參數(shù)資料
型號(hào)： LTC3616IUDD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 13.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 3 X 5 MM, LEAD FREE, PLASTIC, QFN-24
文件頁(yè)數(shù)： 6/28頁(yè)
文件大?。?/td> 490K
代理商： LTC3616IUDD#TRPBF
LTC3616
14
3616fa
applicaTions inForMaTion
Frequency Synchronization
The LTC3616’s internal oscillator can be synchronized to
an external frequency by applying a square wave clock
signaltotheRT/SYNCpin.Duringsynchronization,thetop
switch turn-on is locked to the falling edge of the external
frequency source. The synchronization frequency range
is 300kHz to 4MHz. During synchronization all operation
modes can be selected.
It is recommended that the regulator is powered down
(RUN pin to ground) before removing the clock signal
on the RT/SYNC pin in order to reduce inductor current
ripple.
AC coupling should be used if the external clock genera-
tor cannot provide a continuous clock signal throughout
start-up, operation and shutdown of the LTC3616. The
size of capacitor CSYNC depends on parasitic capacitance
on the RT/SYNC pin and is typically in the range of 10pF
to 22pF.
Inductor Selection
For a given input and output voltage, the inductor value
and operating frequency determine the ripple current. The
ripple current IL increases with higher VIN and decreases
with higher inductance:
IL =
VOUT
fSW L
1–
VOUT
VIN
Having a lower ripple current reduces the core losses
in the inductor, the ESR losses in the output capacitors
and the output voltage ripple. A reasonable starting point
for selecting the ripple current is IL = 0.3 IOUT(MAX).
The largest ripple current occurs at the highest VIN. To
guarantee that the ripple current stays below a specified
maximum, the inductor value should be chosen according
to the following equation:
L =
VOUT
fSW IL(MAX)
1–
VOUT
VIN
The inductor value will also have an effect on Burst Mode
operation. The transition to low current operation begins
whenthepeakinductorcurrentfallsbelowalevelsetbythe
burst clamp. Lower inductor values result in higher ripple
current which causes this to occur at lower load currents.
Thiscausesadipinefficiencyintheupperrangeoflowcur-
rent operation. In Burst Mode operation, lower inductance
values will cause the burst frequency to increase.
Inductor Core Selection
Once the value for L is known, the type of inductor must be
selected. Actual core loss is independent of core size for
fixed inductor value, but it is very dependent on the induc-
tanceselected.Astheinductanceincreases,corelossesde-
crease.Unfortunately,increasedinductancerequiresmore
turns of wire and therefore, copper losses will increase.
LTC3616
SVIN
VIN
RT/SYNC
LTC3616
SVIN
VIN
0.4V
RT/SYNC
RT
SGND
LTC3616
SVIN
fOSC
2.25MHz
fOSC
1/TP
fOSC ∝1/RT
VIN
RT/SYNC
SGND
TP
1.2V
0.3V
LTC3616
SVIN
fOSC
1/TP
VIN
CSYNC
RT/SYNC
SGND
3616 F02
Figure 2. Setting the Switching Frequency
相關(guān)PDF資料
PDF描述
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LTC3617EUDD#TRPBF 功能描述:IC REG SYNC 6A BUCK 24QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專(zhuān)用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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