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ZXLD1362ET5TA PDF预览

ZXLD1362ET5TA

更新时间： 2024-01-27 10:08:10
品牌 Logo 应用领域
捷特科 - ZETEX 显示驱动器驱动程序和接口开关接口集成电路光电二极管PC
页数 文件大小 规格书
32页 867K
描述
1A LED driver with internal switch

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ZXLD1362ET5TA 技术参数

是否Rohs认证：符合生命周期：Transferred
包装说明：TSOT-23, 5 PINReach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.35Is Samacsys：N
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：R-PDSO-G5
JESD-609代码：e3长度：2.9 mm
湿度敏感等级：1复用显示功能：NO
功能数量：1区段数：1
端子数量：5最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：VSSOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH认证状态：Not Qualified
座面最大高度：1 mm最大供电电压：60 V
最小供电电压：6 V标称供电电压：24 V
表面贴装：YES温度等级：AUTOMOTIVE
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：0.95 mm端子位置：DUAL
宽度：1.6 mmBase Number Matches：1

ZXLD1362ET5TA 数据手册

 浏览型号ZXLD1362ET5TA的Datasheet PDF文件第3页浏览型号ZXLD1362ET5TA的Datasheet PDF文件第4页浏览型号ZXLD1362ET5TA的Datasheet PDF文件第5页浏览型号ZXLD1362ET5TA的Datasheet PDF文件第7页浏览型号ZXLD1362ET5TA的Datasheet PDF文件第8页浏览型号ZXLD1362ET5TA的Datasheet PDF文件第9页 
ZXLD1362  
Device description  
The device, in conjunction with the coil (L1) and current sense resistor (R ), forms a self-  
S
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  
) appears directly at the (+) input of the comparator.  
ADJ  
When input voltage V is first applied, the initial current in L1 and R is zero and there is no  
IN  
S
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 to ground, via R , L1 and the LED(s). The current rises at a rate determined by V  
IN  
S
IN  
is  
and L1 to produce a voltage ramp (V  
) across R . The supply referred voltage V  
SENSE  
S
SENSE  
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  
), the comparator output switches  
ADJ  
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 . The current  
IN  
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  
, the comparator output switches  
ADJ  
high again. This cycle of events repeats, with the comparator input ramping between limits of  
15%.  
V
ADJ  
Switching thresholds  
With V  
100mV (measured on the I  
= V , the ratios of R1, R2 and R3 define an average V  
switching threshold of  
ADJ  
REF  
SENSE  
pin with respect to V ). The average output current I  
is  
SENSE  
IN  
OUTnom  
then defined by this voltage and R according to:  
S
I
= 100mV/R  
S
OUTnom  
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 (50k⍀ 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  
switching threshold and adjust the output current.  
SENSE  
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 60␮A and switch  
leakage is below 5␮A.  
Provisional version B - July 2007  
© Zetex Semiconductors plc 2007  
6
www.zetex.com  
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