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Linear Technology DC2253A Demo Manual
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Linear Technology DC2253A Demo Manual

Ltc3789egn 300w 2-phase interleaved synchronous buck-boost converter
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Description
Demonstration circuit 2253A is a high power, high ef-
ficiency, 2-phase interleaved synchronous buck-boost
converter with a 6V to 36V input range. It can supply a
25A maximum load current with a 12V output. This demo
board features 2x LTC3789EGN controllers.
The
LTC
3789
is a high performance current-mode
®
buck-boost switching regulator controller that operates
from input voltages above, below or equal to the output
voltage, while an output current feedback loop provides
support for output current limit and battery charging. With
a wide 4V to 38V (40V maximum) input and output range
and seamless, low noise transitions between operating
regions, the LTC3789 is ideal for automotive, telecom and
battery-powered systems.
performance summary
PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Maximum Output Current, I
OUT
Typical Output Ripple
Typical Efficiency
Typical Switching Frequency
Synchronous Buck-Boost Converter
The light load operating mode of the controller is de-
termined through the MODE/PLLIN pin. By default, the
forced continuous mode (CCM) operation is pre-selected
on this demo board. Switching frequency is preset at
about 200kHz. Two paralleling schemes are available for
this demo board and by default the method of shared I
pins is adopted. Please refer to the Quick Start Procedure
section for the optional Master-Slave paralleling scheme.
To shut down the converter, force the RUN pin below 1.2V
(JP1: OFF) Please refer to LTC3789 data sheet for more
detailed information.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2253A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at T
CONDITION
V
= 6V to 36V, I
= 0A to 25A
IN
OUT
V
= 6V to 36V, V
= 12V
IN
OUT
V
= 36V, I
= 25A (20MHz BW)
IN
OUT
V
= 12V, I
= 25A (20MHz BW)
IN
OUT
V
= 6V, I
= 25A (20MHz BW)
IN
OUT
V
= 12V, V
= 12V, I
= 25A, see Figure 3
IN
OUT
OUT
DEMO MANUAL DC2253A
300W 2-Phase Interleaved
= 25°C
A
LTC3789EGN
TH
VALUE
6V to 36V
12V ±2%
25A
36mV
P-P
200mV
P-P
380mV
P-P
97.8%
200kHz
dc2253af
1

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Summary of Contents for Linear Technology DC2253A

  • Page 1 LTC3789 is ideal for automotive, telecom and http://www.linear.com/demo/DC2253A battery-powered systems. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. performance summary Specifications are at T = 25°C...

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC2253A Quick start proceDure Demonstration circuit 2253A is easy to set up to evaluate Optional Master-Slave Paralleling Scheme the performance of the LTC3789EGN. Refer to Figure 1 Besides the default paralleling scheme by tying the I pins for the proper measurement equipment setup and follow...
  • Page 3 DEMO MANUAL DC2253A Quick start proceDure Figure 1. Proper Measurement Equipment Setup – Figure 2. Measuring Output Voltage Ripple dc2253af...
  • Page 4 DEMO MANUAL DC2253A Quick start proceDure ±2% LOAD CURRENT (A) TOTAL OUTPUT CURRENT (A) DC2253A F03 DC2253A F04 Figure 3. Efficiency vs Load Current (V = 12V, CCM) Figure 4. Output Current Sharing (V = 6V, V = 12V) ±1.4% ±3.7%...
  • Page 5 DEMO MANUAL DC2253A Quick start proceDure Figure 7. Thermal Performance (V = 12V, V = 12V, 25A Load, No Air Flow) Figure 8. Thermal Performance (V = 6V, V = 12V, 25A Load, 200LFM) dc2253af...
  • Page 6 DEMO MANUAL DC2253A Quick start proceDure Figure 9. Thermal Performance (V = 36V, V = 12V, 25A Load, 200LFM) dc2253af...

  • Page 7: Parts List

    DEMO MANUAL DC2253A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CC1, CC4 CAP., C0G, 100pF, 50V, 10% 0603 AVX, 06035A101KAT2A CC2, CC3 CAP., X7R, 0.01µF, 50V, 10% 0603 AVX, 06035C103KAT2A CSS1, C15, C39, C61, CSS CAP., X7R, 0.1µF, 50V, 10% 0603...
  • Page 8 DEMO MANUAL DC2253A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER RFB3, RFB4 R28, R29, R60, R61 RES., 1206, OPTIONAL R7, R50 RES., CHIP., 100k, 0.1W, 1% 0603 YAGEO, RC0603FR-07100KL RES., CHIP., 10Ω, 0.1W, 5% 0603 YAGEO, RC0603JR-0710RL R26, R55 RES., CHIP., 10Ω, 0.1W, 5% 0805...

  • Page 9: Schematic Diagram

    DEMO MANUAL DC2253A schematic Diagram dc2253af...
  • Page 10 DEMO MANUAL DC2253A schematic Diagram dc2253af...
  • 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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