Evaluation platform for RPX-1.5 buck regulator Features module Evaluation Module Thermal design considerations included EMI class B filter Evaluation Easy evaluation of output voltage selection, Module control, and sensing functions RPX-1.5-EVM-1 Description The RPX-1.5-EVM-1 generates a constant output voltage selectable from 0.8V, 1.8V, 3.3V, 5V, 12V, 15V, or 24V from a DC input in the range of 4-36V. It has a maximum continuous output current of 1.5A. All the functions of the RPX-1.5 such as output voltage selection, control, power good, trim, and output sense can be readily evaluated. Also the behavior in overload or over-temperature can be evaluated easily before it is designed in. The evaluation board also contains the filter components to meet EMC class B levels. Alternate component positions are included to allow experimentation to optimize the EMC performance depending on operating conditions and budget. Selection Guide Part Input Voltage Output Output (1) Number Range Voltage Current max. VDC VDC A RPX-1.5-EVM-1 4 - 36 0.8, 1.8, 3.3, 5, 12, 15, 24 1.5 Notes: Note1: refer to SAFE OPERATING AREA of RPX-1.5 datasheet Quick Start Guide 1. Connect P3 to power supply (observe correct polarity ) 2. Connect P4 to the load (no load operation is allowed. For 0.8Vout, please refer to safe operating area in the RPX-1.5 datasheet) 3. The evaluation module is preset to 5Vout. The output voltage can be selected with values of 0.8V, 1.8V, 3.3V, 5V, 12V, 15V, and 24V by shorting a 0W resistor to the respective places as seen in the board silkscreen. For 0.8Vout, please refer to safe operating area in the RPX-1.5 datasheet. 4. The sense pin is connected to the RPX output pin, so the preset voltage is very accurate at the output of the RPX. To compensate any losses of the filter, remove the resistor at R2, and solder a 0W resistor at R3. 5. CTRL The device is preset as normally on. It can be disabled by pulling the CTRL pad to GND. Short R18 to disable the device. Caution: ESD sensitive. Always follow ESD preventative procedures when handling the product www.recom-power.com REV.: 0/2020 P-1 PreliminaryRPX-1.5-EVM-1 Evaluation Module Specifications (measured Ta= 25C, full load and after warm-up unless otherwise stated) Component Placement RPX-1.5-EVM-1 FOR EVALUATION ONLY www.recom-power.com/eval-ref-boards 11 1 P1 P2 C7 C8 C9 C10 GND GND 1 1 P3 P4 C3 C4 C5 C6 C11 1 1 2 2 U1 L1 R4 L2 VIN L7 L3 VOUT R5 2 2 L4 L8 C12 4V to 36V 1.5A max. L5 L9 L6 10 2 9 SENSE VOUT SELECT 3 4 5 6 7 R1 R18 R22 R21 8 PGOOD VIN CTRL GND TRIM SENSE Connector Description P1 (Not Mounted) P3 Pin Name Description Pin Name Description 1 NC No Connection 1 GND Common GND 2 NC No Connection 2 VIN Positive Input Voltage (observe correct polarity ) P4 P2 (Not Mounted) Pin Name Description Pin Name Description 1 GND Common GND 1 NC No Connection 2 NC No Connection 2 VOUT Positive Output Voltage Pads Direct Connection Pin Name Description 1 GND Negative Input Voltage (GND) 2 VIN Positive Input Voltage 3 PGOOD Power Good Signal 4 VIN Positive Input Voltage 5 CTRL CTRL Pad (leave open if not used) 6 GND Negative Input Voltage (GND) 7 TRIM TRIM Pad (leave open if not used) 8, 9 SENSE Output Voltage Sense Pin (leave open if not used) 10 VOUT Positive Output Voltage 11 GND Negative Output Voltage (GND) www.recom-power.com REV.: 0/2020 P-2 Preliminary C1 C2 R20 R11 24V R10 15V R9 12V R8 5V R7 3.3V R6 1.8V 0.8V R2 R3