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GHT5V040PHERGT003 Datasheet(PDF) 4 Page - Galaxy Power, Inc. |
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GHT5V040PHERGT003 Datasheet(HTML) 4 Page - Galaxy Power, Inc. |
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4 / 8 page  Taurus HC Series, Page 4 Part No. 01–001 Rev. 4.0_082803 WWW.GALAXYPWR.COM APPLICATION NOTES Output Over Voltage Protection: The output voltage is constantly monitored by the microprocessor and a redundant secondary side crowbar circuit that is set to a higher trip point than the microprocessor protection. If the output voltage exceeds the over-voltage specification, 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 advanced 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 shutdown 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. 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, connect the required trim resistor from the Trim pin to the –Sense pin. See diagram below. External Output Trimming + Sense Trim – Sense Trim-down (%) Trim-down Trim-up (for 3.3V) RTRIM-DOWN = 100 – 2 k Ω ∆% { } RTRIM-UP = Vo (100+ ∆%) – (100+ 2∆%) k Ω 1.225∆% ∆% { } |
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