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| 型号： | ZXLD1366ET5TA |
| 厂商： | Diodes Inc |
| 文件页数： | 5/30页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 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，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 500kHz |
| 电源电压： | 6 V ~ 60 V |
| 输出电压： | 60V |
| 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 ~ 125°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD1366E5DKR ZXLD1366E5DKR-ND |
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A Product Line of
Diodes Incorporated
ZXLD1366
Device Description
The device, in conjunction with the coil (L1) and current sense resistor (R S ), forms a self-oscillating continuous-mode buck converter.
Device Operation
(refer to Figure 1 - Block diagram and Figure 2 Operating waveforms).
V IN
LX voltage
0V
V IN
Toff
Ton
SENSE voltage
Coil current
230mV
170mV
200mV
V SENSE-
V SENSE+
I OUTnom +15%
I OUTnom
I OUTnom -15%
0V
Comparator
input voltage
Comparator
V ADJ
5V
0.15V ADJ
0.15V ADJ
output
0V
Figure 2 Theoretical Operating Waveforms
Operation can be best understood by assuming that the ADJ pin of the device is unconnected and the voltage on this pin (V ADJ ) appears
directly at the (+) input of the comparator.
When input voltage V IN is first applied, the initial current in L1 and R S is zero and there is no output from the current sense circuit. Under this
condition, the (-) input to the comparator is at ground and its output is high. This turns MN on and switches the LX pin low, causing current to
flow from V IN to ground, via R S , L1 and the LED(s). The current rises at a rate determined by V IN and L1 to produce a voltage ramp (V SENSE )
across R S . The supply referred voltage V SENSE is forced across internal resistor R1 by the current sense circuit and produces a proportional
current in internal resistors R2 and R3. This produces a ground referred rising voltage at the (-) input of the comparator. When this reaches
the threshold voltage (V ADJ ), the comparator output switches low and MN turns off. The comparator output also drives another NMOS switch,
which bypasses internal resistor R3 to provide a controlled amount of hysteresis. The hysteresis is set by R3 to be nominally 15% of V ADJ .
When MN is off, the current in L1 continues to flow via D1 and the LED(s) back to V IN . The current decays at a rate determined by the LED(s)
and diode forward voltages to produce a falling voltage at the input of the comparator. When this voltage returns to V ADJ , the comparator
output switches high again. This cycle of events repeats, with the comparator input ramping between limits of V ADJ ± 15%.
Switching Thresholds
With V ADJ = V REF , the ratios of R1, R2 and R3 define an average V SENSE switching threshold of 200mV (measured on the I SENSE pin with
respect to V IN ). The average output current I OUTnom is then defined by this voltage and R S according to:
I OUTnom = 200mV/R S
Nominal ripple current is ±30mV/R S
ZXLD1366
Document number: DS31992 Rev. 8 - 2
5 of 30
www.diodes.com
October 2013
? Diodes Incorporated
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相关代理商/技术参数 |
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|---|---|
| ZXLD1370 | 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 |
| ZXLD1370_11 | 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 |
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| ZXLD1370EST16TC | 功能描述:LED照明驱动器 6V TO 60V 11uA 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 |
| 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 |
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