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AAT1230IRN Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT1230IRN Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 21 page  AAT1230/1230-1 18V 100mA Step-Up Converter 10 1230.2007.06.1.6 Application Information Selecting the Output Diode To ensure minimum forward voltage drop and no recovery, high voltage Schottky diodes are consid- ered the best choice for the AAT1230/1230-1 boost converter. The AAT1230/1230-1 output diode is sized to maintain acceptable efficiency and reason- able operating junction temperature under full load operating conditions. Forward voltage (V F) and package thermal resistance ( θ JA) are the dominant factors to consider in selecting a diode. The diode's published current rating may not reflect actual oper- ating conditions and should be used only as a com- parative measure between similarly rated devices. 20V rated Schottky diodes are recommended for outputs less than 15V, while 30V rated Schottky diodes are recommended for outputs greater than 15V. The switching period is divided between ON and OFF time intervals. During the ON time, the N-channel power MOS- FET is conducting and storing energy in the boost inductor. During the OFF time, the N-channel power MOSFET is not conducting. Stored energy is transferred from the input battery and boost induc- tor to the output load through the output diode. Duty cycle is defined as the ON time divided by the total switching interval. The maximum duty cycle can be estimated from the relationship for a continuous mode boost con- verter. Maximum duty cycle (D MAX) is the duty cycle at minimum input voltage (V IN(MIN)). The average diode current during the OFF time can be estimated. The following curves show the V F characteristics for different Schottky diodes (100°C case). The V F of the Schottky diode can be estimated from the average current during the off time. = TON + TOFF 1 FS TON TON + TOFF D = = TON ⋅ FS VOUT - VIN(MIN) VOUT DMAX = IOUT 1 - DMAX IAVG(OFF) = Figure 1: AAT1230/1230-1 Demo Board Schematic. LIN 12 FB1 11 FB2 10 GND 9 PGND 8 SW 7 SW 6 N/C 5 VIN 4 SEL 3 EN/SET 2 VP 1 U1 1 2 3 JP1 1 2 3 JP2 VIN U1 AAT1230/1230-1 TSOPJW12 C1 10V 0603 2.2μF C2 25V 0805 2.2μF D1 30V 0.5A MBR0530T1 SOD-123 L1 2.2μH SD3814-2R2 R1 78.7k 0603 R2 562 0603 R3 4.99k 0603 R4 10k 0603 L1 2.2μH D1 Schottky R1 78.7k C2 2.2μF C1 2.2μF VOUT R2 562 R3 4.99k R4 10K Select Enable |
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