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RT9554A Fiches technique(PDF) 2 Page - Richtek Technology Corporation |
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RT9554A Fiches technique(HTML) 2 Page - Richtek Technology Corporation |
2 / 10 page RT9554A 2 DS9554A-00 June 2014 www.richtek.com © Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Functional Pin Description Function Block Diagram Operation The RT9554A consists of one current sensing amplifier and one comparator, and it provides the following functions : over-current protection and voltage comparison between AC_REAL and AC_REF. Users can connect one resistor between the FLAG pin and supply voltage. Either over-current condition or the occurs AC_REAL voltage is larger than AC_REF, the FLAG pin is pulled low. Over Current Protection With 1m Ω order of resistor shunts between CSP and CSN, the current sensing amplifier amplifies the voltage between CSP and CSN by 200 and compares the result with the BAT_REF voltage. If the output voltage of current sensing amplifier is larger than the BAT_REF voltage, the FLAG pin is pulled low. AC_REAL & AC_REF Comparison A comparator is designed for the voltage comparison between AC_REAL and AC_REF. If the voltage of AC_REAL is larger than AC_REF, the FLAG pin is pulled low. POR GND Comparator + - + - Comparator + - VRON AC_REAL BAT_REF CSN CSP VCC EN x 200 FLAG AC_REF Pin No. Pin Name Pin Function 1 VCC Power Supply Input. Connect this pin to 5V and place a minimum 0.1 F decoupling capacitor .The decoupling capacitor should be placed to this pin as close as possible. 2 EN Enable Control Input. 3 FLAG Open-Drain Output. Connected to an external resistor. When over-current occurs, this pin will be pulled low. 4 AC_REF Comparator Inverting Input. 5 AC_REAL Comparator Non-Inverting Input. 6 BAT_REF Over-Current Threshold Setting. It is used to set over-current threshold from 0.4V to 2V. 7 CSN Negative Current Sense Input. 8 CSP Positive Current Sense Input. 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation |
Numéro de pièce similaire - RT9554A |
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Description similaire - RT9554A |
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