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APL5606KI-TRL Datasheet(PDF) 10 Page - Anpec Electronics Coropration |
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APL5606KI-TRL Datasheet(HTML) 10 Page - Anpec Electronics Coropration |
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10 / 16 page  Copyright © ANPEC Electronics Corp. Rev. A.4 - Dec., 2010 www.anpec.com.tw 10 APL5606/A Function Description Under-Voltage Lock-Out (UVLO) The APL5606/A has a built-in under-voltage lock-out cir- cuit to keep the output off until the internal circuitry is operating properly. The UVLO function initiates a soft- start process after input voltage exceeds its rising UVLO threshold during power on. Typical UVLO threshold is 2.5V with 0.15V hysteresis. Soft-Start The APL5606/A provides an internal soft-start circuitry to control rise rate of the output voltage and limit the cur- rent surge during start-up. Approximate 20 µs delay time after the V IN is over the UVLO threshold, the IC starts a soft-start. The typical soft-start interval is about 130 µs. Adjustable/Full Speed Mode Selection The APL5606/A features an input pin to select one of the operation modes for DC fan speed control. In adjustable mode, the output voltage follows the 1.6 times of the volt- age on VSET pin to dynamically adjust the DC fan speed; in full speed mode, the internal P-channel MOSFET fully turns on to drive the DC fan with maximum supply voltage (V IN-VDROP) for full speed operation. Driving the FSM volt- age at high level(V FSM>1.6V) sets the IC to operate in ad- justable mode; driving the FSM at low level(V FSM<0.4V) sets the IC to operate in full speed mode. The FSM pin is internally pulled low in the APL5606 and is pulled high in the APL5605A. Current-Limit The APL5606/A provides a current-limit circuitry, which monitors the output current and controls P-MOS’s gate voltage to limit the output current at 700mA (min.). Foldback Current-Limit When the output voltage drops below 0.6V (typical), which is caused by overload or short-circuit, the foldback cur- rent-limit circuitry limits the output current to 250mA. The foldback circuit current-limit is used to reduce the power dissipation during short-circuit condition. The foldback current-limit is disabled for 0.6ms (typical) after the UVLO threshold is reached, therefore, the IC has normal 700mA (min.) current-limit level during start-up. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APL5606/A. When the junction temperature exceeds +150οC, the thermal shutdown circuitry disables the output, allowing the device to cool down. The output circuitry is enabled again after the junction tempera- ture cools down by 40οC, resulting in a pulsed output during continuous thermal overload conditions. The ther- mal 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 οC. |
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