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dc2641af

DEMO MANUAL DC2641A

DESCRIPTION

LTC7801EUFD

High Input Voltage

Synchronous Buck Converter

Demonstration circuit 2641A is a single output synchro-

nous buck converter featuring the LTC7801EUFD in the

24-lead QFN package. The input voltage range is from

16V to 100V and the output is 12V/10A. The DC2641A is

configured with a sense resistor for overcurrent protec-

tion. Inductor DCR current sensing is optional.

The board has a lot of features including an optional

onboard NMOS LDO for DRVCC, a switch-mode power

operation in dropout, a mode selector pin that allows

the converter to run in CCM, pulse-skip, adjustable burst

L

, LT, LTC, LTM, Linear Technology, Burst Mode, PolyPhase and the Linear logo are registered

trademarks of Analog Devices, Inc. All other trademarks are the property of their respective

owners.

PERFORMANCE SUMMARY

The LTC7801 data sheet gives a complete description

of the part, operation and application information and

must be read in conjunction with this demo manual for

DC2641A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2641A

PARAMETER

CONDITIONS

VALUE

Input Voltage Range

16V ~ 100V

12V ± 2% (11.76V ~ 12.24V)

10A

Default Operating Frequency (Typical)

150kHz

External Clock Sync. Frequency Range

75kHz – 850kHz

Typical Full Load Efficiency (See Figure 4)

95.3%