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AME5296 Fiches technique(PDF) 9 Page - Analog Microelectronics |
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AME5296 Fiches technique(HTML) 9 Page - Analog Microelectronics |
9 / 14 page AME 9 AME5296 Rev. A.05 2A, 18V, 500KHz Synchronous StepDownDC/DC Converter When using tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be approximated to: Setting the Output Voltage The output voltage is using a resistive voltage divider connected from the output voltage to feedback pin. It divides the output voltage down to the feedback voltage by the ratio: The output voltage is: ESR IN OUT OUT OUT R V V 1 L f V V × − × × = 2 1 2 OUT FB R R R V V + × = 2 2 1 OUT R R R 8 . 0 V + × = n Typical Application Circuits VOUT(V) R1(K Ω) R2(K Ω) R3(K Ω) L( µH) CIN(µF) COUT(µF) 1.0 20.5 82.0 82 1.5 22 22x2 1.2 30.1 60.4 82 1.5 22 22x2 1.8 40.2 32.4 56 2.2 22 22x2 2.5 40.2 19.1 33 3.3 22 22x2 3.3 40.2 12.7 33 4.7 22 22x2 5.0 40.2 7.68 33 6.8 22 22x2 VCC BST IN FB SS EN SW GND AME5296 C3 1uF Ren2 10K C6 15pF R5 0 Ω C4 0.1uF R4 10 Ω Ren1 18K CIN2 NS CIN1 22uF C5 22nF L1 4.7uH R1 40.2K R3 33K R2 12.7K COUT1 22uF COUT2 22uF VIN 4.5V~18V VOUT 3.3V/2A |
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