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DESCRIPTION
Demonstration circuit 1928A is a single output synchronous
buck converter featuring the
4mm x 4mm QFN package.
The DC1928A is configured with a sense resistor. Inductor
DCR sensing circuit is optional. Using the inductor's DCR
as the sense element instead of the onboard sense resistor
saves cost, board space while improving efficiency. Using
a sense resistor provides more accurate current limit.
The board has a lot of features including an internal 5V
linear regulator for bias, output voltage remote-sense,
programmable nonlinear control to improve load tran-
sient performance, programmable thermal shutdown, an
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Default Operating Frequency (Typical)
External Clock Sync. Frequency Range
Typical Full Load Efficiency (See Figure 3)
Arrow.com.
Downloaded from
LTC
3867EUF
in a 24-lead
®
Specifications are at T
CONDITIONS / NOTES
V
= 18V ~ 36V, I
IN
OUT
V
= 24V, V
= 12V, I
IN
OUT
DEMO MANUAL DC1928A
High Efficiency Synchronous
optional temperature compensated DCR sense circuit,
and selectable continuous, pulse-skipping or Burst Mode
operation. Synchronization to an external clock is also
possible.
The input voltage range is from 18V to 36V. The LTC3867
data sheet gives a complete description of the part, opera-
tion and application information and must be read in con-
junction with this demo manual for DC1928A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
= 25°C
A
VALUE
18V ~ 36V
= 0A ~ 12A, JP3: CCM
12V ±2% (11.76V ~ 12.24V)
250kHz
200kHz to 780kHz
= 12A, f
= 250kHz 97.6%
OUT1
SW
LTC3867EUF
Buck Converter
®
dc1928af
1
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Related Manuals for Linear Technology DC1928A
Summary of Contents for Linear Technology DC1928A
- Page 1 L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective sient performance, programmable thermal shutdown, an owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1928A QUICK START PROCEDURE Demonstration circuit DC1928A is easy to set up to evalu- Once the proper output voltage is established, adjust the ate the performance of the LTC3867EUF. Please refer to load within the operating range and observe the output... - Page 3 DEMO MANUAL DC1928A QUICK START PROCEDURE Figure 2. Measuring Input or Output Ripple Across Terminals or Directly Across Bulk Capacitor PULSE-SKIPPING BURST LOAD Figure 3. Measured Efficiency RAIL TRACKING Demonstration circuit 1928A is configured for an onboard can also be modified to track an external reference. Refer soft-start circuit.
-
Page 4: Parts List
DEMO MANUAL DC1928A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1 CAP, ALUM, 56µF 20% 50V SUN ELECT 50HVH56M CIN3, CIN6 CAP, X5R 10µF 20% 50V 1210 TAIYO YUDEN UMK325BJ106MM-T COUT1, COUT2 CAP, POSCAP 150µF 20% 16V 7343... -
Page 5: Schematic Diagram
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 6 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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