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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6681ATR датащи(PDF) 19 Page - STMicroelectronics |
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PM6681ATR датащи(HTML) 19 Page - STMicroelectronics |
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19 / 47 page  PM6681A Device description 19/47 Figure 30. Constant on time PWM control The duty cycle of the buck converter in steady state is: Equation 2 The PWM control works at a nearly fixed frequency fSW: Equation 3 As mentioned the steady state switching frequency is theoretically independent from battery voltage and from output voltage. Actually the frequency depends on parasitic voltage drops that are present during the charging path (high side switch resistance, inductor resistance (DCR) and discharging path (low side switch resistance, DCR). As a result the switching frequency increases as a function of the load current. Standard switching frequency values can be selected for both sections by connecting pin FSEL to SGND, VREF or LDO5 pin. The following table shows the typical switching frequencies that can be obtained as a function of the programmed output voltage. The measures are referred to switching sections with 2 A load, 12 V input voltage and working in continuous conduction mode. Table 7. FSEL pin selection: typical switching frequency Fsw @ OUT1 = 1.5 V (kHz) Fsw @ OUT2 = 1.05 V (kHz) FSEL = GND 200 325 FSEL = VREF 290 425 FSEL = LDO5 390 590 Vin Vout D = on on on sw K 1 Vin Vout K Vin Vout T D f = × = = |
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