DESCRIPTION
Demonstration circuit 1780A-A features PolyPhase
design using the LTM
density, dual 13A, switch mode step-down power module
regulator. The input voltage is from 4.5V to 16V. The
output voltage is jumper selectable from 1.0V to 2.5V.
DC1780A-A can deliver nominal 50A output current with 2×
LTM4620s in parallel. As explained in the data sheet, output
current derating is necessary for certain V
thermal conditions. The LTM4620 on DC1780A-A always
operate in continuous conduction mode. The switching
frequency can be programmed through a resistor or can
be synchronized to an external clock signal. The board
allows the user to program how its output voltage ramps up
and down through the TRACK_CONTROL pin. The output
Arrow.com.
Downloaded from
®
4620EV, the high efficiency, high
, V
IN
OUT
Figure 1. 50A PolyPhase LTM4620/DC1780A-A Demo Board
DEMO MANUAL DC1780A-A
LTM4620EV: High Efficiency,
PolyPhase 50A Step-Down
Power µModule
®
voltage is tightly regulated between "V
through remote output voltage sensing which improves
output voltage regulation at heavy loads. These features
and the availability of the LTM4620EV in a compact 15mm
× 15mm × 4.41mm LGA package make it ideal for use in
many high-density point-of-load regulation applications.
The LTM4620 data sheet must be read in conjunction with
, and
this demo manual prior to working on or modifying the
demo circuit DC1780A-A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and PolyPhase are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Regulator
®
+
–
" and "V
"
OUT
OUT
dc1780aafa
1
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