NQ15W50SGA30 Datasheet, PDF (9/11 Pages) SynQor Worldwide Headquarters – SMT Surface Mount

Technical Specification
Input: 6.0 - 15.0V
Outputs: 0.8 - 5.0V
Current: 30A
Package: SMT
Over-Temperature Shutdown:A temperature sensor on the
converter senses the average temperature of the module. The ther-
mal shutdown circuit is designed to turn the converter off when the
temperature at the sensed location reaches the Over-Temperature
Shutdown value.It will allow the converter to turn on again when
the temperature of the sensed location falls by the amount of the
Over-Temperature Shutdown Restart Hysteresis value.
APPLICATION CONSIDERATIONS
Input Filtering/Capacitance/Damping:The filter circuit of
Figure E is often added to the converter’s input to prevent switch-
ing noise from reaching the input voltage bus.
Figure E: converter with Input Filter
In the SGA30 (surface mount) converters Cin = 20µF of high
quality ceramic capacitors. With Lin of 1µH, Cd should be
100-200µF and Rd should be 0.1-0.2W, in most applications.
For more information on designing the input filter and choosing
proper values, contact SynQor technical support.
Adding significant external pure ceramic capacitance directly
across the converter’s input pins is not recommended. Parasitic
inductance associated with the input pin geometry and PCB traces
can create a high-Q CLC circuit with any external capacitors.Just
a few nano-Henries of parasitic inductance can create a resonance
(or an overtone) near the converter’s switching frequency. To
avoid this high-frequency resonance, any external input filter
should exhibit a net source impedance of at least 20mW resistive
through this frequency range. This requirement is easily met with
the damping elements discussed above. Adding a small amount (a
few µF) of high-frequency external ceramic will not violate it.
If using converters at higher powers, consider the ripple current
rating of Cd. Contact SynQor technical support for details.
Output Capacitance:It is recommended to add at least 100µF
of capacitance, with an ESR in the 0.1W range, to the output of
the SGA30 series of converters.In many applications, however,
additional external output capacitance is required to reduce the
response to load transients to an allowable level.
For minimal overshoot upon recovery, Cd should be related to the
minimum in-circuit net ESR.
For more detailed derivations of these values contact SynQor
technical support.
Figure H: Converter with Additional Output Capacitance
Active Load Sharing:For additional power requirements, the
SGA30 series of converters have a parallel feature available.To
implement forced load sharing, the following connections should
be made:
• The share pins of all units in parallel must be connected
together. The path of these connections should be as direct as
possible.
• All ON/OFF pins should be connected together.
The share bus is not designed for redundant operation and the
system will be non-functional upon failure of one of the units when
multiple units are in parallel. When not using the parallel feature,
leave the share pin open.
SURFACE MOUNT INFORMATION
PCB Layout Considerations: SynQor recommends that
the customer use a non-solder mask defined pad design. The
minimum recommended pad size is 0.074” x 0.122” (1.88mm
x 3.1mm) and the maximum pad size is 0.095” x 0.140”
(2.41mm x 3.56mm), see the mechanical diagram on page 2.
Interconnection to internal power planes is typically required.
This can be accomplished by placing a number of vias between
the SMT pad and the relevant plane. The number and location
of the vias should be determined based on electrical resistance,
current and thermal requirements.“Via-in-pad” design should be
avoided in the SMT pads. Solder mask should be used to elimi-
nate solder wicking into the vias.
Pick and Place: The NiQor surface mount modules are
designed for automated assembly using standard SMT pick and
place equipment. The modules have a centrally located inductor
component with a flat surface area to be used for component
pick-up. The units use open frame construction and have a low
mass that is within the capability of standard pick and place
equipment. Those modules however have a larger mass than most
conventional SMT components and so variables such as nozzle
size, tip style, handling speed, and placement pressure should be
optimized for best results.A conformal tipped placement nozzle
design is recommended. Coplanarity of better than 0.004”
(0.1mm) is achieved through the SMT NiQor’s terminal design.
Product # NQ15W50SGA30
Phone [phone]
www.synqor.com
Doc.# 005-2NS163E Rev. C
10/03/08
Page 9