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Linear Technology DC1780A-A Demo Manual

Linear Technology DC1780A-A Demo Manual

Ltm4620ev: high efficiency, polyphase 50a step-down power µmodule regulator
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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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Summary of Contents for Linear Technology DC1780A-A

  • Page 1 The board L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and PolyPhase are registered allows the user to program how its output voltage ramps up trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
  • Page 2: Performance Summary

    DC1780A-A DC1780A-B 100A DC1780A-C Demonstration circuit DC1780A-A is easy to set up to 3. Turn on the power supply at the input. Place JP2 to evaluate the performance of PolyPhase operation of the ON position. The output voltage between V –...
  • Page 3 DEMO MANUAL DC1780A-A QUICK START PROCEDURE 6. (Optional) LTM4620 can be synchronized to an external 8. (Optional) DC1780A-A can be configured to a dual clock signal. Place the JP1 jumper on EXT_CLK and outputs configuration with V at 37A load current...
  • Page 4 DEMO MANUAL DC1780A-A QUICK START PROCEDURE = 5V, V = 2.5V = 12V, V = 2.5V = 5V, V = 1.8V = 12V, V = 1.8V = 5V, V = 1.5V = 12V, V = 1.5V = 12V, V = 1.2V = 5V, V = 1.2V...
  • Page 5 DEMO MANUAL DC1780A-A QUICK START PROCEDURE Figure 7. Thermal Capture at 12V , 1.0V at 50A (Ambient Temperature = 23.3°C, No Airflow and No Heat Sink) Figure 8, Thermal Capture at 12V , 1.0V at 50A (Ambient Temperature = 23.3°C, 200LFM Airflow and No Heat Sink) dc1780aafa Arrow.com.
  • Page 6: Parts List

    DEMO MANUAL DC1780A-A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN3, CIN4, CIN5, CIN6, CIN7, CIN8, CIN9, CIN10 Cap., X5R 22μF 25V 10% 1210 Murata GRM32ER61226KE15 COUT1, COUT7, COUT11, COUT15, Cap., X5R 100μF 10V 20% 1210...
  • Page 7: Part Description

    DEMO MANUAL DC1780A-A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER COUT2, COUT3, COUT8, COUT9, CIN12, COUT13, Cap., 1210 CIN13, COUT14, CIN14, CIN15, COUT16, CIN16, COUT17, CIN17, CIN18, CIN19, COUT20, COUT21, COUT22, COUT26, COUT27, COUT28, COUT30, COUT32, COUT33, COUT34, COUT35, COUT36 (OPT)
  • Page 8 DEMO MANUAL DC1780A-A SCHEMATIC DIAGRAM dc1780aafa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 9 DEMO MANUAL DC1780A-A SCHEMATIC DIAGRAM dc1780aafa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 10 DEMO MANUAL DC1780A-A SCHEMATIC DIAGRAM dc1780aafa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 11 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 12 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.

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Ltm4620ev