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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6675 датащи(PDF) 40 Page - STMicroelectronics |
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PM6675 датащи(HTML) 40 Page - STMicroelectronics |
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40 / 47 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Application information PM6675 40/47 7.1.6 VDDQ current limit setting The valley current limit is set by RCSNS and must be chosen to support the maximum load current. The valley of the inductor current ILvalley is: Equation 46 The output current limit depends on the current ripple as shown in Figure 20: Figure 20. Valley current limit waveforms As the valley threshold is fixed, the greater the current ripple, the greater the DC output current will be. If an output current limit greater than ILOAD(max) over all the input voltage range is required, the minimum current ripple must be considered in the previous formula. Then the resistor RCSNS is: Equation 47 where RDSon is the drain-source on-resistance of the low-side switch. Consider the temperature effect and the worst case value in RDSon calculation (typically +0.4%/°C). The accuracy of the valley current also depends on the offset of the internal comparator (±5mV). The negative valley-current limit (if the device works in forced-PWM mode) is given by: Equation 48 2 I (max) I I L LOAD Lvalley ∆ − = Inductor current Valley current limit MAX LOAD 1 MAX LOAD 2 Inductor current Current Time uA 100 I R R Lvalley DSon CSNS ⋅ = DSon NEG R mV 120 I = |
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