參數(shù)資料
型號(hào)： LTC3108IGN-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO12
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 1593K
代理商： LTC3108IGN-1#PBF
LTC3108-1
31081f
at times when the input power may be lost. Note that this
capacitor can charge all the way to 5.25V (regardless of
the settings for VOUT), so ensure that the holdup capacitor
has a working voltage rating of at least 5.5V at the tem-
perature for which it will be used. The VSTORE capacitor
can be sized using the following:
C
A I
I
t f
TSTORE
STORE
Q
LDO
BURST
≥
+ +
+
6
5
(
)
..25
VOUT
Where 6A is the quiescent current of the LTC3108-1, IQ
is the load on VOUT in between bursts, ILDO is the load on
the LDO between bursts, IBURST is the total load during
the burst, t is the duration of the burst, f is the frequency
of the bursts, TSTORE is the storage time required and
VOUT is the output voltage required.
To minimize losses and capacitor charge time, all capaci-
tors used for VOUT and VSTORE should be low leakage.
See Table 6 for recommended storage capacitors.
Table 6. Recommended Storage Capacitors
VENDOR
PART NUMBER/SERIES
AVX
www.avx.com
BestCap Series
TAJ and TPS Series Tantalum
Cap-XX
www.cap-xx.com
GZ Series
Cooper/Bussmann
www.bussmann.com/3/PowerStor.html
KR Series
P Series
Vishay/Sprague
www.vishay.com/capacitors
Tantamount 592D
595D Tantalum
150CRZ/153CRV Aluminum
013 RLC (Low Leakage)
Storage capacitors requiring voltage balancing are not
recommended due to the current draw of the balancing
resistors.
PCB Layout Guidelines
Due to the rather low switching frequency of the resonant
converter and the low power levels involved, PCB layout
is not as critical as with many other DC/DC converters.
There are, however, a number of things to consider.
Due to the very low input voltage the circuit may operate
from,theconnectionstoVIN,theprimaryofthetransformer
and the SW and GND pins of the LTC3108-1 should be
designed to minimize voltage drop from stray resistance
and able to carry currents as high as 500mA. Any small
voltage drop in the primary winding conduction path will
lower efficiency and increase capacitor charge time.
Also,duetothelowchargecurrentsavailableattheoutputs
of the LTC3108-1, any sources of leakage current on the
output voltage pins must be minimized. An example board
layout is shown in Figure 3.
applicaTions inForMaTion
Figure 3. Example Component Placement for
Two-Layer PC Board (DFN Package)
31081 FO3
VOUT2
VOUT
VIN
VIAS TO GROUND PLANE
VLDO
PGOOD
GND
12
11
8
9
10
4
5
3
2
1
VOUT2_EN
VS1
VS2
SW
C2
C1
VOUT
VOUT2
VLDO
PGD
VAUX
VSTORE
6
7
相關(guān)PDF資料
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參數(shù)描述
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