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参数资料
| 型号： | ZXLD1321DCATC |
| 厂商： | Diodes Inc |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 14-TDFN |
| 特色产品： | LED Driver Solutions |
| 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： | 闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 600kHz |
| 电源电压： | 2 V ~ 12 V |
| 输出电压： | 18V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 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： | ZXLD1321DCADKR |
ZXLD1321
The LED current is sensed by R3 and the controller varies this until the drop in R3 equals 20% of
VADJ. Hence making R3 = 100m ? and VADJ = 500mV gives a LED current of 1 Amp because the
500mV VADJ results in 100mV across R3 which equals 1 Amp. Making VADJ = 10mV gives a LED
current of 100mA because the 50mV VADJ results in 10mV drop across R3 which equals 100mA.
The power is controlled by the chip backing off the peak coil current, so it is necessary to calculate
the coil inductance and current to guarantee slightly more than 100% LED power, so the circuit
can control it effectively. The internal control loop is compensated by C1, which is normally 10nF.
Note that in Bootstrap mode, the input current will be 2 or 3 times larger than the LED current and
the duty cycle will be such that TON is larger than TOFF, due to the fact that the supply voltage
charging the coil is low. Because of this, large LED currents can not be programmed at very low
supply voltages, as the transistor current would need to exceed 2 Amps.
If the thermistor (R5) is used, the power will be backed off progressively as the TADJ pin goes low.
With the TADJ pin above 75mV, power is 100% and this is reduced to zero when the TADJ pin
reaches 50mV. Making R4 = 5k ? and using a 103KT1608 thermistor, the thermistor will reach
869 ? at 105°C giving TADJ = 74mV which will start to reduce the LED power above 105°C. By
125°C the thermistor will reach 547 ? giving TADJ = 50mV which gives zero power. This will
protect the LED from damage. These temperature values can be set by the customer by using a
different thermistor or a different value of R4. If protection is not required, leaving the TADJ pin
open circuit will make it float to a high voltage and always give 100% power.
Reference
U1
D1
L1
Part No
ZXLD1321
ZXCS2000
MSS7341-103ML
Value
LED Driver
Schottky diode
10μH 2A
Manufacturer
Zetex
Zetex
Coilcraft
Contact Details
www.zetex.com
www.coilcraft.co
m
L1
L1
C1
C2
C3
R1
R2
R3
R4
R5
NPIS64D100MTRF
744 777910
Generic
GRM31CR71H475K
GRM31MR71E225K
Generic
Generic
Generic
Generic
Thermistor NTC
10μH 2A
10μH 2A
10nF 10V
4.7μF 50V
2.2μF 25V
25m ?
100m ?
5.1k ?
10k
NIC
Wurth
Generic
Murata 1206
Murata 1206
Generic 0805
Generic 0603
Generic 0805
Generic 0603
103kt1608
www.niccomp
www.wurth.co.uk
www.murata.com
www.murata.com
Issue 1 - January 2008
? Zetex Semiconductors plc 2008
17
www.zetex.com
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD1322DCCTC | IC LED DRIVR WHITE BCKLGT 14-DFN |
| ZXLD1350ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| ZXLD1352ET5TA | IC LED DRIVER HIGH BRIGHT TSOT-5 |
| ZXLD1356DACTC | IC LED DRIVER WHITE BCKLGT 6-DFN |
| ZXLD1360ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1322 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:BUCK/BOOST MODE DC-DC CONVERTER |
| ZXLD1322DCCTC | 功能描述:直流/直流开关转换器 Buck-Boost DC-DC Con 0.7A output RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| ZXLD1322DCCTC-CUT TAPE | 制造商:DIODES 功能描述:ZXLD1322 Series 15 V 600 kHz 700 mA Buck/Boost Mode DC-DC Converter - DFN-14 |
| ZXLD1322DCTC | 制造商:ZETEX 制造商全称:ZETEX 功能描述:Buck/boost mode DC-DC converter for LED driving with 700mA output and current control |
| ZXLD1350 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:350mA LED driver with internal switch |
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