacitors
in parallel to achieve the required bulk capacitance. To
minimize audible noise generated by the ceramic
capacitors during PWM dimming, it may be necessary
to minimize the number of ceramic capacitors on the
output. In these cases an additional electrolytic or tan-
talum capacitor provides most of the bulk capacitance.
Boost and boost-buck configurations: The calcula-
tion of the output capacitance is the same for both
boost and boost-buck configurations. The output ripple
12
IL AVG =
I LED
1 ? D MAX
is caused by the ESR and the bulk capacitance of the
output capacitor if the ESL effect is considered negligi-
ble. For simplicity, assume that the contributions from
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16834ATP/V+ | 功能描述:LED照明驱动器 w/Int Hside Crnt Sns & PWM Dim MOSFET 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 |
| MAX16834ATP/V+CEU | 制造商:Maxim Integrated Products 功能描述:HIGH-POWER LED DRIVER WITH INTEGRATED HIGH-SIDE LED CURRENT - Rail/Tube |
| MAX16834ATP/V+T | 功能描述:LED照明驱动器 w/Int Hside Crnt Sns & PWM Dim MOSFET 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 |
| MAX16834ATP/V+TCEU | 制造商:Maxim Integrated Products 功能描述:HIGH-POWER LED DRIVER WITH INTEGRATED HIGH-SIDE LED CURRENT - Tape and Reel |
| MAX16834ATP+ | 功能描述:LED照明驱动器 w/Int Hside Crnt Sns & PWM Dim MOSFET 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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