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APL5537CKCTI-TRG Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL5537CKCTI-TRG Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
9 / 16 page Copyright © ANPEC Electronics Corp. Rev. A.7 - Oct., 2011 www.anpec.com.tw 9 APL5537 Function Description VIN Under-Voltage Lockout (UVLO) The APL5537 has a built-in under-voltage lockout circuit to keep the outputs shuting off until internal circuitry is operating properly. The UVLO circuit has a hysteresis and a de-glitch feature so that it will typically ignore un- dershoot transients on the input . Soft-Start (For Each Channel) The APL5537 provides an internal soft-start circuitry to control rise rate of the output voltage and limit the current surge during start-up. The output voltage starts the soft- start at approximate 60 µs after the VIN is over the UVLO threshold. The typical soft-start interval is about 60 µs. Current-Limit Protection (For Each Channel) The APL5537 provides a current-limit protection function. During current limit, the device limits output current at current limit threshold. For reliable operation, the device should not be operated in current limit for extended period. Short-Circuit Current-Limit Protection (For Each Channel) When the output voltage drops below 0.8V, which is caused by the over load or short circuit, the device limits the output current down to a safe level. The short circuit current limit is used to reduce the power dissipation dur- ing short circuit conditions. If the junction temperature is over the over-temperature threshold, the device will enter the thermal shutdown. Enable/Disable (For Each Channel) Pulling the V EN1/2 above 1.5V enables the respective LDO output, and pulling V EN1/2 below 0.4V disables the respec- tive LDO output. When both the LDO outputs are disabled, the supply current is reduced to less than 1 µA. EN1/2 pins are internally pulled low by resistors. If shutdown function is not used, connect EN1/2 to VIN for normal operation. The enable inputs are compatible with both TTL and CMOS logic levels. Over-Temperature Protection An over-temperature protection circuitry limits the junc- tion temperature of APL5537. When the junction tempera- ture exceeds +160oC, the over-temperature protection circuitry disables the LDO outputs, allowing the device to cool down. The LDO outputs are enabled again after the junction temperature cools down by 40oC, resulting in a pulsed output during continuous thermal overload conditions. Over-temperature protection is designed to protect the IC in the event of over temperature conditions. For reliable operation, the junction temperature cannot exceed T J=+125 oC |
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