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APW707926DI-TRG Datasheet(PDF) 8 Page - Anpec Electronics Coropration |
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APW707926DI-TRG Datasheet(HTML) 8 Page - Anpec Electronics Coropration |
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8 / 16 page  Copyright © ANPEC Electronics Corp. Rev. A.4 - Jun., 2009 APW7079 www.anpec.com.tw 8 Function Description The over-temperature circuit limits the junction tempera- ture of the APW7079. When the junction temperature ex- ceeds 150 °C, a thermal sensor turns off the power MOSFETs, allowing the devices to cool. The thermal sen- sor allows the converter to start a start-up process and regulate the output voltage again after the junction tem- perature cools by 40 °C. The OTP is designed with a 40°C hysteresis to lower the average T J during continuous ther- mal overload conditions, increasing lifetime of the device. Control Scheme The converter monitors the output voltage. When the in- ternal feedback voltage falls below the reference voltage, the main switch turns on and the inductor current ramps up. The main switch turns off when the current reaches the peak current limit of typical 600mA. The second crite- rion that turns off the switch is the maximum on-time of 4 µs (typical). As the main switch is turned off, the syn- chronous switch is turned on and delivers the current to the output. The main switch remains off for a minimum of 900ns (typical), or until the internal feedback voltage drops below the reference voltage. By the control scheme with low quiescent current of 11 µA (typical), the converter gets high efficiency over a wide load range. Start-Up A startup oscillator circuit is integrated in the APW7079. When the power is applied to the device, the circuit pumps the output voltage high. Once the output voltage reaches 1.4V (typ), the main DC-DC circuitry turns on and boosts the output voltage to the final regulation point. Synchronous Rectification The internal synchronous rectifier eliminates the need for an external Schottky diode, thus, reducing cost and board space. During the cycle off-time, the P-channel MOSFET turns on and shunts the MOSFET body diode. As a result, the synchronous rectifier significantly improves efficiency without the addition of an external component. Conversion efficiency can be as high as 92%. Over-Temperature Protection |
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