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NCP370MUAITXG Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP370MUAITXG Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 11 page NCP370 http://onsemi.com 8 Negative Voltage and Reverse Current. The device protects the downstream side from negative voltage occurring on the IN pin, down to −28 V. When a negative voltage occurs, the output is disconnected from the IN pins. Reverse Mode In Reverse Mode, an external accessory plugged into the bottom connector can be powered by the internal battery of the system. To access to the reverse mode, DIR pin must be tied high (> 1.2) and REV must be tied high to low (< 0.55 V). In this case, the core of the NCP370 will be supplied by the battery, with a 2.5 V minimum voltage and 5.5 V maximum voltage. In this reverse state, both OCP and thermal modes are available. Overcurrent Protection (OCP) This device integrates the reverse over current protection function, from battery to external accessory. That means the current across the internal NMOS is limited when the value, set by the external Rlimit resistor, exceeds IOCP. An internal resistor is placed in series with the Ilim pin allowing a maximum OCP value when Ilim pin is directly connected to GND. By adding external resistors in series from Ilim to GND, the OCP value is lowered. See below table: Typical Current clamp table: Table 3. OVERCURRENT THRESHOLD SELECTION OCP RLIMIT (A) (kW) 1.6 0 1.0 14 0.5 70 During an overcurrent event, the N−MOSFETs turn off and FLAG output goes low, allowing the micro−controller to process the fault event and then disable reverse charge path. At power up (accessory is plugged on input pins), the current is limited up to Ilim for 1.2 ms (typical), to allow capacitor charge and limit inrush current. If the Ilim threshold is exceeded over 1.2 ms, the device enters OCP burst mode until the overcurrent event disappears. After 1 ms following the plug in of the accessory, the OCP mode is engaged. See Figure 5. tstartREV Figure 5. Overcurrent Protection Sequence Vin REV DIR FLAG Vout Ilim Drive Current in Accessory ID IREV Accessory ID Detection tREG tRRD tonREV |
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Similar Description - NCP370MUAITXG |
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