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ST2S08BPQR bảng dữ liệu(PDF) 11 Page - STMicroelectronics |
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11 / 18 page ST2S08B Application information Doc ID 18290 Rev 2 11/18 8 Application information 8.1 Introduction The following technical information is used for estimating typical external component characteristics using standard equations. Nevertheless, it is strongly recommended to validate the suitability of external components to the application requirements by thoroughly testing any solution at bench level on a real evaluation circuit. 8.2 Programming the output voltage The output voltage for both channels can be adjusted from 0.8 V up to 85 % of the input voltage value by connecting a resistor divider between VO and GND, the middle point of the divider must be connected to the feedback (FB) pin, as shown in Figure 3. The resistor divider must be chosen according to the following equations: Equation 1 Equation 2 Using a resistor with a value in the range of 1 k Ω to 50 kΩ is recommended. Lower values are also suitable, but increase current consumption. 8.3 Inductor selection The inductor is the key passive component for switching converters. The critical inductance values can then be obtained according to the following formulas: Equation 3 FSW = switching frequency ΔIL = the peak-to-peak inductor ripple current. As a rule of thumb, the peak-to-peak ripple can be set at 20 % - 40 % of the output current. The peak current of the inductor can be calculated as: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + × = 2 R 1 R 1 V V 1 FB 1 O ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + × = 4 R 3 R 1 V V 2 FB 2 O L SW MAX _ IN O MAX _ IN O MIN I F V ) V V ( V L Δ × × − × = |
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