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APW7290 Datasheet(PDF) 10 Page - Anpec Electronics Coropration |
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APW7290 Datasheet(HTML) 10 Page - Anpec Electronics Coropration |
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10 / 18 page  Copyright © ANPEC Electronics Corp. Rev. A.2 - Jun., 2013 www.anpec.com.tw 10 APW7290 Function Description (Cont.) Dropout Operation (Cont.) An important detail to remember is that on resistance of P-FET switch will increase at low input supply voltage. Therefore, the user should calculate the power dissipa- tion when the APW7290 is used at 100% duty cycle with low input voltage. Over-Temperature Protection (OTP) The over-temperature circuit limits the junction tempera- ture of the APW7290. When the junction temperature ex- ceeds 150oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool. The thermal sen- sor allows the converters to start a soft-start process and regulate the output voltage again after the junction tem- perature cools by 30oC. The OTP designed with a 30oC hysteresis lowers the average Junction Temperature (T J) during continuous thermal overload conditions, increas- ing the life time of the device. Short-Circuit Protection When the output is shorted to ground, the frequency of the oscillator is reduced to about 210 kHz, 1/7 of the nomi- nal frequency. This frequency fold back ensures that the inductor current has more time to decay, thereby prevent- ing runaway. The oscillator’s frequency will progressively increase to 1.5MHz when V FB or VOUT rises above 0V. Low Battery Detection The low battery detection is used to monitor the battery voltage and to generate a signal. This function includes two pins, LBI is the inverting input of the comparator and LBO is an open drain output (See Block Diagram). When the LBI voltage drops below the threshold voltage 0.6V, the open drain device will turn on and LBO becomes low. The Low battery threshold voltage can be programmed with a resistive divider from battery to LBI pin to the round. Since the LBO is an open drain output, it usually requires an external pull-up resistor. |
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