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APL3534BBI-TRG Datasheet(PDF) 7 Page - Anpec Electronics Coropration |
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APL3534BBI-TRG Datasheet(HTML) 7 Page - Anpec Electronics Coropration |
7 / 14 page Copyright © ANPEC Electronics Corp. Rev. A.1 - Oct., 2013 APL3534/A/B www.anpec.com.tw 7 Function Description VIN Under-voltage Lockout (UVLO) The APL3534/A/B power switch has a built-in under-volt- age lockout circuit to keep the output shut off until internal circuitry is operating properly. The UVLO circuit has hys- teresis and a de-glitch feature so that it will typically ig- nore undershoot transients on the input. When input volt- age exceeds the UVLO threshold, the output voltage starts a soft-start to reduce the inrush current. Power Switch The power switch is an N-channel MOSFET with a low R DS(ON). The internal power MOSFET does not have the body diode. When IC is in UVLO state, the MOSFET pre- vents a current flowing from the VOUT back to VIN and VIN to VOUT. Current-Limit Protection The APL3534/A/B power switch provides the current-limit protection function. During current-limit, the devices limit output current at current-limit threshold. For reliable operation, the device should not be operated in current- limit for extended period time. Output Discharge When the input voltage is under VIN UVLO Threshold or V EN=Low or VENB=High, the output discharge device is turned on to discharge the output voltage. Soft-Start The APLA3534/A/B has a built-in output soft-start control to limit the current surge during start-up. The soft-start interval is 2.5ms. Short-Circuit Protection When the output voltage drops below 1.2V, which is caused by the over load or short-circuit, the devices limit the output current down to a safe level. The short-circuit current-limit is used to reduce the power dissipation dur- ing short-circuit condition. If the junction temperature is over the thermal shutdown temperature the device will enter the thermal shutdown. This Function is disabled during soft-start interval. Enable/Disable (SOT-23-5) Pulling the ENB above 2V or EN below 0.8V will disable the device, and pulling ENB pin below 0.8V or EN above 2V will enable the device. When the IC is disabled the supply current is reduced to less than 1 µA. The enable input is compatible with both TTL and CMOS logic levels. The EN/ENB pins cannot be left floating. Over-temperature Protection When the junction temperature exceeds 140 o C, 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 20 o C, 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- temperature conditions. For normal operation, the junc- tion temperature cannot exceed T J=+125 oC. Output Over-Voltage Protection The output over-voltage protection is implemented by 2 either sensing mechanisms. One is by sensing when V OUT voltage is above VOVP threshold, the internal power MOSFET is turned off. The other is by sensing when re- verse current, flowing from VOUT to VIN, surpasses I RV. When the reverse current reachers the reverse current Blocking threshold, the device limits the reveres current at I RV threshold level. When the reverse current fault ex- ists for more than 0.7ms, the internal power MOSFET is turned off. The internal power MOSFET is allowed to turn- on once the output voltage gose below V IN-1.2V. |
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