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| 型号： | ZXLD1370EST16TC |
| 厂商： | Diodes Inc |
| 文件页数： | 16/39页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HIGH BRIGHT TSSOP-16 |
| 特色产品： | ZXLD1370 High Accuracy LED Driver |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 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，通用 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 300kHz ~ 1MHz |
| 电源电压： | 6 V ~ 60 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD1370EST16TCDKR |
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A Product Line of
Diodes Incorporated
ZXLD1370
Application Information (cont.)
Therefore the average LED current is the coil current multiplied by the schottky diode duty cycle, 1-D.
? GI _ ADJ ? V ADJ ?
I LED = I RS ( 1 ? D ) = ? ?
? R S ?
? V REF ?
? 0 . 225 ? ? ?
? ? ?
(Boost and Buck-Boost)
Equation 4
This shows that the LED current depends on the ADJ pin voltage, the reference voltage and 3 resistor values (RS, RGI1 and RGI2). It is
independent of the input and output voltages.
If the ADJ pin is connected to the REF pin, this simplifies to
I LED = ? ?
? 0 . 225 ?
? GI _ ADJ
? R S ?
?
(Boost and Buck-Boost)
Now I LED is dependent only on the 3 resistor values.
Considering power dissipation and accuracy, it is useful to know how the mean sense voltage varies with input voltage and other parameters.
? ? ?
? ?
? GI _ ADJ ? ? V ADJ ?
V RS = I RS = 0 . 225 ?
? ? V REF ?
? 1 ? D
(Boost and Buck-Boost)
Equation 5
This shows that the sense voltage varies with duty cycle in Boost and Buck-Boost configurations.
Application Circuit Design
External component selection is driven by the characteristics of the load and the input supply, since this will determine the kind of topology being
used for the system. Component selection begins with the current setting procedure, the inductor/frequency setting and the MOSFET selection.
Finally after selecting the freewheeling diode and the output capacitor (if needed), the application section will cover the PWM dimming and
thermal feedback. The full procedure is greatly accelerated by the web Calculator spreadsheet, which includes fully automated component
selection, and is available on the Diodes web site. However the full calculation is also given here.
Some components depend upon the switching frequency and the duty cycle. The switching frequency is regulated by the ZXLD1370 to a large
extent, depending upon conditions. This is discussed in a later paragraph dealing with coil selection.
Duty Cycle Calculation and Topology Selection
The duty cycle is a function of the input and output voltages. Approximately, the MOSFET switching duty cycle is
D BUCK ≈
V OUT
V IN
for Buck
D BOOST ≈
V OUT ? V IN
V OUT
for Boost
Equation 6
D BB ≈
V OUT
V OUT + V IN
for Buck-Boost
Because D must always be a positive number less than 1, these equations show that
V OUT < V IN
V OUT > V IN
V OUT > or = or < V IN
for Buck (voltage step-down)
for Boost (voltage step-up)
for Buck-boost (voltage step-down or step-up)
This allows us to select the topology for the required voltage range.
ZXLD1370
Document number: DS32165 Rev. 5 - 2
16 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1371 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER-CONTROLLER |
| ZXLD1371EST16TC | 功能描述:MOSFET LED Controller TSSOP TSSOP-16EP T&R 2.5K RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
| ZXLD1371QESTTC | 功能描述:MOSFET LED Controller TSSOP TSSOP-16EP T&R 2.5K RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
| ZXLD1374 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST |
| ZXLD1374_11 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST |
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