Texas Instruments LM5175RHF QFN, Руководство пользователя

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A COM
Ammeter
Electronic Load
+ -
V
Voltmeter 1
COM V
Voltmeter 2
COM
+ -
Power Supply
-s +s
Test Setup and Procedure
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6 SNVU518 – April 2016
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LM5175RHF (QFN) EVM User Guide
3.3.5 SYNC Input
The LM5175RHFEVM-HD provides a test point for applying a synchronization (SYNC) input signal. The
free-running switching frequency is set at 400 kHz by resistor RT1. However, the converter aligns in
frequency and phase with that of the applied SYNC signal up to 600 kHz. If required, apply an external
SYNC signal with a frequency higher than the internal free-running frequency as per the LM5175 device
datasheet.
4 Test Setup and Procedure
Figure 3 shows the recommended test setup to evaluate the LM5175RHFEVM-HD. Working at an ESD
workstation, make sure that any wrist straps, boot straps or mats are connected referencing the user to
earth ground before power is applied to the EVM.
Figure 3. Test Setup Connection Diagram