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IR3651SPBF Datasheet(PDF) 12 Page - International Rectifier |
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IR3651SPBF Datasheet(HTML) 12 Page - International Rectifier |
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12 / 19 page  IR3651SPbF 10/11/2006 Application Information Output Voltage Programming Output voltage is programmed by reference voltage and external voltage divider. The Fb pin is the inverting input of the error amplifier, which is internally referenced to 1.25V. The divider is ratioed to provide 1.25V at the Fb pin when the output is at its desired value. The output voltage is defined by using the following equation: When an external resistor divider is connected to the output as shown in figure 9. Equation (4) can be rewritten as: For the calculated values of R 8 and R 9 see feedback compensation section. ) 4 --( R R 1 V V 9 8 ref o ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ∗ = Fig. 9: Typical application of the IR3651 for programming the output voltage ) 5 --( V V V R R ref O ref 8 9 ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − ∗ = Soft-Start Programming The soft-start timing can be programmed by selecting the soft-start capacitance value. The start-up time of the converter can be calculated by using: Where T start is the desired start-up time (ms) For a start-up time of 5ms, the soft-start capacitor will be 0.1uF. Choose a ceramic capacitor at 0.1uF. ) 1 --( T A 20 C start SS * µ ≅ Fb IR3651 VOUT R9 R8 12 |
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