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L3010L-S08-T PDF预览

L3010L-S08-T

更新时间: 2024-01-22 01:03:51
品牌 Logo 应用领域
友顺 - UTC 驱动器输入元件高功率电源
页数 文件大小 规格书
5页 150K
描述
1A HIGH POWER LED DRIVER WITH 4.5~40V INPUT

L3010L-S08-T 数据手册

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L3010  
Preliminary  
LINEAR INTEGRATED CIRCUIT  
„
FUNCTION DESCRIPTION  
The UTC L3010 is a current mode and fixed frequency (280kHz) LED driver.  
1. Output current setting  
The output current is determined by the sampling resistor (RS) and setting voltage (VIN-VSENSE a built-in fixed  
88mV).  
VIN VSENSE  
IOUT  
=
=88mV/Rs  
RS  
2. Current limiting  
UTC L3010 has internal current limiting function, and the voltage on COMP is clamped at about 2V, the output  
current of the power MOSFET is limited at about 2.1A by current comparator.  
„
COMPONENTS SELECTION  
1. Input Capacitor Selection  
This capacitor should be located close to the IC using short leads. The RMS current rating requirement for the  
input capacitor of a buck regulator is approximately 12 the DC load current. A low ESR input capacitor sized for  
maximum RMS current must be used. It is recommend use the MLCC capacitor of 10μF or larger.  
2. Output Capacitance Selection  
The output capacitor is required to filter the output reduce the ripple current of LED and provide regulator loop  
stability. The important capacitor parameters are; The 100KHz Equivalent Series Resistance (ESR), the RMS ripples  
current rating, voltage rating, and capacitance value. For the output capacitor, the ESR value is the most important  
parameter. It is recommend use the MLCC capacitor of 2.2μF or larger.  
3. Inductance Selection  
For most designs, the operates with inductors of 47μH to 68μH. Where is inductor Ripple Current. Large value  
inductors lower ripple current and small value inductors result in high ripple currents. The DC current rating of the  
inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation.  
In order to improve the efficiency, the series-wound resistor (DCR) of inductance should be smaller than 0.2.  
The inductor value can be derived from the following equation:  
VOUT × (VIN VOUT  
VIN × ΔIL × fOSC  
)
L =  
Where: L: Inductance value  
F: Oscillator frequency  
ΔI is ripple current  
4. Diode Selection  
UTC L3010 driver LED need a Schottky diode. If output current is 700mA or smaller then SS14 (D1N5819) is ok.  
The average current through the diode is ID:  
ID= (1-D)·ILED  
ILED is the current of LED  
UNISONIC TECHNOLOGIES CO., LTD  
4 of 5  
QW-R125-024.a  
www.unisonic.com.tw  

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