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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC1112STRT датащи(PDF) 17 Page - Semtech Corporation |
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SC1112STRT датащи(HTML) 17 Page - Semtech Corporation |
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17 / 23 page  17 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC1112 Adjustable Output Voltage Option The adjustable output voltage option does not have an internal resistor divider. The adjust pin connects directly to the inverting input of the error amplifier, and the output voltage is set using external resistors (please refer to Figure 2). In this case, the adjust pin sources a nominal 0.5µA, so the resistor values should be selected to allow 50µA to flow through the divider. Again, a target value for RB (maximum) can be calculated: Ω ≤ A 50 V 200 . 1 RB µ The output voltage can be calculated as follows: RA A 5 . 0 RB RA 1 200 . 1 VOUT • − + • = µ The maximum output voltage that can be obtained from the adjustable option is determined by the input supply voltage and the R DS(ON) and gate threshold voltage of the external MOSFET. Assuming that the MOSFET gate threshold voltage is sufficiently low for the output voltage chosen and a worst-case drive voltage of 9V, V OUT(MAX) is given by: ) MAX )( ON ( DS ) MAX ( OUT ) MIN ( ) MAX ( OUT R I VTTIN V • − = Applications Infomation (Cont.) Figure 1: Adjusting The Output Voltage of VTT or AGP Q1 SC1112 PWRGD DELAY 5VSTBY VTTSEL AGPSEL GND FC CAP+ CAP- VTTGATE VTTSEN AGPGATE AGPSEN ADJGATE ADJSEN VTTIN C14 330u AGP SELECT Signal C8 330u AGP C17 0.1u C16 330u C3 0.1u C1 10u C18 330u VTT SELECT Signal +3.3V +5V STBY Q3 C9 0.1u VTT C19 330u C2 R1 R2 RA SC11 PWRGD DELAY 5VSTBY FC CAP+ CAP- ADJGATE ADJSEN Q2 C12 330u RB POWER GOOD C5 22n C10 1u C13 0.1u R1 1K C11 0.1u C6 330u VTT Figure 2 |
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