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AAT1230IRN-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT1230IRN-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
11 / 21 page AAT1230/1230-1 18V 100mA Step-Up Converter 1230.2006.10.1.4 11 The average diode current is equal to the output current. The average output current multiplied by the for- ward diode voltage determines the loss of the out- put diode. Diode junction temperature can be estimated. Output diode junction temperature should be maintained below 110ºC, but may vary depending on application and/or system guidelines. The diode θJA can be minimized with additional PCB area on the cathode. PCB heatsinking the anode may degrade EMI performance. The reverse leakage current of the rectifier must be considered to maintain low quiescent (input) cur- rent and high efficiency under light load. The recti- fier reverse current increases dramatically at high temperatures. Selecting the Boost Inductor The AAT1230/1230-1 controller utilizes hysteretic control and the switching frequency varies with output load and input voltage. The value of the inductor determines the maximum switching fre- quency of the AAT1230/1230-1 boost converter. Increased output inductance decreases the switch- ing frequency, resulting in higher peak currents and increased output voltage ripple. To maintain 2MHz maximum switching frequency and stable opera- tion, an output inductor sized from 1.5µH to 2.7µH is recommended. A better estimate of DMAX is possible when VF is known. Where VF is the Schottky diode forward voltage. If not known, it can be estimated at 0.5V. Manufacturer’s specifications list both the inductor DC current rating, which is a thermal limitation, and peak inductor current rating, which is determined by the saturation characteristics. Measurements at full load and high ambient temperature should be completed to ensure that the inductor does not sat- urate or exhibit excessive temperature rise. The output inductor (L) is selected to avoid satura- tion at minimum input voltage, maximum output load conditions. Peak current may be estimated using the following equation, assuming continuous con- duction mode. Worst-case peak current occurs at minimum input voltage (maximum duty cycle) and maximum load. Switching frequency can be estimat- ed from the curves and assumes a 2.2µH inductor. Output Current (mA) 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 40 50 60 70 80 90 100 VIN = 2.7V VOUT = 15V VIN = 2.7V VOUT = 18V VIN = 3.0V VOUT = 15V VIN = 3.0V VOUT = 18V VIN = 3.6V VOUT = 15V VIN = 3.6V VOUT = 18V (VOUT + VF - VIN(MIN)) (VOUT + VF) DMAX = TJ(DIODE) = TAMB + ΘJA · PLOSS(DIODE) PLOSS(DIODE) = IAVG(TOT) · VF = IOUT · VF IAVG(TOT) = IOUT Forward Voltage (V) 10 100 1000 10000 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 B340LA MBR0530 ZHCS350 BAT42W |
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