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| 型号： | ZXLD1937ET5TA |
| 厂商： | Diodes Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| 产品变化通告： | End of Life 16/Sept/2011 |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 1MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 28V |
| 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 ~ 85°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD1937ET5DKR |
LAST TIME BUY
Closest Alternative is AP5724WUG-7
ZXLD1937
Inductor selection
The choice of inductor will depend on available board
space as well as required performance. Small value
inductors have the advantage of smaller physical size
and may offer lower series resistance and higher
saturation current compared to larger values. A
disadvantage of lower inductor values is that they result
in higher frequency switching, which in turn causes
reduced efficiency due to switch losses. Higher inductor
values can provide better performance at lower supply
voltages. However, if the inductance is too high, the
output power will be limited by the internal oscillator,
which will prevent the coil current from reaching its
peak value. This condition will arise whenever the ramp
time (I LX(peak) x L/V IN ) exceeds the nominal 5 s
maximum 'on' time limit for the LX output.
The graphs opposite show the ZXLD1937 performance
for given inductor values and different manufacturers.
Recommended inductor values for the ZXLD1937 are
in the range 6.8 H to 22 H. The inductor should be
mounted as close to the device as possible with low
resistance connections to the LX and VIN pins.
Suitable coils for use with the ZXLD1937 are shown in
the table below:
Part No.
CMD4D11-100MC
L
( H)
10
DCR
( )
0.457
I SAT
(A)
0.5
Manufacturer
Sumida
www.sumida.com
DO1608-103
10
0.16
1.1
Coilcraft
www.coilcraft.com
LQH31CN100
10
1.3
0.23
Murata
www.murata.com
LB2012Y100MR
10
0.5
0.1
Taiyo Yuden
www.t-yuden.co
Diode selection
The rectifier diode (D1) should be a fast low
capacitance schottky diode with low reverse leakage at
the working voltage. It should also have a peak current
rating above the peak coil current and a continuous
current rating higher than the maximum output load
current.
The table below gives some typical characteristics for
diodes that can be used with the ZXLD1937:
Layout considerations
PCB tracks should be kept as short as possible to
minimise ground bounce, and the ground pin of the
device should be soldered directly to the ground plane.
It is particularly important to mount the coil and the
input/output capacitors close to the device to minimise
parasitic resistance and inductance, which will
degrade efficiency. The FB pin is a high impedance
input so PCB track lengths to this should also be kept as
short as possible to reduce noise pickup. Excess
capacitance from the FB pin to ground should be
avoided.
Diode
ZHCS400
ZHCS500
V F @ 100mA (mV)
300
300
I FSM (mA)
1000
1000
Ic (mA)
400
500
I R at 30V ( A)
15
15
Package
SOD323
SOT23
ISSUE 1 - JULY 2004
11
SEMICONDUCTORS
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD381FHTA | IC LED DRIVR WHITE BCKLT SOT23-3 |
| ZXLD383ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| ZXSC300E5TA | IC LED DRVR WHITE BCKLGT SOT23-5 |
| ZXSC380FHTA | IC LED DRVR WHITE BCKLGT SOT23-3 |
| ZXSC400E6TA | IC LED DRVR WHITE BCKLGT SOT23-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1937ET5TC | 制造商:Diodes Incorporated 功能描述: |
| ZXLD300 | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:SENS HEAD RFLCTV SPOT BEAM 300MM 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:DIFFUSE RFLCT SPOT BEAM 300mm |
| ZX-LD300 | 功能描述:光电传感器 DIFFUSE RFLCT SPOT BEAM 300mm RoHS:否 制造商:Omron Industrial 感应方式:Retroreflective 感应距离:2 m 光源:Infrared LED 放大器类型: 连接:Prewired Cable 输出配置:Light ON |
| ZXLD300L | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:SENS HEAD RFLCTV LINE BEAM 300MM 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:DIFFUSE RFLCT LINE BEAM 300mm |
| ZX-LD300L | 功能描述:光电传感器 DIFFUSE RFLCT LINE BEAM 300mm RoHS:否 制造商:Omron Industrial 感应方式:Retroreflective 感应距离:2 m 光源:Infrared LED 放大器类型: 连接:Prewired Cable 输出配置:Light ON |
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