參數(shù)資料
型號(hào)： LTC3766IUFD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28
文件頁(yè)數(shù)： 47/60頁(yè)
文件大小： 607K
代理商： LTC3766IUFD#TRPBF
LTC3766
51
3766f
APPLICATIONS INFORMATION
The setting of the gate drive timing for a resonant reset
converter is simplified by the adaptive delays featured in
the LTC3766. When standalone mode is active (100k or
50k on MODE), the FGD pin is ignored, and the associated
deadtimebetweenSGturn-offandPGturn-oniscontrolled
adaptively. In this mode, LTC3766 delays the PG turn-on
until after the SG pin has fallen below approximately 0.5V.
For the PG turn-off transition, the SGD resistor is chosen
to minimize the dead time and also prevent collapse of
the SWP node (i.e., catch the SWP voltage at its peak if
possible). Note that setting the FG turn-off so as to catch
the SWP voltage near its peak will improve efficiency
and allow for the use of a larger resonant reset capacitor,
therebyreducingthepeakvoltagestressesontheMOSFETs.
Adaptive delay limiting on this edge ensures that SG will
not go high until SW has fallen, so shoot-through is not
a concern.
Innonisolatedapplications,theinductorcurrentisnormally
sensed on the input side of the power transformer, typi-
cally using a sense resistor. Note that in this situation, the
values for the sense resistor (RSENSE) and the IPK resistor
(RIPK) should be calculated using the above equations,
but then scaled by a factor of NP/NS. For applications
where the transformer is configured to step up the volt-
age, however, it may be more efficient to sense current
on the output side of the power transformer. In this case,
be careful to avoid transformer saturation by keeping the
resonant reset capacitor as small as possible and making
use of the volt-second clamp.
Common Mode Noise
Common mode noise arises in isolated converter applica-
tions due to the parasitic capacitance between the primary
and secondary windings of the main transformer. When
rapid voltage changes occur on the primary-side MOSFET
drain, this will inject current through the inter-winding
capacitance. This causes the ground reference of the
secondary to suddenly jump with respect to the primary
ground. As a result, current is injected across the inter-
winding capacitance of the pulse transformer back to the
primary,andaresultingcommonmodevoltagecanappear
attheIN+andIN–inputsoftheLTC3765.WhiletheLTC3765
has been carefully designed to reject this common mode
voltage, always use a common mode filter capacitor that
is directly connected between the primary and secondary
grounds. This capacitor shunts away the common mode
noise. Typically, a value of 2.2nF is adequate. Use a high
quality ceramic Y capacitor rated for 250VAC operation, or
other voltage rating as needed for the isolation and safety
requirements of the particular application.
Thermal Considerations
When designing a forward converter with an output power
of 50W or more, particular attention must be paid to the
thermal aspects of the design and layout. In general, it is
better to use multiple elements in parallel to spread out the
powerdissipationandreducetemperaturerise.Beneathall
power MOSFETS, use thermal vias and copper islands on
multiplelayerstoprovidecooling.Ifexcessivetemperature
rise occurs, both the LTC3765 and the LTC3766 contain
overtemperatureshutdowncircuitsthatwillhelptoprevent
thermaldamage.Bothovertemperatureshutdownsareset
at approximately 165°C rising with 20°C of hysteresis.
PCB Checklist
The LTC3766 requires proper bypassing on the VCCsupply
due to its high speed switching (nanoseconds) and large
AC currents (Amperes). Careless component placement
and PCB trace routing may cause excessive ringing and
undershoot/overshoot.
To obtain optimum performance from the LTC3766:
1. Use a low inductance, low impedance ground planes
to reduce any ground drop and stray capacitance.
Remember that the LTC3766 switches at greater than
2A peak currents and the power MOSFETs can carry
50A or more. Any significant ground drop will degrade
signal integrity.
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