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GAQW5V020SMT Datasheet(PDF) 4 Page - Galaxy Power, Inc. |
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GAQW5V020SMT Datasheet(HTML) 4 Page - Galaxy Power, Inc. |
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4 / 7 page  GAQW5V020 – 4 WWW.GALAXYPWR.COM Part No. 02-GAQ-01 Rev. 3.0 – 041405 Galaxy Power Inc. 155 Flanders Road Westborough, MA 01581 Telephone: 508-870-9775 Fax: 508-870-9796 e-mail: info@galaxypwr.com RTRIM-UP= 5.0 (100+∆%) – (100+2∆%) 5.11kΩ 1.225∆% ∆% Output Over Voltage Protection: The output voltage is constantly monitored by the microprocessor with a redundant secondary-side measurement circuit that both shuts down the duty cycle and triggers the microprocessor to shut down. If the output voltage exceeds the over-voltage specifi- cation, the microprocessor will latch the converter off. To turn the converter on requires either cycling the ON/OFF pin or power to the converter. This ad- vanced feature prevents the converter from damaging the load if there is a converter failure or application error. If non-latching is required, consult factory. Thermal Shutdown: The printed circuit board temperature is measured using a semiconductor sensor. If the maximum rated temperature is exceeded, the converter is latched off. To re-enable the converter requires cycling the ON/ OFF pin or power to the converter. If non-latching is required, consult factory. Control Options: As the behavior of the circuit is determined by firmware in the microcontroller, specific customer requirements such as • non-latching thermal protection • custom valid input voltage range • controlled delay from initiating an ON/OFF signal for power sequencing can be accomplished with no change to hardware. The standard behavior was chosen based on system design experience but we understand that customers often have their own requirements. Please consult Galaxy Power for your special needs. Remote Sense: The output voltage is regulated at the point where the sense pins connect to the power output pins. Total sense compensation should not exceed 0.4V or 10% of Vout, whichever is greater. Safety: An external input fuse must always be used to meet these safety requirements. External Output Trimming Application Notes +Sense Trim –Sense Trim Up Trim Down 10KΩ Trimpot RTRIM-DOWN = 100 – 2 5.11kΩ ∆% { } Trim-up Trim-down { } Trim: To trim the output voltage higher, connect the required trim resistor from the Trim pin to the +Sense pin. To trim the output voltage lower, con- nect the required trim resistor from the Trim pin to the –Sense pin. Decrease in Output Voltage (%) 1000 100 10 0 1 23456 7 8 9 10 Trim-down Increase in Output Voltage (%) 10000 1000 100 0 1 23456 7 8 9 10 5.0V Trim-up |
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