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SP6642EB Datasheet(PDF) 3 Page - Sipex Corporation |
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SP6642EB Datasheet(HTML) 3 Page - Sipex Corporation |
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3 / 7 page  SP6642EB/03 SP6642/3 Evaluation Board Manual © Copyright 2000 Sipex Corporation 3 PFO – U1-3 – SP6642 or U1-4 – SP6643 Open Drain Power Fail Output. Sinks current when PFI falls below 0.614V. The SP6642EB has this pin pulled up to V OUT through 100kΩ resistor R5, which will draw 30 µA when power fail is asserted low. Evaluating Output Voltages Other than 3.3V FB – U1-5 – Connects to R1, R2 output feedback divider. The SP6642/3EB is set for 3.3V output since R1 is open on the board, and R2 shorts FB to GND. To set an output voltage in the range 2V to 5V, first cut the short on the board across R2, then connect surface mount resistors R1 & R2 according to the voltage divider equation: R1 = R2 (V OUT/VREF - 1) where R2 should be 100K to 1M since FB leakage = 10nA max and VREF = 1.25V Evaluating the SP6643 Circuit The SP6642EB comes with a SP6642EU installed. To evaluate a SP6643, you need to order samples of the SP6643EU and install one on the board. Instead of having the SHDN function, the SP6643 has a BATTLO function, which gives a low battery detection when the battery voltage drops below 1V. Be sure to remove the Shunt in J1 when using the SP6643. There are two pins on the SP6643 that differ from the SP6642, so note their use and label names differ as shown below: BATTLO – U1-3 Use the post labeled PFO. The BATTLO on the SP6643 is an Open Drain Battery-Low Output which is pulled up to V OUT by 100k Ω resistor R5. When the voltage at the BATT pin is less than 1V, BATTLO goes to close to 0V indicating Low Battery. PFO – U1-4 Use the post labeled SHDN. Remove the Shunt from J1. The PFO function on the SP6643 behaves the same as the SP6642 as described previously in the section “Using the Power Fail Comparator PFI”. |
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