Linear Technology DC1780A-C Demo Manual

DESCRIPTION
Demonstration circuit 1780A-C features poly phase design
®
using the LTM 4620EV, the high efficiency, high 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-C can
deliver nominal 100A output current with 4× LTM4620s
in parallel. As explained in the data sheet, output current
derating is necessary for certain V
conditions. The LTM4620 on DC1780A-C always operates
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 volt-
BOARD PHOTO
DEMO MANUAL DC1780A-C
, V , and thermal
IN OUT
Figure 1. 100A PolyPhase LTM4620/DC1780A-C Demo Board
LTM4620EV: High Efficiency,
PolyPhase 100A Step-Down
Power µModule
age is tightly regulated between V
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
this demo manual prior to working on or modifying the
demo circuit DC1780A-C.
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 through
OUT OUT
dc1780acfa
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