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| 型号： | ZXLD1370EST16TC |
| 厂商： | Diodes Inc |
| 文件页数： | 29/39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.)
Thermal Control of LED Current
For thermal control of the LEDs, the ZXLD1370 monitors the voltage on the TADJ pin and reduces output current if the voltage on this pin falls
below 625mV. An external NTC thermistor and resistor can therefore be connected as shown below to set the voltage on the TADJ pin to
625mV at the required temperature threshold. This will give 100% LED current below the threshold temperature and a falling current above it as
shown in the graph. The temperature threshold can be altered by adjusting the value of Rth and/or the thermistor to suit the requirements of the
chosen LED.
The Thermal Control feature can be disabled by connecting TADJ directly to REF.
Here is a simple procedure to design the thermal feedback circuit:
1) Select the temperature threshold T threshold at which the current must start to decrease
2) Select the Thermistor TH1 (both resistive value at +25°C and beta)
3) Select the value of the resistor R th as R th = TH at T threshold
Figure 34 Thermal Feedback Network
The thermistor resistance, R T , at a temperature of T degrees Kelvin is given by
1 ? ?
? 1
? T T ?
e ?
R T = R R
B ? ?
R ?
Where
R R is the thermistor resistance at the reference temperature, T R
T R is the reference temperature, in Kelvin, normally 273 + 25 = 298K (+25°C)
B is the “beta” value of the thermistor.
For example,
1) Temperature threshold T threshold = 273 + 70 = 343K (+70°C)
2) TH1 = 10k ? at +25°C and B = 3900
R T = 1.8k ? @ +70°C
3) R th = R T at T threshold = 1.8k ?
Over-Temperature Shutdown
The ZXLD1370 incorporates an over-temperature shutdown circuit to protect against damage caused by excessive die temperature. A warning
signal is generated on the STATUS output when die temperature exceeds +125°C nominal and the output is disabled when die temperature
exceeds +150°C nominal. Normal operation resumes when the device cools back down to +125°C.
ZXLD1370
Document number: DS32165 Rev. 5 - 2
29 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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相关代理商/技术参数 |
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| 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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