RT2872GSP Datasheet, PDF (3/11 Pages) Richtek Technology Corporation – RT2872 Step-Down Converter Evaluation Board

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Evaluation Board
RT2872GSP
Evaluation Board
Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components
are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to
[e-mail]
Test Points
The EVB is provided with the test points and pin names listed in the table below.
Test point/Pin name
Signal
Comment (expected waveforms or voltage levels on test points)
VIN
Input voltage
Input voltage range = 4.5V to 36V
VOUT
Output voltage
Default output voltage = 3.3V
Output voltage range = 0.8V to 30V
(see ‘’ Output Voltage Setting’’ section for changing output voltage
level)
SW
Switch Node
SW waveform
Enable signal. EN is automatically pulled high (by R4) to enable
EN
Chip Enable Operation
operation. Connect EN low to disable operation.
BOOT
Boot strap supply test point
Floating supply voltage for the high-side N-MOSFET switch
MODE
RT test point
Switch frequency setting point
GND
Ground
Ground
Power-up & Measurement Procedure
1. Apply a 12V nominal input power supply (4.5V < V_IN < 36V) to the VIN and GND terminals.
2. The EN voltage is pulled to logic high by R4 (100kΩ to VIN) to enable operation. Drive EN high (>2.0V) to
enable operation or low (<0.4V) to disable operation.
3. Verify the output voltage (approximately 3.3V) between VOUT and GND.
4. Connect an external load up to 3A to the VOUT and GND terminals and verify the output voltage and
current.
EVB_RT2872GSP-00 June 2015
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