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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MIC2182 датащи(PDF) 15 Page - Microchip Technology |
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MIC2182 датащи(HTML) 15 Page - Microchip Technology |
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15 / 40 page  2022 Microchip Technology Inc. and its subsidiaries DS20006644A-page 15 MIC2182 FIGURE 4-3: PWM-Mode Timing. FIGURE 4-4: Skip-Mode Timing. A hysteretic comparator is used in place of the PWM error amplifier and a current-limit comparator senses the inductor current. A one-shot starts the switching cycle by momentarily turning on the low side MOSFET to insure the high-side drive boost capacitor, CBST, is fully charged. The high-side MOSFET is turned on and current ramps up in the inductor, L1. The high-side drive is turned off when either the peak voltage on the input of the current-sense comparator exceeds the threshold, typically 35 mV, or the output voltage rises above the hysteretic threshold of the output voltage comparator. Once the high-side MOSFET is turned off, the load current discharges the output capacitor, causing VOUT to fall. The cycle repeats when VOUT falls below the lower threshold, –1%. The maximum peak inductor current in Skip Mode depends on the skip-mode current-limit threshold and the value of the current-sense resistor, RCS. EQUATION 4-1: Figure 4-5 shows the improvement in efficiency that skip mode makes at lower output currents. VDD 0V 0V 0V 0V 0A VDD VIN + VDD VIN VSW Reset Pulse VHSD VLSD ILOAD IL1 0V 0V 0V 0A VDD +1% –1% VNOMINAL VIN VOUT VSW VLSD VHSD Vone-shot 0V VDD 0V VDD IL(PKMAX)_SKIP IL1 VOUT IOUT 0A IL(PKMAX)_SKIP 35mV RCS -------------- = |
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