Power/Voltage Converter Module User Manual
Contents
1. Power Voltage Converter Module For the Raspberry Pi User Manual Q Circuit Surgery www circuitsurgery com Page 1of4 Description This small bare board module is a switch mode power converter based on the LM2576S 5 0 switching regulator is capable of delivering a stable 5 volts at up to 2 5 amps when connected to a suitable power source such as a battery with a voltage of between 8 and 35 volts It is also capable of regulating an alternating voltage such as that from the secondary winding of a low voltage transformer An AC input voltage to the module should be in the range of 7 to 28 volts RMS such that the rectified voltage to the regulator IC does not exceed its maximum voltage rating On Off Switch and Indicator g I IN 5 i a Input Terminals ps Mi E t j Output USB Socket abe Input Fuse p Sel dl gi pi Self Resetting o Fig 1 Top view 63mm 55mm Off O _ cea C3 LOO 4 x M3 Mounting holes drilled to 3 25mm Fig 2 Dimensions Page 2 of 4 Use Note that the module may become very warm during use especially with low input voltages and or high output currents This is normal but care should be taken to place it on a Suitable heat resistant and non conductive surface As with any electrical item of this type the module should be located out of reach of unsupervised children If fitting into an enclosure proper ventilation must be en2. may be reproduced in any form whether physically or electronically without prior written consent The Raspberry Pi name and the raspberry logo are trademarks of the Raspberry Pi Foundation have no affiliation with the Raspberry Pi Foundation Page 4of4
3. sured to prevent overheating Connection of the power source to the module is by means of the screw terminal block The polarity of the input voltage is unimportant due to the on board bridge rectifier The output of the module is via a standard USB Type A socket A small switch is located near the output socket which turns the module on and off When turned on an indicator LED next to the switch will glow Switched off the regulator IC is placed in standby mode and the module draws less than 7OUA A self resetting polyfuse is fitted adjacent to the input terminal to protect the power source from fault conditions on or beyond the module Also the regulator IC features internal current limiting circuitry and thermal shutdown for full protection from fault conditions Should a fault occur or the module stop functioning then remove power to the module before investigating the cause In the event that a fault has caused the polyfuse to trip removing the power for a few minutes will restore the fuse Check that the fault has been rectified before restoring power Specification Physical e Length 63mm 2 48in e Width 31mm 1 22in e Height 20mm 0 79in Electrical e Input Voltage 8 35V D C or 7 28V R M S A C e Output Voltage 5 Volts D C e Output Current Max 2 5A e No Load Current Drain lt 10mA e Standby Mode Current lt 70uA Page 3 of 4 LOD Circuit Surgery Circuit Surgery 2014 No part of this publication
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