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| 型号： | ZXLD1352ET5TA |
| 厂商： | Diodes Inc |
| 文件页数： | 16/21页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HIGH BRIGHT TSOT-5 |
| 特色产品： | LED Driver Solutions |
| 标准包装： | 1 |
| 拓扑： | PWM，降压（降压） |
| 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），白色 LED |
| 频率： | 1MHz |
| 电源电压： | 7 V ~ 30 V |
| 输出电压： | 30V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 105°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD1352ET5DKR |
A Product Line of
Diodes Incorporated
ZXLD1352
Application Information (Continued)
Example
For V IN =12V, L=47 μ H, rL=0.64 Ω , V LED =3.4V, I avg =350mA and VD =0.36V
T ON = (47e-6 x 0.105)/(12 - 3.4 - 0.672) = 0.622 μ s
T OFF = (47e-6 x 0.105)/(3.4 + 0.36 + 0.322)= 1.21 μ s
This gives an operating frequency of 546kHz and a duty cycle of 0.34.
These and other equations
are
available
as
a
spreadsheet
calculator
from
the
Zetex
website.
Go
to
www.diodes.com/ZXLD1352
Note that in practice, the duty cycle and operating frequency will deviate from the calculated values due to dynamic switching
delays, switch rise/fall times and losses in the external components.
Optimum performance will be achieved by setting the duty cycle close to 0.5 at the nominal supply voltage. This helps to
equalize the undershoot and overshoot and improves temperature stability of the output current.
Diode selection
For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance Schottky diode with low reverse
leakage at the maximum operating voltage and temperature. The recommended diode for use with this part is the ZLLS1000.
This has approximately ten times lower leakage than standard Schottky diodes, which are unsuitable for use above 85°C. It
also provides better efficiency than silicon diodes, due to a combination of lower forward voltage and reduced recovery time.
The table below gives the typical characteristics for the ZLLS1000:
Forward Voltage at
Continuous
Reverse Leakage
Diode
ZLLS1000
100mA
(mV)
310
Current
(mA)
1000
At 30V 85oC
( μ A)
300
Package
TSOT23-5
If alternative diodes are used, it is important to select parts with a peak current rating above the peak coil current and a
continuous current rating higher than the maximum output load current. It is very important to consider the reverse leakage of the
diode when operating above 85°C. Excess leakage will increase the power dissipation in the device.
The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will increase the peak voltage on the LX
output. If a silicon diode is used, care should be taken to ensure that the total voltage appearing on the LX pin including supply
ripple, does not exceed the specified maximum value.
ZXLD1352
Document number: DS33469 Rev. 3 - 2
16 of 21
www.diodes.com
December 2010
? Diodes Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD1356DACTC | IC LED DRIVER WHITE BCKLGT 6-DFN |
| ZXLD1360ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| ZXLD1362ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| ZXLD1366DACTC | IC LED DRIVER WHITE BCKLGT 6-DFN |
| ZXLD1370EST16TC | IC LED DRVR HIGH BRIGHT TSSOP-16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1356 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:High accuracy 550mA, 60V LED driver with internal switch |
| ZXLD1356_10 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V 550mA LED DRIVER with AEC-Q100 |
| ZXLD1356DACTC | 功能描述:LED照明驱动器 550mA, 60V LED Drver, Int Swtch 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 |
| ZXLD1356ET5TA | 功能描述:LED照明驱动器 550mA, 60V LED Drver, Int Swtch 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 |
| ZXLD1356QET5TA | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V 550mA LED DRIVER and AUTOMOTIVE GRADE |
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