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NQ04T33VMA16 Datasheet(PDF) 19 Page - SynQor Worldwide Headquarters |
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NQ04T33VMA16 Datasheet(HTML) 19 Page - SynQor Worldwide Headquarters |
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19 / 20 page  For horizontal mount applications (NQ0xxxxHMA parts), where the inductor and power devices are facing down, the preferred airflow direction is into the leading edge opposite the pin header edge, such that air flowing under the NiQor PCB flows out between the pins and the inductor. With this airflow direction, and with the inductor firmly contacting the applica- tion board, the user can apply the thermal derating curves pro- vided herein (measured using 6 layer 2oz copper board) for vertical mount with airflow from pin 11 to pin 1. Airflows in other directions across the horizontally mounted NiQor will result in temperatures that are higher by about 5 OC with pin 11 to pin 1 airflow and about 10 OC with pin 1 to pin 11 airflow. Also, temperature increases of up to 10 OC (2 Amp lower der- ating) can be expected if the inductor thermal interface does not make good contact to the customer's circuit board. Layout Suggestion: When using a fixed output NiQor con- verter, the designer may chose to use the trim function and would thus be required to reserve board space for a trim resis- tor. It is suggested that even if the designer does not plan to use the trim function, additional space should be reserved on the board for a trim resistor. This will allow the flexibility to use the wide output voltage trim range NiQor module at a later date. Any trim resistor should connect to the ground or output node at one of the respective pins of the NiQor, so as to prevent the trim level from being affected by load drops through the ground or power planes. OPTIONAL FEATURES REMOTE SENSE(+) (Pin 3 - Optional): The optional SENSE(+) input corrects for voltage drops along the conductors that connect the converter’s output pins to the load. Pin 3 should be connected to Vout(+) at the point on the board where regulation is desired. A remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is Vout(+) – SENSE(+) < Sense Range % x Vout Pin 3 must be connected for proper regulation of the output volt- age. If these connections are not made, the converter will deliv- er an output voltage that is slightly higher than its specified value. Note: the output over-voltage protection circuit senses the volt- age across the output (pins 1, 2 and 4) to determine when it should trigger, not the voltage across the converter’s sense lead (pin 3). CURRENT SHARE (Pin A - Optional): Additional informa- tion on the current share feature will be provided in a future revision of this technical specification. Please contact SynQor engineering support for further details. Product # NQ04T33VMA16 Phone 1-888-567-9596 Doc.# 005-2NV4T3E Rev. B 7/6/04 Page 19 3.0 - 5.5Vin 16A Non-Isolated Non-Isolated SIP Converter SIP Converter Product#NQ04T33VMA16 Phone1-888-567-9596 www.synqor.com Doc.#005-2NV4T3E Rev.C 03/22/2010 Page19 |
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