參數(shù)資料
型號(hào)： LTC3816EFE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO38
封裝： LEAD FREE, PLASTIC, TSSOP-38
文件頁(yè)數(shù)： 28/44頁(yè)
文件大?。?/td> 753K
代理商： LTC3816EFE#TRPBF
LTC3816
3816f
applicaTions inForMaTion
QB
D
COUT
3816 F19
L
QT
VIN
VBAT
12V
VOUT
TG
BG
BSOURCE
LTC3816
SW
+
Figure 19. Automotive Application Protection
and operating frequency. Given a specified limit for ripple
current, the inductor value can be obtained using the fol-
lowing equation:
L
V
f
I
V
OUT
OSC
L MAX
OUT
IN MAX
=
–
(
)
(
)
1
Once the value for L is known, the type of inductor must
be selected. High efficiency converters generally cannot
afford the core loss found in low cost powdered iron cores,
forcing the use of more expensive ferrite cores. Ferrite
designs have very low core loss and are thus preferred
at high switching frequencies. Ferrite core materials
saturate hard, which means that inductance collapses
abruptly when the peak design current is exceeded. This
results in an abrupt increase in inductor ripple current and
consequent output voltage ripple. Do not allow the core to
saturate! A variety of inductors designed for high current,
low voltage applications are available from manufacturers
such as Vishay, Sumida, Pulse, Wurth Elektronik, Vitec
and Toko.
AUTOMOTIVE CONSIDERATIONS
Before you connect an LTC3816 converter to an automo-
tive cigarette lighter supply, be advised: you are plugging
into the supply from hell. The main battery line in an
automobile is the source of a number of nasty potential
transients, including load dump, reverse battery and
double battery.
Load dump is the result of a loose battery cable. When the
cable breaks connection, the field collapse in the alterna-
tor can cause a positive spike as high as 60V which takes
several hundred milliseconds to decay. Reverse battery is
just what it says, while double battery is a consequence of
tow truck operators finding that a 24V jump start cranks
cold engines faster than 12V.
ThenetworkshowninFigure19isthemoststraightforward
approach to protect a DC/DC converter from the ravages
of an automotive battery line. The series diode prevents
current from flowing during reverse battery, while the
transient suppressor clamps the input voltage during
load dump. Note that the transient suppressor should not
conduct during double-battery operation, but must still
clamp the input voltage below breakdown of the converter.
Although the IC has a maximum input voltage of 40V on
the SW pins, most applications will be limited to 30V by
the MOSFET BVDSS.
CHECKING TRANSIENT RESPONSE
For all new LTC3816 PCB circuits, transient tests need to
be performed to verify the proper feedback loop operation.
The regulator loop response can be checked by looking at
the load current transient response. Switching regulators
take several cycles to respond to a step in DC (resistive)
load current. When a load step occurs, VOUT shifts by an
amount equal to
VAVP. ILOAD also begins to charge or
discharge COUT generating the feedback error signal that
forces the regulator to adapt to the current change and
return VOUT to its steady-state value. During this recovery
time VOUT can be monitored for excessive overshoot or
ringing, which would indicate a stability problem.
Measuring transient response presents challenges in two
respects:obtaininganaccuratemeasurementandgenerat-
ing a suitable transient to use to test the circuit. Output
measurementsshouldbetakenwithascopeprobedirectly
acrosstheoutputcapacitor.Properhighfrequencyprobing
techniques should be used. In particular, don’t use the 6"
groundleadthatcomeswiththeprobe!Useanadapterthat
fits on the tip of the probe and has a short ground clip to
ensure that inductance in the ground path doesn’t cause
a bigger spike than the transient signal being measured.
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