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Board Configuration
6
Board Configuration
6.1
Interleaved Buck Operation for Single 3.3V 16A Output
The evaluation board is designed to be easily converted to a 3.3V, 16A single output regulator with the
interleaved operation. Proper electronic load connection is shown in
Figure 8
. Connecting the electronic
load at the center of shorting bar is recommended to prevent a voltage difference between CH1 and CH2
output. In order to produce a single 3.3V output with 16A maximum output current, populate R21 and R22
with 0
Ω
resistor and open R6, C15 and C14. The electronic load should have over 16A capability to test
the interleaved operation.
Figure 8. Load Connection for Single Output
6.2
External VCC Supply and VCC Disable
External VCC supply helps to reduce the temperature and the power loss of the LM25119 at high input
voltage. By populating D3 and D4, VCC can be supplied from an external power supply. Use TP3 as an
input of the external VCC supply with 0.1A current limit. R36, R35 and C45 should be populated with
proper value when the voltage of the external VCC is smaller than 7V. The voltage at the VCCDIS pin can
be monitored at TP2. To prevent a reverse current flow from VCC to VIN through the internal diode, the
external VCC voltage should always be lower than VIN.
7
SNVA445B – August 2010 – Revised April 2013
AN-2066 LM25119 Evaluation Board
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