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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SCY99080CDWR2G датащи(PDF) 16 Page - ON Semiconductor |
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SCY99080CDWR2G датащи(HTML) 16 Page - ON Semiconductor |
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16 / 27 page  DDA002C http://onsemi.com 16 Voltage−Controlled Oscillator The VCO section features a high−speed circuitry allowing operation from 60 kHz up to 1 MHz. However, as there is an internal division by two, it creates Q and Q outputs. The final effective signal on the outputs Lgd, Hgd, Lgs and Hgs therefore switches between 30 kHz and 500 kHz. The VCO is configured in such a way that if the feedback pin voltage goes down, the switching frequency goes up. Figure 35 shows simplified architecture of the VCO. DT Vdd Vref Ct_DT S R Q Rfmin Vdd Vref Ct_ T_On Vdd 10 k Vdd FB R_Fmax FB_Fault To_FB_Fault_Timer Skip Dgs Vref Ct_Dgs Vdd On_time_clamp S R Q D CLK from internal logic DT A B To drivers SR_A SR_B To SR drivers Figure 35. Simplified VCO Architecture Vref = 2.5 V Vref_FB_Fault = 6 V Vref_DC_0 = 1.2 V Vref = 1.2 V Vref = 1.2 V Vref = 2.5 V Q Q Vref = 2.5 V The VCO conversion characteristic is shown in Figure 36. The FB fault is detected in case the feedback voltage is higher than 6 V. This will happen if the converter is overloaded or the feedback path is not closed i.e. a broken optocoupler. The internal fault timer starts to count once the FB fault is detected and it latches off the controller if the fault lasts more than 50 ms. To overcome triggering of the FB fault protection during the application start, the FB timer is disabled until the soft−start period ends (VSS > 1.9 V). |
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