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| 型号： | ZXLD1371QESTTC |
| 厂商： | Diodes Inc |
| 文件页数： | 28/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER |
| 特色产品： | ZXLD1371 LED Driver Controller |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | ZXLD1371QESTTCDIDKR |
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A Product Line of
Diodes Incorporated
ZXLD1371
Applications Information (cont.)
The ZXLD1371 sets the ripple current, Δ I L , to between nominally 10% and 30% of the mean coil current, I COIL , which is found
from Equation 8 . The device adjusts the ripple current within this range in order to regulate the switching frequency. We
therefore need to use a Δ I L value of 20% of I COIL to find an inductance which is optimized for the input voltage range. The
range of ripple current control is also modulated by other circuit parameters as follows.
? I LMAX =
? I LMIN =
? I LMID =
0.06 +0.24
0.02 +0.08
0.04 +0.16
V ADJ
V REF
V ADJ
V REF
V ADJ
V REF
1-D
GI_ADJ
1-D
GI_ADJ
1-D
GI_ADJ
I COIL
I COIL
I COIL
Equation 20
If ADJ is connected to REF, this simplifies to
GI_ADJ COIL
? I LMAX = 0.3
1-D
I
GI_ADJ COIL
GI_ADJ COIL
? I LMIN = 0.1
? I LMID = 0.2
1-D
1-D
I
I
Equation 20a
where Δ I LMID is the value we must use in Equation 18 . We have now established the inductance value.
The chosen coil should saturate at a current greater than the peak sensed current. This saturation current is the DC current
for which the inductance has decreased by 10% compared to the low current value.
Assuming ±10% ripple current, we can find this peak current from Equation 8 , adjusted for ripple current:
I COILPEAK = 1.1 I LED
for Buck
I COILPEAK = 1.1 I INMAX
I COILPEAK = 1.1 I INMAX + I LED
for Boost
for Buck-boost
Equation 21
where I INMAX is the value of I IN at minimum V IN .
The mean current rating is also a factor, but normally the saturation current is the limiting factor.
The following websites may be useful in finding suitable components
www.coilcraft.com
www.niccomp.com
www.wuerth-elektronik.de
MOSFET Selection
The ZXLD1371 requires an external NMOS FET as the main power switch with a voltage rating at least 15% higher than
the maximum circuit voltage to ensure safe operation during the overshoot and ringing of the switch node. The current
rating is recommended to be at least 10% higher than the average transistor current. The power rating is then verified by
calculating the resistive and switching power losses.
P = P resistive + P switching
Resistive power losses
The resistive power losses are calculated using the RMS transistor current and the MOSFET on-resistance.
Calculate the current for the different topologies as follows:
Buck mode
I MOSFETMAX = I LED
Boost / Buck-boost mode
I MOSFETMAX =
I LED
1 ? D MAX
ZXLD1371
Document number: DS35436 Rev. 1 - 2
28 of 42
www.diodes.com
February 2012
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1374 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST |
| ZXLD1374_11 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST |
| ZXLD1374EST20TC | 功能描述:LED照明驱动器 60V 1.5A BUCK/BOOST LED DRIVER AEC-Q100 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 |
| ZXLD1601 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH IN SC70 |
| ZXLD1601H6 | 制造商:Diodes Incorporated 功能描述:LCD/OLED BIAS BOOST CONVERTER SMD |
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