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LTC1174CN8

更新时间： 2024-02-22 01:42:21
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
16页 354K
描述
High Efficiency Step-Down and Inverting DC/DC Converter

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LTC1174CN8 数据手册

 浏览型号LTC1174CN8的Datasheet PDF文件第4页浏览型号LTC1174CN8的Datasheet PDF文件第5页浏览型号LTC1174CN8的Datasheet PDF文件第6页浏览型号LTC1174CN8的Datasheet PDF文件第8页浏览型号LTC1174CN8的Datasheet PDF文件第9页浏览型号LTC1174CN8的Datasheet PDF文件第10页 
LTC1174  
LTC1174-3.3/LTC1174-5  
U
(Refer to Functional Diagram)  
OPERATIO  
circuitry is shut off, reducing quiescent current from  
wheretOFF =4µsandVD isthevoltagedropacrossthediode.  
0.45mAto0.13mA.Whentheoutputcapacitordischarges Note that the operating frequency is a function of the input  
by the amount of the hysteresis of the comparator A1, the and ouput voltage.  
P-channel switch turns on again and the process repeats  
itself.  
Although the size of the inductor does not affect the fre-  
quency, it does affect the ripple current. The peak-to-peak  
ripple current is given by:  
Operating Frequency and Inductor  
Since the LTC1174 utilizes a constant off-time architecture,  
itsoperatingfrequencyisdependentonthevalueofVIN.The  
frequency of operation can be expressed as:  
V
OUT + VD  
I
RIPPLE = 4 ×10−6  
A
P−P  
(
)
L
By choosing a smaller inductor, a low ESR output filter  
capacitorhastobeused(seeCIN andCOUT).Moreover,core  
losswill also increase(seeInductor CoreSelection section)  
due to higher ripple current.  
V − VOUT  
1
tOFF  
IN  
f =  
Hz  
( )  
V + V  
IN  
D
O U  
S
W
U
PPLICATI  
I FOR ATIO  
A
100  
Inductor Core Selection  
CTX100-4  
90  
With the value of L selected, the type of inductor must be  
chosen. Basically there are two kinds of losses in an  
inductor, core and copper  
CTX100-4P  
80  
Core losses are dependent on the peak-to-peak ripple  
current and the core material. However it is independent of  
the physical size of the core. By increasing the inductance  
the inductor’s peak-to-peak ripple current will decrease,  
therefore reducing core loss. Utilizing low core loss mate-  
rial, such as molypermalloy or Kool Mµwill allow users to  
concentrate on reducing copper loss and preventing satu-  
ration.Figure1showstheeffectofdifferentcorematerialon  
the efficiency of the LTC1174. The CTX core is Kool Mµand  
the CTXP core is powdered iron (material 52).  
70  
V
V
PGM  
= 5V  
60  
50  
IN  
= 3.3V  
IN  
OUT  
I
= V  
1
10  
100  
500  
LOAD CURRENT (mA)  
100  
90  
80  
70  
60  
50  
CTX50-4  
CTX50-4P  
Although higher inductance reduces core loss, it increases  
copperlossasitrequiresmorewindings.Whenspaceisnot  
a premium larger gauge wire can be used to reduce the wire  
resistance. This also prevents excessive heat dissipation.  
V
= 5V  
IN  
OUT  
V
= 3.3V  
CIN  
I
= V  
PGM  
IN  
In continuous mode the source current of the P-channel  
MOSFETisasquarewaveofdutycycleVOUT/VIN.Toprevent  
large voltage transients, a low ESR input capacitor sized for  
1
10  
100  
500  
LOAD CURRENT (mA)  
1174 F01  
Figure 1. Efficiency Using Different Types of  
Inductor Core Material  
7
1...45678910...16

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