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| 型号： | ZXLD1350ET5TA |
| 厂商： | Diodes Inc |
| 文件页数： | 5/22页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| 产品培训模块： | ZXLD1350 |
| 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： | ZXLD1350ET5DKR |
A Product Line of
Diodes Incorporated
ZXLD1350
30V 350mA LED DRIVER with AEC-Q100
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 block diagram and Figure 1 - 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 RS 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 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 100mV (measured on the
I SENSE pin with respect to V IN ). The average output current I OUTnom is then defined by this voltage and Rs according to:
I OUTnom =100mV/R S
Nominal ripple current is ±15mV/R S
Adjusting output current
The device contains a low pass filter between the ADJ pin and the threshold comparator and an internal current limiting
resistor (200k nom) between ADJ and the internal reference voltage. This allows the ADJ pin to be overdriven with either
DC or pulse signals to change the V SENSE switching threshold and adjust the output current. The filter is third order,
comprising three sections, each with a cut-off frequency of nominally 4kHz.
Details of the different modes of adjusting output current are given in the applications section.
Output shutdown
The output of the low pass filter drives the shutdown circuit. When the input voltage to this circuit falls below the threshold
(0.2V nom), the internal regulator and the output switch are turned off. The voltage reference remains powered during
shutdown to provide the bias current for the shutdown circuit. Quiescent supply current during shutdown is nominally
15mA and switch leakage is below 1mA.
ZXLD1350
Document number: DS33468 Rev. 8 - 2
5 of 22
www.diodes.com
March 2011
? Diodes Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD1352ET5TA | IC LED DRIVER HIGH BRIGHT TSOT-5 |
| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1350ET5TA-CUT TAPE | 制造商:DIODES 功能描述:ZXLD1350 Series 350 mA 1 MHz SMT LED Driver with Internal Switch - TSOT-23-5 |
| ZXLD1350EV3 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:circuit diagram and bill of materials |
| ZXLD1352 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:350mA LED driver with internal switch and enhanced PWM dimming range |
| ZXLD1352ET5TA | 功能描述:LED照明驱动器 350mA, 30V 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 |
| 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 |
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