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MP62181DS Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP62181DS Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 12 page MP62180/MP62181 –CURRENT-LIMITED POWER DISTRIBUTION SWITCH MP62180_MP62181 Rev. 0.9 www.MonolithicPower.com 7 2/23/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. FUNCTION BLOCK DIAGRAM Vref Deglitch Logic Charge Pump GND *: EN is active high for MP62181; EN is active low for MP62180 Thermal Sense UVLO IN EN* FLAG OUT Current Sense AMP -- + + -- Figure2—Function Block Diagram DETAILED DESCRIPTION Over Current When the load exceeds trip current (minimum threshold current triggering constant-current mode) or a short is present, MP62180/MP62181 switches into to a constant-current mode (current limit value). MP62180/MP62181 will be shutdown only if the overcurrent condition stays long enough to trigger thermal protection. Trigger overcurrent protection for different overload conditions occurring in applications: 1) The output has been shorted or overloaded before the device is enabled or input applied. MP62180/MP62181 detects the short or overload and immediately switches into a constant-current mode. 2) A short or an overload occurs after the device is enabled. After the current-limit circuit has been tripped (reached the trip current threshold), the device switches into constant- current mode. However, high current may flow for a short period of time before the current-limit circuit can react. 3) Output current has been gradually increased beyond the recommended operating current. The load current rises until the trip current threshold is reached or until the thermal limit of the device is exceeded. The MP62180/MP62181 is capable of delivering current up to the trip current threshold without damaging the device. Once the trip threshold has been reached, the device switches into its constant-current mode. Flag Response The FLAG pin is an open drain configuration. This FAULT will report a fail mode after an 8ms deglitch timeout. This is used to ensure that no false fault signals are reported. This internal deglitch circuit eliminates the need for extend components. The FLAG pin is not deglitched during an over temp. or a voltage lockout. |
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