參數(shù)資料
型號(hào)： LTC3611EWP
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 10 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC64
封裝： 9 X 9 MM, PLASTIC, QFN-64
文件頁數(shù)： 9/26頁
文件大小： 411K
代理商： LTC3611EWP
LTC3611
3611fd
Efciency Considerations
The percent efciency of a switching regulator is equal to
the output power divided by the input power times 100%.
It is often useful to analyze individual losses to determine
what is limiting the efciency and which change would
produce the most improvement. Although all dissipative
elements in the circuit produce losses, four main sources
account for most of the losses in LTC3611 circuits:
1. DC I2R losses. These arise from the resistance of the
internalresistanceoftheMOSFETs,inductorandPCboard
traces and cause the efciency to drop at high output
currents. In continuous mode the average output current
ows through L, but is chopped between the top and bot-
tom MOSFETs. If the two MOSFETs have approximately
the same RDS(ON), then the DC I2R loss for one MOSFET
can simply be determined by [RDS(ON) + RL] IO.
2. Transition loss. This loss arises from the brief amount
of time the top MOSFET spends in the saturated region
during switch node transitions. It depends upon the
input voltage, load current, driver strength and MOSFET
capacitance, among other factors. The loss is signicant
at input voltages above 20V and can be estimated from:
Transition Loss
(1.7A–1) VIN2 IOUT CRSS f
ApplicAtions inForMAtion
3. INTVCC current. This is the sum of the MOSFET driver
and control currents. This loss can be reduced by sup-
plying INTVCC current through the EXTVCC pin from a
high efciency source, such as an output derived boost
network or alternate supply if available.
4. CINloss.Theinputcapacitorhasthedifcultjobofltering
the large RMS input current to the regulator. It must have
a very low ESR to minimize the AC I2R loss and sufcient
capacitance to prevent the RMS current from causing ad-
ditional upstream losses in fuses or batteries.
Other losses, including COUT ESR loss, Schottky diode D1
conduction loss during dead time and inductor core loss
generally account for less than 2% additional loss.
Whenmakingadjustmentstoimproveefciency,theinput
current is the best indicator of changes in efciency. If
you make a change and the input current decreases, then
the efciency has increased. If there is no change in input
current, then there is no change in efciency.
Checking Transient Response
The regulator loop response can be checked by looking
at the load transient response. Switching regulators take
several cycles to respond to a step in load current. When
a load step occurs, VOUT immediately shifts by an amount
equal to ΔILOAD (ESR), where ESR is the effective series
resistance of COUT. ΔILOAD also begins to charge or dis-
chargeCOUTgeneratingafeedbackerrorsignalusedbythe
regulator to return VOUT to its steady-state value. During
this recovery time, VOUT can be monitored for overshoot
or ringing that would indicate a stability problem. The ITH
pin external components shown in Figure 6 will provide
adequate compensation for most applications. For a
detailed explanation of switching control loop theory see
Application Note 76.
Figure 5. RUN/SS Pin Interfacing with Latchoff Defeated
3.3V OR 5V
RUN/SS
VIN
INTVCC
RUN/SS
D1
(5a)
(5b)
D2*
CSS
RSS*
CSS
*OPTIONAL TO OVERRIDE
OVERCURRENT LATCHOFF
RSS*
3611 F05
2N7002
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