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L6985F 数据表(PDF) 43 Page - STMicroelectronics |
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L6985F 数据表(HTML) 43 Page - STMicroelectronics |
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43 / 65 page  DocID027836 Rev 2 43/65 L6985F Application notes 65 6 Application notes 6.1 Output voltage adjustment The internal reference is equal to 0.85 V typical, and the output voltage is adjusted accordingly to Equation 40 (see Figure 32): Equation 40 where the Cr1 capacitor is sometimes useful to increase the small signal phase margin (please refer to Section 5.5: Compensation network design). Figure 32. L6985F application circuit 6.2 Switching frequency A resistor connected to the FSW pin features the selection of the switching frequency. The pinstrapping is performed at power-up, before the soft-start takes place. The FSW pin is pinstrapped and then driven floating in order to minimize the quiescent current from VIN. Please refer to Table 6: fSW selection on page 11 to identify the pull-up / pull-down resistor value. fSW = 250 kHz / fSW = 500 kHz preferred codifications don't require any external resistor. VOUT VREF 1 R1 R2 ------- + 0.85 1 R1 R2 ------- + = = |
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