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APL3203D Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APL3203D Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
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11 / 19 page  Copyright © ANPEC Electronics Corp. Rev. A.6 - Mar., 2013 www.anpec.com.tw 11 APL3203D The output current is monitored by the internal OCP circuit. When the output current reaches the OCP threshold, the device limits the output current at OCP threshold level. If the OCP condition continues for a blanking time of T B(OCP), the internal power FET is turned off. After the recovery time of T ON(OCP), the FET will be turned on again and the output current is monitored again. The APL3203D has have a built-in counter. When the total count of OCP fault reaches 16, the FET is turned off permanently, requiring either a V IN POR or EN re-enable again to restart. The OCP threshold is programmed by a resistor R ILIM con- nected from ILIM pin to GND. The OCP threshold is cal- culated by the following equation: The APL3203D provides an open-drain output to indicate that a fault has occurred. When any of input OVP, OCP, battery OVP, is detected, the FAULT goes low to indicate that a fault has occurred. Since the FAULT pin is an open- drain output, connecting a resistor to a pull high voltage is necessary. Enable/Shutdown Pull the EN pin voltage above 1.4V to disable the device and pull EN pin voltage below 0.4V to enable the device. The EN pin has an internal pull-down resistor and can be left floating. When the IC is latched off due to the total count of OCP or battery OVP reaches 16, disable and re- enable the device with the EN pin can clear the counter. Over-Temperature Protection When the junction temperature exceeds 140οC, the inter- nal thermal sense circuit turns off the power FET and allows the device to cool down. When the device’s junc- tion temperature cools by 20οC, the internal thermal sense circuit will enable the device, resulting in a pulsed output during continuous thermal protection. Thermal protec- tion is designed to protect the IC in the event of over tem- perature conditions. For normal operation, the junction temperature cannot exceed T J=+125 οC. The APL3203D monitors the BAT pin voltage for battery over-voltage protection. The battery OVP threshold is in- ternally set to 4.435V. When the BAT pin voltage exceeds the battery OVP threshold for a blanking time of T B(BOVP), Battery Over-Voltage Protection Function Description Power-Up The APL3203D has a built-in power-on-reset circuit to keep the output shutting off until internal circuitry is oper- ating properly. The POR circuit has hysteresis and a de- glitch feature so that it will typically ignore undershoot transients on the input. When input voltage exceeds the POR threshold and after 8ms blanking time, the output voltage starts a soft-start to reduce the inrush current. ILIM ILIM OCP R K I = Over-Current Protection (OCP) Input Over-Voltage Protection (OVP) The input voltage is monitored by the internal OVP circuit. When the input voltage rises above the input OVP threshold, the internal FET will be turned off within 1 µs to protect connected system on OUT pin. When the input voltage returns below the input OVP threshold minus the hysteresis, the FET is turned on again after 8ms recovery time. The input OVP circuit has a 200mV hysteresis and a recovery time of T ON(OVP) to provide noise immunity against transient conditions. the internal power FET is turned off. When the BP voltage returns below the battery OVP threshold minus the hysteresis, the FET is turned on again. The APL3203D has a built-in counter. When the total count of battery OVP fault reaches 16, the FET is turned off permanently, re- quiring either a V IN POR or EN re-enable again to restart. FAULTOutput where K ILIM=25000AΩ |
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