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AS1326B-BTDR Datasheet(PDF) 11 Page - ams AG |
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AS1326B-BTDR Datasheet(HTML) 11 Page - ams AG |
11 / 18 page www.austriamicrosystems.com Revision 1.02 11 - 18 AS1326 Data Sheet - A p p l i c a t i o n I n f o r m a t i o n 9 Application Information Figure 19. Typical AS1326A Application Circuit Setting the Output Voltages For a fixed 3.3V output, connect pin FB to GND. To set adjustable output voltages between 2.5 and 5.0V, connect a resistor voltage-divider to pin FB from pin OUT to GND (Figure 20). Figure 20. Application Circuit using External Feedback Resistors For the circuit shown in Figure 20, the input bias current into FB is <20nA, permitting large-value resistor-divider net- works while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a ≤ 270kΩ resistor for R2, then calculate R1 as: Where: VFB (the boost-regulator feedback set point) is 1.24V. 10Ω 9 POUT 10nF 33µF AS1326A 10 ONN 6 CLK/SEL 1 ISET 2 REF 4 FB 3 GND 7 PGND 8 LX 3.3µH + VIN = 2.4V 5 OUT 100µF + 330nF VOUT = 3.3V 800mA 10Ω 9 POUT 10nF 33µF AS1326A 10 ONN 6 CLK/SEL 1 ISET 2 REF 3 GND 7 PGND 8 LX 3.3µH + VIN = 2.4V 5 OUT 100µF + 330nF VOUT R1 R2 4 FB (EQ 1) R1 R2 VOUT VFB -------------- 1 – ⎝⎠ ⎛⎞ ⋅ = |
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