參數(shù)資料
型號: LTC3856IUH#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PQCC38
封裝: 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD-X, QFN-32
文件頁數(shù): 28/40頁
文件大?。?/td> 2222K
代理商: LTC3856IUH#TRPBF
LTC3856
3856f
applicaTions inForMaTion
A short-circuit to ground will result in a folded back
current of:
I
mV
ns
V
H
SC =
( )
=
25
3
0 002
1
2
90
5 5
2
4 0
.
. 44A
The worst-case power dissipated by the synchronous
MOSFET under short-circuit conditions at elevated ambi-
ent temperature and estimated 50°C junction temperature
rise is:
P
V
A
SYNC =
(
) ( )
(
)
=
5 5
1 8
5 5
4 04
1 25 0 013
0
2
.
..18W
which is much less than normal, full-load conditions.
Incidentally, since the load no longer dissipates power in
the shorted condition, total system power dissipation is
decreased by over 99%.
ThedutycycleswhenthepeakRMSinputcurrentoccursis
at D = 0.25 and D = 0.75 according to Figure 10. Calculate
the worst-case required RMS input current rating at the
input voltage, which is 5.5V, that provides a duty cycle
nearest to the peak.
From Figure 10, CIN will require an RMS current rating of:
C required I
A
IN
RMS
=
( )( )
=
20 0 23
4 6
.
The output capacitor ripple current is calculated by using
theinductorripplealreadycalculatedforeachinductorand
multiplying by the factor obtained from Figure 8 along with
the calculated duty factor. The output ripple in continuous
mode will be highest at the maximum input voltage. From
Figure 8, the maximum output current ripple is:
I
V
fL
I
kH
COUT
OUT
COUTMAX
=
( )
=
( )
0 34
1 8 0 34
300
.
zz
H
A
(
)
( )
=
2
1
Note that the PolyPhase technique will have its maximum
benefitforinputandoutputripplecurrentswhenthenumber
of phases times the output voltage is approximately equal
to or greater than the input voltage.
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